Photosystem I P700 chlorophyll a apoprotein A2 - Prochlorococcus marinus (strain SARG / CCMP1375 / SS120)

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Q9RDV0 (PSAB_PROMA) Reviewed, UniProtKB/Swiss-Prot

Last modified May 1, 2013. Version 91. History...

Clusters with 100%, 90%, 50% identity |

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Names·Attributes·General annotation·Ontologies·Sequence annotation·Sequences·References·Cross-refs·Entry info·Documents Customize order

Names and origin

Protein names

Recommended name:
Photosystem I P700 chlorophyll a apoprotein A2
EC=1.97.1.12

Alternative name(s):
PsaB

Gene names

Name:	psaB
Ordered Locus Names:	Pro_1673

Organism

Prochlorococcus marinus (strain SARG / CCMP1375 / SS120) [Reference proteome] [HAMAP]

Taxonomic identifier

167539 [NCBI]

Taxonomic lineage

Bacteria › Cyanobacteria › Prochlorales › Prochlorococcaceae › Prochlorococcus ›

Protein attributes

Sequence length	747 AA.
Sequence status	Complete.
Protein existence	Inferred from homology

General annotation (Comments)

Function	PsaA and PsaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. Oxidized P700 is reduced on the lumenal side of the thylakoid membrane by plastocyanin or cytochrome c6 By similarity. HAMAP-Rule MF_00482
Catalytic activity	Reduced plastocyanin + oxidized ferredoxin + light = oxidized plastocyanin + reduced ferredoxin. HAMAP-Rule MF_00482
Cofactor	PSI electron transfer chain: 5 divinyl chlorophyll a, 1 divinyl chlorophyll a', 2 phylloquinones and 3 4Fe-4S clusters. PSI core antenna: 90 divinyl chlorophyll a, 22 carotenoids, 3 phospholipids and 1 galactolipid. P700 is a divinyl chlorophyll a/divinyl chlorophyll a' dimer, A0 is one or more divinyl chlorophyll a, A1 is one or both phylloquinones and FX is a shared 4Fe-4S iron-sulfur center By similarity.
Subunit structure	The PsaA/B heterodimer binds the P700 divinyl chlorophyll special pair and subsequent electron acceptors. PSI consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. The cyanobacterial PSI reaction center is composed of one copy each of PsaA,B,C,D,E,F,I,J,K,L,M and X, and forms trimeric complexes By similarity.
Subcellular location	Cellular thylakoid membrane; Multi-pass membrane protein By similarity HAMAP-Rule MF_00482.
Sequence similarities	Belongs to the PsaA/PsaB family.

Ontologies

Keywords
Biological process	Electron transport Photosynthesis Transport
Cellular component	Membrane Photosystem I Thylakoid
Domain	Transmembrane Transmembrane helix
Ligand	4Fe-4S Chlorophyll Chromophore Iron Iron-sulfur Magnesium Metal-binding
Molecular function	Oxidoreductase
Technical term	Complete proteome Reference proteome
Gene Ontology (GO)
Biological_process	electron transport chain Inferred from electronic annotation. Source: UniProtKB-KW photosynthesis Inferred from electronic annotation. Source: HAMAP protein-chromophore linkage Inferred from electronic annotation. Source: UniProtKB-KW
Cellular_component	integral to membrane Inferred from electronic annotation. Source: UniProtKB-KW photosystem I Inferred from electronic annotation. Source: UniProtKB-KW thylakoid membrane Inferred from electronic annotation. Source: UniProtKB-SubCell
Molecular_function	4 iron, 4 sulfur cluster binding Inferred from electronic annotation. Source: UniProtKB-KW chlorophyll binding Inferred from electronic annotation. Source: UniProtKB-KW electron carrier activity Inferred from electronic annotation. Source: HAMAP magnesium ion binding Inferred from electronic annotation. Source: HAMAP oxidoreductase activity Inferred from electronic annotation. Source: UniProtKB-KW
Complete GO annotation...

Sequence annotation (Features)

Feature key

Position(s)

Length

Description

Graphical view

Feature identifier

Molecule processing

Chain

1 – 747

747

Photosystem I P700 chlorophyll a apoprotein A2 HAMAP-Rule MF_00482

PRO_0000088647

Regions

Transmembrane

46 – 69

Helical; Name=I; Potential

Transmembrane

135 – 158

Helical; Name=II; Potential

Transmembrane

175 – 199

Helical; Name=III; Potential

Transmembrane

273 – 291

Helical; Name=IV; Potential

Transmembrane

341 – 364

Helical; Name=V; Potential

Transmembrane

380 – 406

Helical; Name=VI; Potential

Transmembrane

428 – 450

Helical; Name=VII; Potential

Transmembrane

530 – 548

Helical; Name=VIII; Potential

Transmembrane

588 – 609

Helical; Name=IX; Potential

Transmembrane

656 – 678

Helical; Name=X; Potential

Transmembrane

720 – 740

Helical; Name=XI; Potential

Sites

Metal binding

572

Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity

Metal binding

581

Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity

Metal binding

667

Magnesium (divinyl chlorophyll-a B1 axial ligand; P700 special pair) By similarity

Metal binding

675

Magnesium (divinyl chlorophyll-a B3 axial ligand) By similarity

Binding site

683

Divinyl chlorophyll-a B3 By similarity

Binding site

684

Phylloquinone B By similarity

Sequences

Sequence

Length

Mass (Da)

Tools

Q9RDV0 [UniParc].

Last modified May 1, 2000. Version 1.
Checksum: B2EE5DCD14C1BE4A
Show »

FASTA

747

83,238

        10         20         30         40         50         60 
MATKFPSFNQ GLAQDPTTRR IWYGIATAHD FESHDGMTEE QLYQKLFATH FGHLAIIGLW 

        70         80         90        100        110        120 
VAGNLFHIAW QGNFEQWVTD PLHIRPIAHA IWDPHFGQGI TDALTQAGAT SPVNIAYSGL 

       130        140        150        160        170        180 
YHWWYTIGMR TNAQLFQGAI FLNILVCWLL FAGWLHLQPK FRPSLAWFKN AEAQLNHHLA 

       190        200        210        220        230        240 
VLFGFSSIAW TGHLVHVAIP ESRGQHVGWD NWLSVLPHPQ GLAPFFSLNW GAYAQNPDSL 

       250        260        270        280        290        300 
DAVFGTSQGA GTAIFTFLGG LHPQSESLWL TDIAHHHLAI GVMFIIAGHM YRNTFGIGHT 

       310        320        330        340        350        360 
LKEITEAHNT DNPNDPHTTA KDGRHFGVNH NGIFETVNNS LHFQLGLALA SLGAACSLVA 

       370        380        390        400        410        420 
QHMGALPSYA FIARDYTTQS ALYTHHQYIA MFLMVGAFSH GAIFFVRDYD PELNKGNVLA 

       430        440        450        460        470        480 
RVLETKEALI SHLSWVTMLL GFHTLGIYVH NDVVVAFGNP EKQILVEPVF AQAIQAFSGK 

       490        500        510        520        530        540 
VMYGINALLA NANSSATLAA NSMPGNHYWM DMINRQDALT NFLPIGPADF LVHHAIALGL 

       550        560        570        580        590        600 
HTTALILIKG ALDARGSKLI PDKKDFGYAF PCDGPGRGGT CDSSAWDATY LAMFWALNTI 

       610        620        630        640        650        660 
AWITFYWHWK HLAIWQGNVA QFNESGTYLM GWFRDYLWLN SSQLINGYNP FGVNALSPWA 

       670        680        690        700        710        720 
WMFLFGHLIW ATGFMFLISW RGYWQELIET LVWAHQRTPI ANLVGWRDKP VALSIVQARL 

       730        740 
VGLTHFTVGN FVTFGAFVIA STSGKFG

« Hide

References

	« Hide 'large scale' referencesShow 'large scale' references »
[1]	"Rapid evolutionary divergence of photosystem I core subunits PsaA and PsaB in the marine prokaryote Prochlorococcus." van der Staay G.W.M., Moon-van der Staay S.Y., Garczarek L., Partensky F. Photosyn. Res. 65:131-139(2000) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]. Strain: SARG / CCMP1375 / SS120.
[2]	"Genome sequence of the cyanobacterium Prochlorococcus marinus SS120, a nearly minimal oxyphototrophic genome." Dufresne A., Salanoubat M., Partensky F., Artiguenave F., Axmann I.M., Barbe V., Duprat S., Galperin M.Y., Koonin E.V., Le Gall F., Makarova K.S., Ostrowski M., Oztas S., Robert C., Rogozin I.B., Scanlan D.J., Tandeau de Marsac N., Weissenbach J. , Wincker P., Wolf Y.I., Hess W.R. Proc. Natl. Acad. Sci. U.S.A. 100:10020-10025(2003) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: SARG / CCMP1375 / SS120.

Cross-references

Sequence databases
EMBL GenBank DDBJ	AJ133192 Genomic DNA. Translation: CAB64199.1. AE017126 Genomic DNA. Translation: AAQ00717.1.
RefSeq	NP_876064.1. NC_005042.1.
3D structure databases
ProteinModelPortal	Q9RDV0.
SMR	Q9RDV0. Positions 2-746.
ModBase	Search...
Protein-protein interaction databases
STRING	167539.Pro1673.
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Genome annotation databases
EnsemblBacteria	AAQ00717; AAQ00717; Pro_1673.
GeneID	1463055.
KEGG	pma:Pro1673.
PATRIC	23030173. VBIProMar8617_1767.
Phylogenomic databases
eggNOG	NOG04867.
KO	K02690.
OMA	AQFNESS.
ProtClustDB	PRK13199.
Enzyme and pathway databases
BioCyc	PMAR167539:GJN2-1710-MONOMER.
Family and domain databases
Gene3D	1.20.1130.10. 1 hit.
HAMAP	MF_00482. PSI_PsaB.
InterPro	IPR001280. PSI_PsaA/B. IPR020586. PSI_PsaA/B_CS. IPR006244. PSI_PsaB. [Graphical view]
Pfam	PF00223. PsaA_PsaB. 1 hit. [Graphical view]
PIRSF	PIRSF002905. PSI_A. 1 hit.
PRINTS	PR00257. PHOTSYSPSAAB.
TIGRFAMs	TIGR01336. psaB. 1 hit.
PROSITE	PS00419. PHOTOSYSTEM_I_PSAAB. 1 hit. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

PSAB_PROMA

Accession

Primary (citable) accession number: Q9RDV0

Entry history

Integrated into UniProtKB/Swiss-Prot:	November 16, 2001
Last sequence update:	May 1, 2000
Last modified:	May 1, 2013
This is version 91 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program

Relevant documents

SIMILARITY comments

Index of protein domains and families

Names·Attributes·General annotation·Ontologies·Sequence annotation·Sequences·References·Cross-refs·Entry info·Documents

Preferred order of sections

Names and origin

Protein attributes

General annotation (Comments)

Ontologies

Sequence annotation (Features)

Molecule processing

Regions

Sites

Sequences

References

Cross-references

Sequence databases

3D structure databases

Protein-protein interaction databases

Protocols and materials databases

Genome annotation databases

Phylogenomic databases

Enzyme and pathway databases

Family and domain databases

Entry information

Relevant documents