6trd

Cryo- EM structure of the Thermosynechococcus elongatus photosystem I in the presence of cytochrome c6

Method: ELECTRON MICROSCOPY

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1. Protein Identity and Related Structures Protein Identity & Related Structures

Photosystem I P700 chlorophyll a apoprotein A1

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A2 × 3 （P0A407） Photosystem I iron-sulfur center × 3 （P0A415） Photosystem I reaction center subunit II × 3 （P0A420） Photosystem I reaction center subunit IV × 3 （P0A423） Photosystem I reaction center subunit III × 3 （P0A401） Photosystem I reaction center subunit VIII × 3 （P0A427） Photosystem I reaction center subunit IX × 3 （P0A429） Photosystem I reaction center subunit PsaK × 3 （P0A425） Photosystem I reaction center subunit XI × 3 （Q8DGB4） Photosystem I reaction center subunit XII × 3 （P0A403） Photosystem I 4.8K protein × 3 （Q8DKP6） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAA_THEEB
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain 1； PDBConstruct 1–755； UniProt 1–755 Author chain A； PDBConstruct 1–755； UniProt 1–755 Author chain a； PDBConstruct 1–755； UniProt 1–755

Photosystem I P700 chlorophyll a apoprotein A2

OrganismNot specified

UniProt P0A407

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A1 × 3 （P0A405） Photosystem I iron-sulfur center × 3 （P0A415） Photosystem I reaction center subunit II × 3 （P0A420） Photosystem I reaction center subunit IV × 3 （P0A423） Photosystem I reaction center subunit III × 3 （P0A401） Photosystem I reaction center subunit VIII × 3 （P0A427） Photosystem I reaction center subunit IX × 3 （P0A429） Photosystem I reaction center subunit PsaK × 3 （P0A425） Photosystem I reaction center subunit XI × 3 （Q8DGB4） Photosystem I reaction center subunit XII × 3 （P0A403） Photosystem I 4.8K protein × 3 （Q8DKP6） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAB_THEEB
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain 2； PDBConstruct 1–741； UniProt 1–741 Author chain B； PDBConstruct 1–741； UniProt 1–741 Author chain b； PDBConstruct 1–741； UniProt 1–741

Photosystem I iron-sulfur center

OrganismNot specified

UniProt P0A415

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A1 × 3 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 3 （P0A407） Photosystem I reaction center subunit II × 3 （P0A420） Photosystem I reaction center subunit IV × 3 （P0A423） Photosystem I reaction center subunit III × 3 （P0A401） Photosystem I reaction center subunit VIII × 3 （P0A427） Photosystem I reaction center subunit IX × 3 （P0A429） Photosystem I reaction center subunit PsaK × 3 （P0A425） Photosystem I reaction center subunit XI × 3 （Q8DGB4） Photosystem I reaction center subunit XII × 3 （P0A403） Photosystem I 4.8K protein × 3 （Q8DKP6） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAC_THEEB
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain 3； PDBConstruct 1–81； UniProt 1–81 Author chain C； PDBConstruct 1–81； UniProt 1–81 Author chain c； PDBConstruct 1–81； UniProt 1–81

Photosystem I reaction center subunit II

OrganismNot specified

UniProt P0A420

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A1 × 3 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 3 （P0A407） Photosystem I iron-sulfur center × 3 （P0A415） Photosystem I reaction center subunit IV × 3 （P0A423） Photosystem I reaction center subunit III × 3 （P0A401） Photosystem I reaction center subunit VIII × 3 （P0A427） Photosystem I reaction center subunit IX × 3 （P0A429） Photosystem I reaction center subunit PsaK × 3 （P0A425） Photosystem I reaction center subunit XI × 3 （Q8DGB4） Photosystem I reaction center subunit XII × 3 （P0A403） Photosystem I 4.8K protein × 3 （Q8DKP6） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAD_THEEB
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain 4； PDBConstruct 1–139； UniProt 1–139 Author chain D； PDBConstruct 1–139； UniProt 1–139 Author chain d； PDBConstruct 1–139； UniProt 1–139

Photosystem I reaction center subunit IV

OrganismNot specified

UniProt P0A423

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A1 × 3 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 3 （P0A407） Photosystem I iron-sulfur center × 3 （P0A415） Photosystem I reaction center subunit II × 3 （P0A420） Photosystem I reaction center subunit III × 3 （P0A401） Photosystem I reaction center subunit VIII × 3 （P0A427） Photosystem I reaction center subunit IX × 3 （P0A429） Photosystem I reaction center subunit PsaK × 3 （P0A425） Photosystem I reaction center subunit XI × 3 （Q8DGB4） Photosystem I reaction center subunit XII × 3 （P0A403） Photosystem I 4.8K protein × 3 （Q8DKP6） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAE_THEEB
Isoform	—
PDB entities	5
Chains and sequence ranges	Author chain 5； PDBConstruct 1–76； UniProt 1–76 Author chain E； PDBConstruct 1–76； UniProt 1–76 Author chain e； PDBConstruct 1–76； UniProt 1–76

Photosystem I reaction center subunit III

OrganismNot specified

UniProt P0A401

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A1 × 3 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 3 （P0A407） Photosystem I iron-sulfur center × 3 （P0A415） Photosystem I reaction center subunit II × 3 （P0A420） Photosystem I reaction center subunit IV × 3 （P0A423） Photosystem I reaction center subunit VIII × 3 （P0A427） Photosystem I reaction center subunit IX × 3 （P0A429） Photosystem I reaction center subunit PsaK × 3 （P0A425） Photosystem I reaction center subunit XI × 3 （Q8DGB4） Photosystem I reaction center subunit XII × 3 （P0A403） Photosystem I 4.8K protein × 3 （Q8DKP6） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAF_THEEB
Isoform	—
PDB entities	6
Chains and sequence ranges	Author chain 6； PDBConstruct 1–141； UniProt 24–164 Author chain F； PDBConstruct 1–141； UniProt 24–164 Author chain f； PDBConstruct 1–141； UniProt 24–164

Photosystem I reaction center subunit VIII

OrganismNot specified

UniProt P0A427

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A1 × 3 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 3 （P0A407） Photosystem I iron-sulfur center × 3 （P0A415） Photosystem I reaction center subunit II × 3 （P0A420） Photosystem I reaction center subunit IV × 3 （P0A423） Photosystem I reaction center subunit III × 3 （P0A401） Photosystem I reaction center subunit IX × 3 （P0A429） Photosystem I reaction center subunit PsaK × 3 （P0A425） Photosystem I reaction center subunit XI × 3 （Q8DGB4） Photosystem I reaction center subunit XII × 3 （P0A403） Photosystem I 4.8K protein × 3 （Q8DKP6） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAI_THEEB
Isoform	—
PDB entities	7
Chains and sequence ranges	Author chain 7； PDBConstruct 1–38； UniProt 1–38 Author chain I； PDBConstruct 1–38； UniProt 1–38 Author chain i； PDBConstruct 1–38； UniProt 1–38

Photosystem I reaction center subunit IX

OrganismNot specified

UniProt P0A429

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A1 × 3 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 3 （P0A407） Photosystem I iron-sulfur center × 3 （P0A415） Photosystem I reaction center subunit II × 3 （P0A420） Photosystem I reaction center subunit IV × 3 （P0A423） Photosystem I reaction center subunit III × 3 （P0A401） Photosystem I reaction center subunit VIII × 3 （P0A427） Photosystem I reaction center subunit PsaK × 3 （P0A425） Photosystem I reaction center subunit XI × 3 （Q8DGB4） Photosystem I reaction center subunit XII × 3 （P0A403） Photosystem I 4.8K protein × 3 （Q8DKP6） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAJ_THEEB
Isoform	—
PDB entities	8
Chains and sequence ranges	Author chain 8； PDBConstruct 1–41； UniProt 1–41 Author chain J； PDBConstruct 1–41； UniProt 1–41 Author chain j； PDBConstruct 1–41； UniProt 1–41

Photosystem I reaction center subunit PsaK

OrganismNot specified

UniProt P0A425

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A1 × 3 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 3 （P0A407） Photosystem I iron-sulfur center × 3 （P0A415） Photosystem I reaction center subunit II × 3 （P0A420） Photosystem I reaction center subunit IV × 3 （P0A423） Photosystem I reaction center subunit III × 3 （P0A401） Photosystem I reaction center subunit VIII × 3 （P0A427） Photosystem I reaction center subunit IX × 3 （P0A429） Photosystem I reaction center subunit XI × 3 （Q8DGB4） Photosystem I reaction center subunit XII × 3 （P0A403） Photosystem I 4.8K protein × 3 （Q8DKP6） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAK_THEEB
Isoform	—
PDB entities	9
Chains and sequence ranges	Author chain 9； PDBConstruct 1–83； UniProt 1–83 Author chain K； PDBConstruct 1–83； UniProt 1–83 Author chain k； PDBConstruct 1–83； UniProt 1–83

Photosystem I reaction center subunit XI

OrganismNot specified

UniProt Q8DGB4

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A1 × 3 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 3 （P0A407） Photosystem I iron-sulfur center × 3 （P0A415） Photosystem I reaction center subunit II × 3 （P0A420） Photosystem I reaction center subunit IV × 3 （P0A423） Photosystem I reaction center subunit III × 3 （P0A401） Photosystem I reaction center subunit VIII × 3 （P0A427） Photosystem I reaction center subunit IX × 3 （P0A429） Photosystem I reaction center subunit PsaK × 3 （P0A425） Photosystem I reaction center subunit XII × 3 （P0A403） Photosystem I 4.8K protein × 3 （Q8DKP6） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAL_THEEB
Isoform	—
PDB entities	10
Chains and sequence ranges	Author chain 0； PDBConstruct 1–155； UniProt 1–155 Author chain L； PDBConstruct 1–155； UniProt 1–155 Author chain l； PDBConstruct 1–155； UniProt 1–155

Photosystem I reaction center subunit XII

OrganismNot specified

UniProt P0A403

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A1 × 3 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 3 （P0A407） Photosystem I iron-sulfur center × 3 （P0A415） Photosystem I reaction center subunit II × 3 （P0A420） Photosystem I reaction center subunit IV × 3 （P0A423） Photosystem I reaction center subunit III × 3 （P0A401） Photosystem I reaction center subunit VIII × 3 （P0A427） Photosystem I reaction center subunit IX × 3 （P0A429） Photosystem I reaction center subunit PsaK × 3 （P0A425） Photosystem I reaction center subunit XI × 3 （Q8DGB4） Photosystem I 4.8K protein × 3 （Q8DKP6） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAM_THEEB
Isoform	—
PDB entities	11
Chains and sequence ranges	Author chain M； PDBConstruct 1–31； UniProt 1–31 Author chain m； PDBConstruct 1–31； UniProt 1–31 Author chain y； PDBConstruct 1–31； UniProt 1–31

Photosystem I 4.8K protein

OrganismNot specified

UniProt Q8DKP6

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 36	Photosystem I P700 chlorophyll a apoprotein A1 × 3 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 3 （P0A407） Photosystem I iron-sulfur center × 3 （P0A415） Photosystem I reaction center subunit II × 3 （P0A420） Photosystem I reaction center subunit IV × 3 （P0A423） Photosystem I reaction center subunit III × 3 （P0A401） Photosystem I reaction center subunit VIII × 3 （P0A427） Photosystem I reaction center subunit IX × 3 （P0A429） Photosystem I reaction center subunit PsaK × 3 （P0A425） Photosystem I reaction center subunit XI × 3 （Q8DGB4） Photosystem I reaction center subunit XII × 3 （P0A403） CHLOROPHYLL A ISOMER × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 72 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 15 CALCIUM ION × 6 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 water × 18	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q8DKP6_THEEB
Isoform	—
PDB entities	12
Chains and sequence ranges	Author chain X； PDBConstruct 1–36； UniProt 4–39 Author chain x； PDBConstruct 1–36； UniProt 4–39 Author chain z； PDBConstruct 1–36； UniProt 4–39

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	6trd
Deposition date deposition_date	2019-12-18
Structure title title	Cryo- EM structure of the Thermosynechococcus elongatus photosystem I in the presence of cytochrome c6
Keywords keywords	Photosystem I, P700, Cyanobacteria, PHOTOSYNTHESIS; PHOTOSYNTHESIS
Experimental Method method	ELECTRON MICROSCOPY

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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

6trd__assembly_1__model_1

Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

6trd__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

6trd__assembly_1__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	69.27 Å
Rg (electron density)	68.72 Å
Total Rg	68.65 Å
Atom count	74940
Residues	6843
Excluded volume	1409400 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`6trd__assembly_1__model_1`	36-meric （36）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (21)

Entity 1 Entity 1 polymer

Description description	Photosystem I P700 chlorophyll a apoprotein A1
Molecular weight formula_weight	83267.8 kDa
EC 编号 ec_number	1.97.1.12
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,a,1
Atom count atom_count	74991

MTISPPEREPKVRVVVDNDPVPTSFEKWAKPGHFDRTLARGPQTTTWIWNLHALAHDFDTHTSDLEDISRKIFSAHFGHLAVVFIWLSGMYFHGAKFSNYEAWLADPTGIKPSAQVVWPIVGQGILNGDVGGGFHGIQITSGLFQLWRASGITNEFQLYCTAIGGLVMAGLMLFAGWFHYHKRAPKLEWFQNVESMLNHHLAGLLGLGSLAWAGHQIHVSLPINKLLDAGVAAKDIPLPHEFILNPSLMAELYPKVDWGFFSGVIPFFTFNWAAYSDFLTFNGGLNPVTGGLWLSDTAHHHLAIAVLFIIAGHMYRTNWGIGHSLKEILEAHKGPFTGAGHKGLYEVLTTSWHAQLAINLAMMGSLSIIVAQHMYAMPPYPYLATDYPTQLSLFTHHMWIGGFLVVGGAAHGAIFMVRDYDPAMNQNNVLDRVLRHRDAIISHLNWVCIFLGFHSFGLYVHNDTMRAFGRPQDMFSDTGIQLQPVFAQWVQNLHTLAPGGTAPNAAATASVAFGGDVVAVGGKVAMMPIVLGTADFMVHHIHAFTIHVTVLILLKGVLFARSSRLIPDKANLGFRFPCDGPGRGGTCQVSGWDHVFLGLFWMYNCISVVIFHFSWKMQSDVWGTVAPDGTVSHITGGNFAQSAITINGWLRDFLWAQASQVIGSYGSALSAYGLLFLGAHFIWAFSLMFLFSGRGYWQELIESIVWAHNKLKVAPAIQPRALSIIQGRAVGVAHYLLGGIATTWAFFLARIISVG

Entity 2 Entity 2 polymer

Description description	Photosystem I P700 chlorophyll a apoprotein A2
Molecular weight formula_weight	83123.6 kDa
EC 编号 ec_number	1.97.1.12
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,b,2

MATKFPKFSQDLAQDPTTRRIWYAIAMAHDFESHDGMTEENLYQKIFASHFGHLAIIFLWVSGSLFHVAWQGNFEQWVQDPVNTRPIAHAIWDPQFGKAAVDAFTQAGASNPVDIAYSGVYHWWYTIGMRTNGDLYQGAIFLLILASLALFAGWLHLQPKFRPSLSWFKNAESRLNHHLAGLFGVSSLAWAGHLIHVAIPESRGQHVGWDNFLSTMPHPAGLAPFFTGNWGVYAQNPDTASHVFGTAQGAGTAILTFLGGFHPQTESLWLTDMAHHHLAIAVLFIVAGHMYRTQFGIGHSIKEMMDAKDFFGTKVEGPFNMPHQGIYETYNNSLHFQLGWHLACLGVITSLVAQHMYSLPPYAFIAQDHTTMAALYTHHQYIAGFLMVGAFAHGAIFLVRDYDPAQNKGNVLDRVLQHKEAIISHLSWVSLFLGFHTLGLYVHNDVVVAFGTPEKQILIEPVFAQFIQAAHGKLLYGFDTLLSNPDSIASTAWPNYGNVWLPGWLDAINSGTNSLFLTIGPGDFLVHHAIALGLHTTTLILVKGALDARGSKLMPDKKDFGYAFPCDGPGRGGTCDISAWDAFYLAMFWMLNTIGWVTFYWHWKHLGVWEGNVAQFNESSTYLMGWLRDYLWLNSSQLINGYNPFGTNNLSVWAWMFLFGHLVWATGFMFLISWRGYWQELIETLVWAHERTPLANLVRWKDKPVALSIVQARLVGLAHFSVGYILTYAAFLIASTAAKFG

Entity 3 Entity 3 polymer

Description description	Photosystem I iron-sulfur center
Molecular weight formula_weight	8809.2 kDa
EC 编号 ec_number	1.97.1.12
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,c,3

MAHTVKIYDTCIGCTQCVRACPTDVLEMVPWDGCKAGQIASSPRTEDCVGCKRCETACPTDFLSIRVYLGAETTRSMGLAY

Entity 4 Entity 4 polymer

Description description	Photosystem I reaction center subunit II
Molecular weight formula_weight	15389.5 kDa
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D,d,4

MTTLTGQPPLYGGSTGGLLSAADTEEKYAITWTSPKEQVFEMPTAGAAVMREGENLVYFARKEQCLALAAQQLRPRKINDYKIYRIFPDGETVLIHPKDGVFPEKVNKGREAVNSVPRSIGQNPNPSQLKFTGKKPYDP

Entity 5 Entity 5 polymer

Description description	Photosystem I reaction center subunit IV
Molecular weight formula_weight	8399.5 kDa
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E,e,5

MVQRGSKVKILRPESYWYNEVGTVASVDQTPGVKYPVIVRFDKVNYTGYSGSASGVNTNNFALHEVQEVAPPKKGK

Entity 6 Entity 6 polymer

Description description	Photosystem I reaction center subunit III
Molecular weight formula_weight	15129.4 kDa
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	F,f,6

DVAGLVPCKDSPAFQKRAAAAVNTTADPASGQKRFERYSQALCGEDGLPHLVVDGRLSRAGDFLIPSVLFLYIAGWIGWVGRAYLIAVRNSGEANEKEIIIDVPLAIKCMLTGFAWPLAALKELASGELTAKDNEITVSPR

Entity 7 Entity 7 polymer

Description description	Photosystem I reaction center subunit VIII
Molecular weight formula_weight	4325.2 kDa
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	I,i,7

MMGSYAASFLPWIFIPVVCWLMPTVVMGLLFLYIEGEA

Entity 8 Entity 8 polymer

Description description	Photosystem I reaction center subunit IX
Molecular weight formula_weight	4798.7 kDa
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	J,j,8

MKHFLTYLSTAPVLAAIWMTITAGILIEFNRFYPDLLFHPL

Entity 9 Entity 9 polymer

Description description	Photosystem I reaction center subunit PsaK
Molecular weight formula_weight	8484.0 kDa
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	K,k,9

MVLATLPDTTWTPSVGLVVILCNLFAIALGRYAIQSRGKGPGLPIALPALFEGFGLPELLATTSFGHLLAAGVVSGLQYAGAL

Entity 10 Entity 10 polymer

Description description	Photosystem I reaction center subunit XI
Molecular weight formula_weight	16287.8 kDa
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	L,l,0

MAEELVKPYNGDPFVGHLSTPISDSGLVKTFIGNLPAYRQGLSPILRGLEVGMAHGYFLIGPWVKLGPLRDSDVANLGGLISGIALILVATACLAAYGLVSFQKGGSSSDPLKTSEGWSQFTAGFFVGAMGSAFVAFFLLENFLVVDGIMTGLFN

Entity 11 Entity 11 polymer

Description description	Photosystem I reaction center subunit XII
Molecular weight formula_weight	3426.1 kDa
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	M,m,y

MALTDTQVYVALVIALLPAVLAFRLSTELYK

Entity 12 Entity 12 polymer

Description description	Photosystem I 4.8K protein
Molecular weight formula_weight	4104.9 kDa
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	X,x,z

MATKSAKPTYAFRTFWAVLLLAINFLVAAYYFGILK

Entity 13 Entity 13 non-polymer

Description description	CHLOROPHYLL A ISOMER
Molecular weight formula_weight	893.5 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 14 Entity 14 non-polymer

Description description	CHLOROPHYLL A
Molecular weight formula_weight	893.5 kDa
Source method src_method	syn
Copy count entity_count	288

Entity 15 Entity 15 non-polymer

Description description	PHYLLOQUINONE
Molecular weight formula_weight	450.7 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 16 Entity 16 non-polymer

Description description	IRON/SULFUR CLUSTER
Molecular weight formula_weight	351.6 kDa
Source method src_method	syn
Copy count entity_count	9

Entity 17 Entity 17 non-polymer

Description description	BETA-CAROTENE
Molecular weight formula_weight	536.9 kDa
Source method src_method	syn
Copy count entity_count	72

Entity 18 Entity 18 non-polymer

Description description	1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
Molecular weight formula_weight	723.0 kDa
Source method src_method	syn
Copy count entity_count	15

Entity 19 Entity 19 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 20 Entity 20 non-polymer

Description description	1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE
Molecular weight formula_weight	787.2 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 21 Entity 21 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	51

▼

6. Fold Classification (SCOP + CATH) 27 domains

SCOP 2.08 (24 domains)

Domain ID domain_id	d6trd0_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.31 — Photosystem I reaction center subunit XI, PsaL
Superfamily Superfamily superfamily	f.31.1 — Photosystem I reaction center subunit XI, PsaL
Family Family family	f.31.1.1 — Photosystem I reaction center subunit XI, PsaL

Domain ID domain_id	d6trd1_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.29 — Photosystem I subunits PsaA/PsaB
Superfamily Superfamily superfamily	f.29.1 — Photosystem I subunits PsaA/PsaB
Family Family family	f.29.1.1 — Photosystem I subunits PsaA/PsaB

Domain ID domain_id	d6trd2_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.29 — Photosystem I subunits PsaA/PsaB
Superfamily Superfamily superfamily	f.29.1 — Photosystem I subunits PsaA/PsaB
Family Family family	f.29.1.1 — Photosystem I subunits PsaA/PsaB

Domain ID domain_id	d6trd3_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.1 — 4Fe-4S ferredoxins
Family Family family	d.58.1.2 — 7-Fe ferredoxin

Domain ID domain_id	d6trd4_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.187 — Photosystem I subunit PsaD
Superfamily Superfamily superfamily	d.187.1 — Photosystem I subunit PsaD
Family Family family	d.187.1.1 — Photosystem I subunit PsaD

Domain ID domain_id	d6trd5_
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.4 — Electron transport accessory proteins
Family Family family	b.34.4.2 — Photosystem I accessory protein E (PsaE)

Domain ID domain_id	d6trd6_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.16 — Subunit III of photosystem I reaction centre, PsaF
Family Family family	f.23.16.1 — Subunit III of photosystem I reaction centre, PsaF

Domain ID domain_id	d6trd7_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.17 — Subunit VIII of photosystem I reaction centre, PsaI
Family Family family	f.23.17.1 — Subunit VIII of photosystem I reaction centre, PsaI

Domain ID domain_id	d6trd8_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.18 — Subunit IX of photosystem I reaction centre, PsaJ
Family Family family	f.23.18.1 — Subunit IX of photosystem I reaction centre, PsaJ

Domain ID domain_id	d6trd9_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.30 — Photosystem I reaction center subunit X, PsaK
Superfamily Superfamily superfamily	f.30.1 — Photosystem I reaction center subunit X, PsaK
Family Family family	f.30.1.0 — automated matches

Domain ID domain_id	d6trda_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.29 — Photosystem I subunits PsaA/PsaB
Superfamily Superfamily superfamily	f.29.1 — Photosystem I subunits PsaA/PsaB
Family Family family	f.29.1.1 — Photosystem I subunits PsaA/PsaB

Domain ID domain_id	d6trdb_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.29 — Photosystem I subunits PsaA/PsaB
Superfamily Superfamily superfamily	f.29.1 — Photosystem I subunits PsaA/PsaB
Family Family family	f.29.1.1 — Photosystem I subunits PsaA/PsaB

Domain ID domain_id	d6trdc_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.1 — 4Fe-4S ferredoxins
Family Family family	d.58.1.2 — 7-Fe ferredoxin

Domain ID domain_id	d6trdd_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.187 — Photosystem I subunit PsaD
Superfamily Superfamily superfamily	d.187.1 — Photosystem I subunit PsaD
Family Family family	d.187.1.1 — Photosystem I subunit PsaD

Domain ID domain_id	d6trde_
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.4 — Electron transport accessory proteins
Family Family family	b.34.4.2 — Photosystem I accessory protein E (PsaE)

Domain ID domain_id	d6trdf_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.16 — Subunit III of photosystem I reaction centre, PsaF
Family Family family	f.23.16.1 — Subunit III of photosystem I reaction centre, PsaF

Domain ID domain_id	d6trdi_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.17 — Subunit VIII of photosystem I reaction centre, PsaI
Family Family family	f.23.17.1 — Subunit VIII of photosystem I reaction centre, PsaI

Domain ID domain_id	d6trdj_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.18 — Subunit IX of photosystem I reaction centre, PsaJ
Family Family family	f.23.18.1 — Subunit IX of photosystem I reaction centre, PsaJ

Domain ID domain_id	d6trdk_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.30 — Photosystem I reaction center subunit X, PsaK
Superfamily Superfamily superfamily	f.30.1 — Photosystem I reaction center subunit X, PsaK
Family Family family	f.30.1.0 — automated matches

Domain ID domain_id	d6trdl_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.31 — Photosystem I reaction center subunit XI, PsaL
Superfamily Superfamily superfamily	f.31.1 — Photosystem I reaction center subunit XI, PsaL
Family Family family	f.31.1.1 — Photosystem I reaction center subunit XI, PsaL

Domain ID domain_id	d6trdm_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.19 — Subunit XII of photosystem I reaction centre, PsaM
Family Family family	f.23.19.1 — Subunit XII of photosystem I reaction centre, PsaM

Domain ID domain_id	d6trdx_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.20 — Subunit PsaX of photosystem I reaction centre
Family Family family	f.23.20.1 — Subunit PsaX of photosystem I reaction centre

Domain ID domain_id	d6trdy_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.19 — Subunit XII of photosystem I reaction centre, PsaM
Family Family family	f.23.19.1 — Subunit XII of photosystem I reaction centre, PsaM

Domain ID domain_id	d6trdz_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.20 — Subunit PsaX of photosystem I reaction centre
Family Family family	f.23.20.1 — Subunit PsaX of photosystem I reaction centre

CATH v4.4 (3 domains)

Domain ID domain_id	6trd001
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1240 — Photosystem 1 Reaction Centre Subunit Xi; Chain: L;
Homologous superfamily homologous superfamily	10 — Photosystem I PsaL, reaction centre subunit XI

Domain ID domain_id	6trdL01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1240 — Photosystem 1 Reaction Centre Subunit Xi; Chain: L;
Homologous superfamily homologous superfamily	10 — Photosystem I PsaL, reaction centre subunit XI

Domain ID domain_id	6trdl01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1240 — Photosystem 1 Reaction Centre Subunit Xi; Chain: L;
Homologous superfamily homologous superfamily	10 — Photosystem I PsaL, reaction centre subunit XI

▶

Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	—

Space group space_group	P 1
Space-group number int_tables_number	1
Crystal system crystal_system	triclinic

Resolution resolution	3.16 Å
Resolution测定Method resolution_method	—
颗粒数 num_particles	175999

Cryo- EM structure of the Thermosynechococcus elongatus photosystem I in the presence of cytochrome c6

1. Protein Identity and Related Structures Protein Identity & Related Structures

Photosystem I P700 chlorophyll a apoprotein A1

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem I P700 chlorophyll a apoprotein A2

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem I iron-sulfur center

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem I reaction center subunit II

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem I reaction center subunit IV

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem I reaction center subunit III

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem I reaction center subunit VIII

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem I reaction center subunit IX

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem I reaction center subunit PsaK

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem I reaction center subunit XI

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer