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A2BYP8

- PSAB_PROM5

UniProt

A2BYP8 - PSAB_PROM5

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Protein
Photosystem I P700 chlorophyll a apoprotein A2
Gene
psaB, P9515_17021
Organism
Prochlorococcus marinus (strain MIT 9515)
Status
Reviewed - Annotation score: 3 out of 5 - Protein inferred from homologyi

Functioni

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.UniRule annotation

Catalytic activityi

Reduced plastocyanin + oxidized ferredoxin + light = oxidized plastocyanin + reduced ferredoxin.UniRule annotation

Cofactori

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.

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Metal bindingi567 – 5671Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal bindingi576 – 5761Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal bindingi662 – 6621Magnesium (divinyl chlorophyll-a B1 axial ligand; P700 special pair) By similarity
Metal bindingi670 – 6701Magnesium (divinyl chlorophyll-a B3 axial ligand) By similarity
Binding sitei678 – 6781Divinyl chlorophyll-a B3 By similarity
Binding sitei679 – 6791Phylloquinone B By similarity

GO - Molecular functioni

  1. 4 iron, 4 sulfur cluster binding Source: UniProtKB-KW
  2. chlorophyll binding Source: UniProtKB-KW
  3. electron carrier activity Source: UniProtKB-HAMAP
  4. magnesium ion binding Source: UniProtKB-HAMAP
  5. oxidoreductase activity Source: UniProtKB-KW

GO - Biological processi

  1. photosynthesis Source: UniProtKB-HAMAP
  2. protein-chromophore linkage Source: UniProtKB-KW
Complete GO annotation...

Keywords - Molecular functioni

Oxidoreductase

Keywords - Biological processi

Electron transport, Photosynthesis, Transport

Keywords - Ligandi

4Fe-4S, Chlorophyll, Chromophore, Iron, Iron-sulfur, Magnesium, Metal-binding

Enzyme and pathway databases

BioCyciPMAR167542:GI3N-1750-MONOMER.

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem I P700 chlorophyll a apoprotein A2 (EC:1.97.1.12)
Alternative name(s):
PsaB
Gene namesi
Name:psaB
Ordered Locus Names:P9515_17021
OrganismiProchlorococcus marinus (strain MIT 9515)
Taxonomic identifieri167542 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaProchloralesProchlorococcaceaeProchlorococcus
ProteomesiUP000001589: Chromosome

Subcellular locationi

Topology

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei46 – 6924Helical; Name=I; Reviewed prediction
Add
BLAST
Transmembranei135 – 15824Helical; Name=II; Reviewed prediction
Add
BLAST
Transmembranei175 – 19925Helical; Name=III; Reviewed prediction
Add
BLAST
Transmembranei273 – 29119Helical; Name=IV; Reviewed prediction
Add
BLAST
Transmembranei336 – 35924Helical; Name=V; Reviewed prediction
Add
BLAST
Transmembranei375 – 40127Helical; Name=VI; Reviewed prediction
Add
BLAST
Transmembranei423 – 44523Helical; Name=VII; Reviewed prediction
Add
BLAST
Transmembranei525 – 54319Helical; Name=VIII; Reviewed prediction
Add
BLAST
Transmembranei583 – 60422Helical; Name=IX; Reviewed prediction
Add
BLAST
Transmembranei651 – 67323Helical; Name=X; Reviewed prediction
Add
BLAST
Transmembranei715 – 73521Helical; Name=XI; Reviewed prediction
Add
BLAST

GO - Cellular componenti

  1. integral component of membrane Source: UniProtKB-KW
  2. photosystem I Source: UniProtKB-KW
  3. thylakoid membrane Source: UniProtKB-SubCell
Complete GO annotation...

Keywords - Cellular componenti

Membrane, Photosystem I, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 742742Photosystem I P700 chlorophyll a apoprotein A2UniRule annotation
PRO_0000300020Add
BLAST

Interactioni

Subunit structurei

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.

Protein-protein interaction databases

STRINGi167542.P9515_17021.

Structurei

3D structure databases

ProteinModelPortaliA2BYP8.
SMRiA2BYP8. Positions 2-741.

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

eggNOGiNOG04867.
HOGENOMiHOG000276868.
KOiK02690.
OMAiAQFNESS.
OrthoDBiEOG60W7PS.

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00482. PSI_PsaB.
InterProiIPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
IPR006244. PSI_PsaB.
[Graphical view]
PfamiPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFiPIRSF002905. PSI_A. 1 hit.
PRINTSiPR00257. PHOTSYSPSAAB.
SUPFAMiSSF81558. SSF81558. 1 hit.
TIGRFAMsiTIGR01336. psaB. 1 hit.
PROSITEiPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

A2BYP8-1 [UniParc]FASTAAdd to Basket

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MATKFPAFNQ GLAQDPTTRR IWYGIATAHD FESHDGMTEE KLYQKLFSTH    50
FGHLAIIALW VAGNLFHIAW QGNFEQFVLD PTHVRPIAHA IWDPHFGSGI 100
TEAMTQAGAD GPVNIAYSGL YHWWYTIGMR TNEQLFQASI FMSILACWTL 150
FAGWLHLQPK FRPSLAWFKN NESRLNHHLA VLFGFSSIAW TGHLVHVAIP 200
ESRGIHVGWD NWLTVLPHPA GLTPFFTLNW GAYAQNPDSL EQVFGTAEGA 250
GTAIFTFLGG LHPQSEALWL TDIAHHHIAI GTVFIIAGHM YRNTFGIGHS 300
LKEITEAHNT RHPLDPHKGS FGINHDGLYE TVTNSLHFQL GLALAALGVA 350
TSLVAQHMGA LPSYAFIARD YTTQSALYTH HQYIAMFLMV GAFAHGAIFF 400
VRDYDPELNK DNVLARVLGT KEALISHLSW VTMILGFHTL GIYVHNDVVV 450
AFGNPEKQIL IEPVFAQFVQ AAQGKMMYGF NALLSDPTSA ASVAANSLPG 500
NHYWMDLINR QDALSAFLPI GPADFLVHHA IALGLHTTAL ILIKGALDAR 550
GTKLIPDKKD LGYAFPCDGP GRGGTCDSSS WDAMYLAMFW ALNLIAWVTF 600
YWHWKHLAIW QGNVAQFNES GTYLMGWFRD YLWLNSAQLI NGYNPFGVNS 650
LSVWAWMFLF GHLVWATGFM FLISWRGYWQ ELIETLVWAH QRTPIANLVG 700
WRDKPVALSI VQARLVGLAH FTIGNILTFG AFVIASTSGK FG 742
Length:742
Mass (Da):82,725
Last modified:February 20, 2007 - v1
Checksum:iAE4A8A399874CA7C
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP000552 Genomic DNA. Translation: ABM72909.1.
RefSeqiWP_011821001.1. NC_008817.1.
YP_001012016.1. NC_008817.1.

Genome annotation databases

EnsemblBacteriaiABM72909; ABM72909; P9515_17021.
GeneIDi4720211.
KEGGipmc:P9515_17021.
PATRICi23017076. VBIProMar113831_1750.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP000552 Genomic DNA. Translation: ABM72909.1 .
RefSeqi WP_011821001.1. NC_008817.1.
YP_001012016.1. NC_008817.1.

3D structure databases

ProteinModelPortali A2BYP8.
SMRi A2BYP8. Positions 2-741.
ModBasei Search...
MobiDBi Search...

Protein-protein interaction databases

STRINGi 167542.P9515_17021.

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

EnsemblBacteriai ABM72909 ; ABM72909 ; P9515_17021 .
GeneIDi 4720211.
KEGGi pmc:P9515_17021.
PATRICi 23017076. VBIProMar113831_1750.

Phylogenomic databases

eggNOGi NOG04867.
HOGENOMi HOG000276868.
KOi K02690.
OMAi AQFNESS.
OrthoDBi EOG60W7PS.

Enzyme and pathway databases

BioCyci PMAR167542:GI3N-1750-MONOMER.

Family and domain databases

Gene3Di 1.20.1130.10. 1 hit.
HAMAPi MF_00482. PSI_PsaB.
InterProi IPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
IPR006244. PSI_PsaB.
[Graphical view ]
Pfami PF00223. PsaA_PsaB. 1 hit.
[Graphical view ]
PIRSFi PIRSF002905. PSI_A. 1 hit.
PRINTSi PR00257. PHOTSYSPSAAB.
SUPFAMi SSF81558. SSF81558. 1 hit.
TIGRFAMsi TIGR01336. psaB. 1 hit.
PROSITEi PS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view ]
ProtoNeti Search...

Publicationsi

  1. Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
    Strain: MIT 9515.

Entry informationi

Entry nameiPSAB_PROM5
AccessioniPrimary (citable) accession number: A2BYP8
Entry historyi
Integrated into UniProtKB/Swiss-Prot: September 11, 2007
Last sequence update: February 20, 2007
Last modified: September 3, 2014
This is version 57 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

External Data

Dasty 3

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