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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

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.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.UniRule annotation

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Metal bindingi567 – 5671Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
Metal bindingi576 – 5761Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
Metal bindingi662 – 6621Magnesium (divinyl chlorophyll-a B1 axial ligand; P700 special pair)UniRule annotation
Metal bindingi670 – 6701Magnesium (divinyl chlorophyll-a B3 axial ligand)UniRule annotation
Binding sitei678 – 6781Divinyl chlorophyll-a B3UniRule annotation
Binding sitei679 – 6791Phylloquinone BUniRule annotation

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 A2UniRule annotation (EC:1.97.1.12UniRule annotation)
Alternative name(s):
PsaBUniRule annotation
Gene namesi
Name:psaBUniRule annotation
Ordered Locus Names:P9515_17021
OrganismiProchlorococcus marinus (strain MIT 9515)
Taxonomic identifieri167542 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaProchloralesProchlorococcaceaeProchlorococcus
ProteomesiUP000001589: Chromosome

Subcellular locationi

Cellular thylakoid membrane UniRule annotation; Multi-pass membrane protein UniRule annotation

GO - Cellular componenti

  1. integral component of membrane Source: UniProtKB-KW
  2. photosystem I Source: UniProtKB-KW
  3. thylakoid membrane Source: UniProtKB-HAMAP
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 A2PRO_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.UniRule annotation

Protein-protein interaction databases

STRINGi167542.P9515_17021.

Structurei

3D structure databases

ProteinModelPortaliA2BYP8.
SMRiA2BYP8. Positions 2-741.
ModBaseiSearch...
MobiDBiSearch...

Transmembrane

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei46 – 6924Helical; Name=IUniRule annotationAdd
BLAST
Transmembranei135 – 15824Helical; Name=IIUniRule annotationAdd
BLAST
Transmembranei175 – 19925Helical; Name=IIIUniRule annotationAdd
BLAST
Transmembranei273 – 29119Helical; Name=IVUniRule annotationAdd
BLAST
Transmembranei336 – 35924Helical; Name=VUniRule annotationAdd
BLAST
Transmembranei375 – 40127Helical; Name=VIUniRule annotationAdd
BLAST
Transmembranei423 – 44523Helical; Name=VIIUniRule annotationAdd
BLAST
Transmembranei525 – 54319Helical; Name=VIIIUniRule annotationAdd
BLAST
Transmembranei583 – 60422Helical; Name=IXUniRule annotationAdd
BLAST
Transmembranei651 – 67323Helical; Name=XUniRule annotationAdd
BLAST
Transmembranei715 – 73521Helical; Name=XIUniRule annotationAdd
BLAST

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.UniRule annotation

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 [UniParc]FASTAAdd to Basket

« Hide

        10         20         30         40         50
MATKFPAFNQ GLAQDPTTRR IWYGIATAHD FESHDGMTEE KLYQKLFSTH
60 70 80 90 100
FGHLAIIALW VAGNLFHIAW QGNFEQFVLD PTHVRPIAHA IWDPHFGSGI
110 120 130 140 150
TEAMTQAGAD GPVNIAYSGL YHWWYTIGMR TNEQLFQASI FMSILACWTL
160 170 180 190 200
FAGWLHLQPK FRPSLAWFKN NESRLNHHLA VLFGFSSIAW TGHLVHVAIP
210 220 230 240 250
ESRGIHVGWD NWLTVLPHPA GLTPFFTLNW GAYAQNPDSL EQVFGTAEGA
260 270 280 290 300
GTAIFTFLGG LHPQSEALWL TDIAHHHIAI GTVFIIAGHM YRNTFGIGHS
310 320 330 340 350
LKEITEAHNT RHPLDPHKGS FGINHDGLYE TVTNSLHFQL GLALAALGVA
360 370 380 390 400
TSLVAQHMGA LPSYAFIARD YTTQSALYTH HQYIAMFLMV GAFAHGAIFF
410 420 430 440 450
VRDYDPELNK DNVLARVLGT KEALISHLSW VTMILGFHTL GIYVHNDVVV
460 470 480 490 500
AFGNPEKQIL IEPVFAQFVQ AAQGKMMYGF NALLSDPTSA ASVAANSLPG
510 520 530 540 550
NHYWMDLINR QDALSAFLPI GPADFLVHHA IALGLHTTAL ILIKGALDAR
560 570 580 590 600
GTKLIPDKKD LGYAFPCDGP GRGGTCDSSS WDAMYLAMFW ALNLIAWVTF
610 620 630 640 650
YWHWKHLAIW QGNVAQFNES GTYLMGWFRD YLWLNSAQLI NGYNPFGVNS
660 670 680 690 700
LSVWAWMFLF GHLVWATGFM FLISWRGYWQ ELIETLVWAH QRTPIANLVG
710 720 730 740
WRDKPVALSI VQARLVGLAH FTIGNILTFG AFVIASTSGK FG
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.
RefSeqiYP_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 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: October 29, 2014
This is version 59 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