1jb0

Crystal Structure of Photosystem I: a Photosynthetic Reaction Center and Core Antenna System from Cyanobacteria

Method: X-RAY DIFFRACTION

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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 （P25897） PHOTOSYSTEM I IRON-SULFUR CENTER × 3 （P18083） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II × 3 （P20452） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV × 3 （P25898） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III × 3 （P25899） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII × 3 （P25900） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IX × 3 （P25901） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT X × 3 （P20453） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XI × 3 （P25902） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XII × 3 （P25903） PHOTOSYSTEM I SUBUNIT PSAX × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 66 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 9 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 CALCIUM ION × 3 water × 30	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAA_SYNEL
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 P25897

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 （P25896） PHOTOSYSTEM I IRON-SULFUR CENTER × 3 （P18083） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II × 3 （P20452） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV × 3 （P25898） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III × 3 （P25899） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII × 3 （P25900） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IX × 3 （P25901） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT X × 3 （P20453） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XI × 3 （P25902） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XII × 3 （P25903） PHOTOSYSTEM I SUBUNIT PSAX × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 66 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 9 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 CALCIUM ION × 3 water × 30	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAB_SYNEL
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–740； UniProt 1–740

PHOTOSYSTEM I IRON-SULFUR CENTER

OrganismNot specified

UniProt P18083

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 （P25896） PHOTOSYSTEM I P700 CHLOROPHYLL A APOPROTEIN A2 × 3 （P25897） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II × 3 （P20452） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV × 3 （P25898） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III × 3 （P25899） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII × 3 （P25900） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IX × 3 （P25901） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT X × 3 （P20453） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XI × 3 （P25902） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XII × 3 （P25903） PHOTOSYSTEM I SUBUNIT PSAX × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 66 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 9 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 CALCIUM ION × 3 water × 30	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAC_SYNEL
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain C； PDBConstruct 1–80； UniProt 1–80

PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II

OrganismNot specified

UniProt P20452

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 （P25896） PHOTOSYSTEM I P700 CHLOROPHYLL A APOPROTEIN A2 × 3 （P25897） PHOTOSYSTEM I IRON-SULFUR CENTER × 3 （P18083） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV × 3 （P25898） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III × 3 （P25899） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII × 3 （P25900） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IX × 3 （P25901） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT X × 3 （P20453） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XI × 3 （P25902） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XII × 3 （P25903） PHOTOSYSTEM I SUBUNIT PSAX × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 66 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 9 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 CALCIUM ION × 3 water × 30	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAD_SYNEL
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain D； PDBConstruct 1–138； UniProt 1–138

PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV

OrganismNot specified

UniProt P25898

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 （P25896） PHOTOSYSTEM I P700 CHLOROPHYLL A APOPROTEIN A2 × 3 （P25897） PHOTOSYSTEM I IRON-SULFUR CENTER × 3 （P18083） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II × 3 （P20452） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III × 3 （P25899） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII × 3 （P25900） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IX × 3 （P25901） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT X × 3 （P20453） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XI × 3 （P25902） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XII × 3 （P25903） PHOTOSYSTEM I SUBUNIT PSAX × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 66 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 9 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 CALCIUM ION × 3 water × 30	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAE_SYNEL
Isoform	—
PDB entities	5
Chains and sequence ranges	Author chain E； PDBConstruct 1–75； UniProt 1–75

PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III

OrganismNot specified

UniProt P25899

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 （P25896） PHOTOSYSTEM I P700 CHLOROPHYLL A APOPROTEIN A2 × 3 （P25897） PHOTOSYSTEM I IRON-SULFUR CENTER × 3 （P18083） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II × 3 （P20452） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV × 3 （P25898） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII × 3 （P25900） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IX × 3 （P25901） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT X × 3 （P20453） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XI × 3 （P25902） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XII × 3 （P25903） PHOTOSYSTEM I SUBUNIT PSAX × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 66 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 9 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 CALCIUM ION × 3 water × 30	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAF_SYNEL
Isoform	—
PDB entities	6
Chains and sequence ranges	Author chain F； PDBConstruct 1–164； UniProt 1–164

PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII

OrganismNot specified

UniProt P25900

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 （P25896） PHOTOSYSTEM I P700 CHLOROPHYLL A APOPROTEIN A2 × 3 （P25897） PHOTOSYSTEM I IRON-SULFUR CENTER × 3 （P18083） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II × 3 （P20452） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV × 3 （P25898） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III × 3 （P25899） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IX × 3 （P25901） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT X × 3 （P20453） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XI × 3 （P25902） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XII × 3 （P25903） PHOTOSYSTEM I SUBUNIT PSAX × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 66 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 9 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 CALCIUM ION × 3 water × 30	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

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

PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IX

OrganismNot specified

UniProt P25901

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 （P25896） PHOTOSYSTEM I P700 CHLOROPHYLL A APOPROTEIN A2 × 3 （P25897） PHOTOSYSTEM I IRON-SULFUR CENTER × 3 （P18083） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II × 3 （P20452） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV × 3 （P25898） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III × 3 （P25899） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII × 3 （P25900） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT X × 3 （P20453） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XI × 3 （P25902） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XII × 3 （P25903） PHOTOSYSTEM I SUBUNIT PSAX × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 66 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 9 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 CALCIUM ION × 3 water × 30	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

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

PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT X

OrganismNot specified

UniProt P20453

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 （P25896） PHOTOSYSTEM I P700 CHLOROPHYLL A APOPROTEIN A2 × 3 （P25897） PHOTOSYSTEM I IRON-SULFUR CENTER × 3 （P18083） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II × 3 （P20452） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV × 3 （P25898） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III × 3 （P25899） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII × 3 （P25900） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IX × 3 （P25901） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XI × 3 （P25902） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XII × 3 （P25903） PHOTOSYSTEM I SUBUNIT PSAX × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 66 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 9 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 CALCIUM ION × 3 water × 30	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

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

PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XI

OrganismNot specified

UniProt P25902

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 （P25896） PHOTOSYSTEM I P700 CHLOROPHYLL A APOPROTEIN A2 × 3 （P25897） PHOTOSYSTEM I IRON-SULFUR CENTER × 3 （P18083） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II × 3 （P20452） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV × 3 （P25898） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III × 3 （P25899） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII × 3 （P25900） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IX × 3 （P25901） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT X × 3 （P20453） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XII × 3 （P25903） PHOTOSYSTEM I SUBUNIT PSAX × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 66 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 9 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 CALCIUM ION × 3 water × 30	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSAL_SYNEN
Isoform	—
PDB entities	10
Chains and sequence ranges	Author chain L； PDBConstruct 1–143； UniProt 1–143

PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XII

OrganismNot specified

UniProt P25903

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 （P25896） PHOTOSYSTEM I P700 CHLOROPHYLL A APOPROTEIN A2 × 3 （P25897） PHOTOSYSTEM I IRON-SULFUR CENTER × 3 （P18083） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II × 3 （P20452） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV × 3 （P25898） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III × 3 （P25899） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII × 3 （P25900） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IX × 3 （P25901） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT X × 3 （P20453） PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT XI × 3 （P25902） PHOTOSYSTEM I SUBUNIT PSAX × 3 CHLOROPHYLL A × 288 PHYLLOQUINONE × 6 IRON/SULFUR CLUSTER × 9 BETA-CAROTENE × 66 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 9 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 3 CALCIUM ION × 3 water × 30	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

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

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	1jb0
Deposition date deposition_date	2001-06-01
Structure title title	Crystal Structure of Photosystem I: a Photosynthetic Reaction Center and Core Antenna System from Cyanobacteria
Keywords keywords	MEMBRANE PROTEIN, MULTIPROTEIN-PIGMENT COMPLEX, PHOTOSYNTHESIS; PHOTOSYNTHESIS
Experimental Method method	X-RAY DIFFRACTION

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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.

1jb0__assembly_1__model_1

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

Download this curve (.dat)

1jb0__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1jb0__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	69.02 Å
Rg (electron density)	68.23 Å
Total Rg	68.13 Å
Atom count	71991
Residues	6729
Excluded volume	1342000 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1jb0__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 (20)

Entity 1 Entity 1 polymer

Description description	PHOTOSYSTEM I P700 CHLOROPHYLL A APOPROTEIN A1
Molecular weight formula_weight	83267.8 kDa
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	24198

MTISPPEREPKVRVVVDNDPVPTSFEKWAKPGHFDRTLARGPQTTTWIWNLHALAHDFDTHTSDLEDISRKIFSAHFGHLAVVFIWLSGMYFHGAKFSNYEAWLADPTGIKPSAQVVWPIVGQGILNGDVGGGFHGIQITSGLFQLWRASGITNEFQLYCTAIGGLVMAGLMLFAGWFHYHKRAPKLEWFQNVESMLNHHLAGLLGLGSLAWAGHQIHVSLPINKLLDAGVAAKDIPLPHEFILNPSLMAELYPKVDWGFFSGVIPFFTFNWAAYSDFLTFNGGLNPVTGGLWLSDTAHHHLAIAVLFIIAGHMYRTNWGIGHSLKEILEAHKGPFTGAGHKGLYEVLTTSWHAQLAINLAMMGSLSIIVAQHMYAMPPYPYLATDYPTQLSLFTHHMWIGGFLVVGGAAHGAIFMVRDYDPAMNQNNVLDRVLRHRDAIISHLNWVCIFLGFHSFGLYVHNDTMRAFGRPQDMFSDTGIQLQPVFAQWVQNLHTLAPGGTAPNAAATASVAFGGDVVAVGGKVAMMPIVLGTADFMVHHIHAFTIHVTVLILLKGVLFARSSRLIPDKANLGFRFPCDGPGRGGTCQVSGWDHVFLGLFWMYNCISVVIFHFSWKMQSDVWGTVAPDGTVSHITGGNFAQSAITINGWLRDFLWAQASQVIGSYGSALSAYGLLFLGAHFIWAFSLMFLFSGRGYWQELIESIVWAHNKLKVAPAIQPRALSIIQGRAVGVAHYLLGGIATTWAFFLARIISVG

Entity 2 Entity 2 polymer

Description description	PHOTOSYSTEM I P700 CHLOROPHYLL A APOPROTEIN A2
Molecular weight formula_weight	82992.5 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

ATKFPKFSQDLAQDPTTRRIWYAIAMAHDFESHDGMTEENLYQKIFASHFGHLAIIFLWVSGSLFHVAWQGNFEQWVQDPVNTRPIAHAIWDPQFGKAAVDAFTQAGASNPVDIAYSGVYHWWYTIGMRTNGDLYQGAIFLLILASLALFAGWLHLQPKFRPSLSWFKNAESRLNHHLAGLFGVSSLAWAGHLIHVAIPESRGQHVGWDNFLSTMPHPAGLAPFFTGNWGVYAQNPDTASHVFGTAQGAGTAILTFLGGFHPQTESLWLTDMAHHHLAIAVLFIVAGHMYRTQFGIGHSIKEMMDAKDFFGTKVEGPFNMPHQGIYETYNNSLHFQLGWHLACLGVITSLVAQHMYSLPPYAFIAQDHTTMAALYTHHQYIAGFLMVGAFAHGAIFLVRDYDPAQNKGNVLDRVLQHKEAIISHLSWVSLFLGFHTLGLYVHNDVVVAFGTPEKQILIEPVFAQFIQAAHGKLLYGFDTLLSNPDSIASTAWPNYGNVWLPGWLDAINSGTNSLFLTIGPGDFLVHHAIALGLHTTTLILVKGALDARGSKLMPDKKDFGYAFPCDGPGRGGTCDISAWDAFYLAMFWMLNTIGWVTFYWHWKHLGVWEGNVAQFNESSTYLMGWLRDYLWLNSSQLINGYNPFGTNNLSVWAWMFLFGHLVWATGFMFLISWRGYWQELIETLVWAHERTPLANLVRWKDKPVALSIVQARLVGLAHFSVGYILTYAAFLIASTAAKFG

Entity 3 Entity 3 polymer

Description description	PHOTOSYSTEM I IRON-SULFUR CENTER
Molecular weight formula_weight	8678.0 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C

AHTVKIYDTCIGCTQCVRACPTDVLEMVPWDGCKAGQIASSPRTEDCVGCKRCETACPTDFLSIRVYLGAETTRSMGLAY

Entity 4 Entity 4 polymer

Description description	PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT II
Molecular weight formula_weight	15258.3 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D

TTLTGQPPLYGGSTGGLLSAADTEEKYAITWTSPKEQVFEMPTAGAAVMREGENLVYFARKEQCLALAAQQLRPRKINDYKIYRIFPDGETVLIHPKDGVFPEKVNKGREAVNSVPRSIGQNPNPSQLKFTGKKPYDP

Entity 5 Entity 5 polymer

Description description	PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT IV
Molecular weight formula_weight	8268.3 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E

VQRGSKVKILRPESYWYNEVGTVASVDQTPGVKYPVIVRFDKVNYTGYSGSASGVNTNNFALHEVQEVAPPKKGK

Entity 6 Entity 6 polymer

Description description	PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT III
Molecular weight formula_weight	17716.6 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	F

MRRFLALLLVLTLWLGFTPLASADVAGLVPCKDSPAFQKRAAAAVNTTADPASGQKRFERYSQALCGEDGLPHLVVDGRLSRAGDFLIPSVLFLYIAGWIGWVGRAYLIAVRNSGEANEKEIIIDVPLAIKCMLTGFAWPLAALKELASGELTAKDNEITVSPR

Entity 7 Entity 7 polymer

Description description	PHOTOSYSTEM 1 REACTION CENTRE SUBUNIT VIII
Molecular weight formula_weight	4297.2 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 1 REACTION CENTRE SUBUNIT IX
Molecular weight formula_weight	4770.7 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 1 REACTION CENTRE SUBUNIT X
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 1 REACTION CENTRE SUBUNIT XI
Molecular weight formula_weight	16156.6 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	L

AEELVKPYNGDPFVGHLSTPISDSGLVKTFIGNLPAYRQGLSPILRGLEVGMAHGYFLIGPWVKLGPLRDSDVANLGGLISGIALILVATACLAAYGLVSFQKGGSSSDPLKTSEGWSQFTAGFFVGAMGSAFVAFFLLENFLVVDGIMTGLFN

Entity 11 Entity 11 polymer

Description description	PHOTOSYSTEM 1 REACTION CENTRE 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 SUBUNIT PSAX
Molecular weight formula_weight	3845.5 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	X

ATKSAKPTYAFRTFWAVLLLAINFLVAAYYFAAAA

Entity 13 Entity 13 non-polymer

Description description	CHLOROPHYLL A
Molecular weight formula_weight	893.5 kDa
Source method src_method	syn
Copy count entity_count	96

Entity 14 Entity 14 non-polymer

Description description	PHYLLOQUINONE
Molecular weight formula_weight	450.7 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 15 Entity 15 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 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	22

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	3

Entity 18 Entity 18 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 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	1

Entity 20 Entity 20 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	201

▼

6. Fold Classification (SCOP + CATH) 22 domains

SCOP 2.08 (13 domains)

Domain ID domain_id	d1jb0a_
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	d1jb0b_
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	d1jb0c_
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	d1jb0d_
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	d1jb0e_
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	d1jb0f_
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	d1jb0i_
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	d1jb0j_
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	d1jb0k_
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.30.1.1 — Photosystem I reaction center subunit X, PsaK

Domain ID domain_id	d1jb0l_
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	d1jb0m_
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	d1jb0x1
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	d1jb0x2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

CATH v4.4 (9 domains)

Domain ID domain_id	1jb0A00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1130 — Photosystem I p700 chlorophyll A apoprotein A1
Homologous superfamily homologous superfamily	10 — Photosystem I PsaA/PsaB

Domain ID domain_id	1jb0B00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1130 — Photosystem I p700 chlorophyll A apoprotein A1
Homologous superfamily homologous superfamily	10 — Photosystem I PsaA/PsaB

Domain ID domain_id	1jb0C00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	20 —

Domain ID domain_id	1jb0D00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1470 — Photosystem 1 Reaction Centre Subunit Ii; Chain: D;
Homologous superfamily homologous superfamily	10 — Photosystem I PsaD, reaction center subunit II

Domain ID domain_id	1jb0E00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	50 —

Domain ID domain_id	1jb0F00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	8 — Helicase, Ruva Protein; domain 3
Homologous superfamily homologous superfamily	110 — Photosystem I, reaction centre, subunit PsaF

Domain ID domain_id	1jb0J00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	510 — Single helix bin

Domain ID domain_id	1jb0K00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	860 — Alpha-t-alpha
Homologous superfamily homologous superfamily	20 — Photosystem I PsaK, reaction centre

Domain ID domain_id	1jb0L00
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	281.000 Å
Unit-cell length b length_b	281.000 Å
Unit-cell length c length_c	165.200 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	6

Space group space_group	P 63
Space-group number int_tables_number	173
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	30.000 Å
R factor r_factor	0.1990
R_work r_work	0.1990
R_free r_free	0.2170

Crystal Structure of Photosystem I: a Photosynthetic Reaction Center and Core Antenna System from Cyanobacteria

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 1 REACTION CENTRE 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 1 REACTION CENTRE 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 1 REACTION CENTRE 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 1 REACTION CENTRE 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 1 REACTION CENTRE 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 1 REACTION CENTRE SUBUNIT X

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 1 REACTION CENTRE SUBUNIT XI

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer