6tra

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 12	Photosystem I P700 chlorophyll a apoprotein A2 × 1 （P0A407） Photosystem I iron-sulfur center × 1 （P0A415） Photosystem I reaction center subunit II × 1 （P0A420） Photosystem I reaction center subunit IV × 1 （P0A423） Photosystem I reaction center subunit III × 1 （P0A401） Photosystem I reaction center subunit VIII × 1 （P0A427） Photosystem I reaction center subunit IX × 1 （P0A429） Photosystem I reaction center subunit PsaK × 1 （P0A425） Photosystem I reaction center subunit XI × 1 （Q8DGB4） Photosystem I reaction center subunit XII × 1 （P0A403） Photosystem I 4.8K protein × 1 （Q8DKP6） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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 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 12	Photosystem I P700 chlorophyll a apoprotein A1 × 1 （P0A405） Photosystem I iron-sulfur center × 1 （P0A415） Photosystem I reaction center subunit II × 1 （P0A420） Photosystem I reaction center subunit IV × 1 （P0A423） Photosystem I reaction center subunit III × 1 （P0A401） Photosystem I reaction center subunit VIII × 1 （P0A427） Photosystem I reaction center subunit IX × 1 （P0A429） Photosystem I reaction center subunit PsaK × 1 （P0A425） Photosystem I reaction center subunit XI × 1 （Q8DGB4） Photosystem I reaction center subunit XII × 1 （P0A403） Photosystem I 4.8K protein × 1 （Q8DKP6） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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 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 12	Photosystem I P700 chlorophyll a apoprotein A1 × 1 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 1 （P0A407） Photosystem I reaction center subunit II × 1 （P0A420） Photosystem I reaction center subunit IV × 1 （P0A423） Photosystem I reaction center subunit III × 1 （P0A401） Photosystem I reaction center subunit VIII × 1 （P0A427） Photosystem I reaction center subunit IX × 1 （P0A429） Photosystem I reaction center subunit PsaK × 1 （P0A425） Photosystem I reaction center subunit XI × 1 （Q8DGB4） Photosystem I reaction center subunit XII × 1 （P0A403） Photosystem I 4.8K protein × 1 （Q8DKP6） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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 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 12	Photosystem I P700 chlorophyll a apoprotein A1 × 1 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 1 （P0A407） Photosystem I iron-sulfur center × 1 （P0A415） Photosystem I reaction center subunit IV × 1 （P0A423） Photosystem I reaction center subunit III × 1 （P0A401） Photosystem I reaction center subunit VIII × 1 （P0A427） Photosystem I reaction center subunit IX × 1 （P0A429） Photosystem I reaction center subunit PsaK × 1 （P0A425） Photosystem I reaction center subunit XI × 1 （Q8DGB4） Photosystem I reaction center subunit XII × 1 （P0A403） Photosystem I 4.8K protein × 1 （Q8DKP6） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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 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 12	Photosystem I P700 chlorophyll a apoprotein A1 × 1 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 1 （P0A407） Photosystem I iron-sulfur center × 1 （P0A415） Photosystem I reaction center subunit II × 1 （P0A420） Photosystem I reaction center subunit III × 1 （P0A401） Photosystem I reaction center subunit VIII × 1 （P0A427） Photosystem I reaction center subunit IX × 1 （P0A429） Photosystem I reaction center subunit PsaK × 1 （P0A425） Photosystem I reaction center subunit XI × 1 （Q8DGB4） Photosystem I reaction center subunit XII × 1 （P0A403） Photosystem I 4.8K protein × 1 （Q8DKP6） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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 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 12	Photosystem I P700 chlorophyll a apoprotein A1 × 1 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 1 （P0A407） Photosystem I iron-sulfur center × 1 （P0A415） Photosystem I reaction center subunit II × 1 （P0A420） Photosystem I reaction center subunit IV × 1 （P0A423） Photosystem I reaction center subunit VIII × 1 （P0A427） Photosystem I reaction center subunit IX × 1 （P0A429） Photosystem I reaction center subunit PsaK × 1 （P0A425） Photosystem I reaction center subunit XI × 1 （Q8DGB4） Photosystem I reaction center subunit XII × 1 （P0A403） Photosystem I 4.8K protein × 1 （Q8DKP6） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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 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 12	Photosystem I P700 chlorophyll a apoprotein A1 × 1 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 1 （P0A407） Photosystem I iron-sulfur center × 1 （P0A415） Photosystem I reaction center subunit II × 1 （P0A420） Photosystem I reaction center subunit IV × 1 （P0A423） Photosystem I reaction center subunit III × 1 （P0A401） Photosystem I reaction center subunit IX × 1 （P0A429） Photosystem I reaction center subunit PsaK × 1 （P0A425） Photosystem I reaction center subunit XI × 1 （Q8DGB4） Photosystem I reaction center subunit XII × 1 （P0A403） Photosystem I 4.8K protein × 1 （Q8DKP6） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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 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 12	Photosystem I P700 chlorophyll a apoprotein A1 × 1 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 1 （P0A407） Photosystem I iron-sulfur center × 1 （P0A415） Photosystem I reaction center subunit II × 1 （P0A420） Photosystem I reaction center subunit IV × 1 （P0A423） Photosystem I reaction center subunit III × 1 （P0A401） Photosystem I reaction center subunit VIII × 1 （P0A427） Photosystem I reaction center subunit PsaK × 1 （P0A425） Photosystem I reaction center subunit XI × 1 （Q8DGB4） Photosystem I reaction center subunit XII × 1 （P0A403） Photosystem I 4.8K protein × 1 （Q8DKP6） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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 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 12	Photosystem I P700 chlorophyll a apoprotein A1 × 1 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 1 （P0A407） Photosystem I iron-sulfur center × 1 （P0A415） Photosystem I reaction center subunit II × 1 （P0A420） Photosystem I reaction center subunit IV × 1 （P0A423） Photosystem I reaction center subunit III × 1 （P0A401） Photosystem I reaction center subunit VIII × 1 （P0A427） Photosystem I reaction center subunit IX × 1 （P0A429） Photosystem I reaction center subunit XI × 1 （Q8DGB4） Photosystem I reaction center subunit XII × 1 （P0A403） Photosystem I 4.8K protein × 1 （Q8DKP6） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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 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 12	Photosystem I P700 chlorophyll a apoprotein A1 × 1 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 1 （P0A407） Photosystem I iron-sulfur center × 1 （P0A415） Photosystem I reaction center subunit II × 1 （P0A420） Photosystem I reaction center subunit IV × 1 （P0A423） Photosystem I reaction center subunit III × 1 （P0A401） Photosystem I reaction center subunit VIII × 1 （P0A427） Photosystem I reaction center subunit IX × 1 （P0A429） Photosystem I reaction center subunit PsaK × 1 （P0A425） Photosystem I reaction center subunit XII × 1 （P0A403） Photosystem I 4.8K protein × 1 （Q8DKP6） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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 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 12	Photosystem I P700 chlorophyll a apoprotein A1 × 1 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 1 （P0A407） Photosystem I iron-sulfur center × 1 （P0A415） Photosystem I reaction center subunit II × 1 （P0A420） Photosystem I reaction center subunit IV × 1 （P0A423） Photosystem I reaction center subunit III × 1 （P0A401） Photosystem I reaction center subunit VIII × 1 （P0A427） Photosystem I reaction center subunit IX × 1 （P0A429） Photosystem I reaction center subunit PsaK × 1 （P0A425） Photosystem I reaction center subunit XI × 1 （Q8DGB4） Photosystem I 4.8K protein × 1 （Q8DKP6） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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

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 12	Photosystem I P700 chlorophyll a apoprotein A1 × 1 （P0A405） Photosystem I P700 chlorophyll a apoprotein A2 × 1 （P0A407） Photosystem I iron-sulfur center × 1 （P0A415） Photosystem I reaction center subunit II × 1 （P0A420） Photosystem I reaction center subunit IV × 1 （P0A423） Photosystem I reaction center subunit III × 1 （P0A401） Photosystem I reaction center subunit VIII × 1 （P0A427） Photosystem I reaction center subunit IX × 1 （P0A429） Photosystem I reaction center subunit PsaK × 1 （P0A425） Photosystem I reaction center subunit XI × 1 （Q8DGB4） Photosystem I reaction center subunit XII × 1 （P0A403） CHLOROPHYLL A ISOMER × 1 CHLOROPHYLL A × 96 PHYLLOQUINONE × 2 BETA-CAROTENE × 24 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 5 IRON/SULFUR CLUSTER × 3 CALCIUM ION × 2 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 1 water × 11	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

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	6tra
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.

6tra__assembly_1__model_1

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

Download this curve (.dat)

6tra__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

6tra__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	42.85 Å
Rg (electron density)	41.82 Å
Total Rg	42.30 Å
Atom count	24980
Residues	2281
Excluded volume	469790 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`6tra__assembly_1__model_1`	dodecameric （12）	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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	25197

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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C

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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D

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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E

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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	F

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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	I

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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	J

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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	K

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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	L

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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	M

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	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	X

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	1

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	96

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	2

Entity 16 Entity 16 non-polymer

Description description	BETA-CAROTENE
Molecular weight formula_weight	536.9 kDa
Source method src_method	syn
Copy count entity_count	24

Entity 17 Entity 17 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	5

Entity 18 Entity 18 non-polymer

Description description	IRON/SULFUR CLUSTER
Molecular weight formula_weight	351.6 kDa
Source method src_method	syn
Copy count entity_count	3

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	2

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	1

Entity 21 Entity 21 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	217

▼

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (11 domains)

Domain ID domain_id	d6traa_
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	d6trab_
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	d6trac_
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	d6trad_
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	d6trae_
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	d6traf_
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	d6trai_
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	d6traj_
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	d6tral_
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	d6tram_
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	d6trax_
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 (1 domains)

Domain ID domain_id	6traL01
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	2.85 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