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A2C4V4 (PSAB_PROM1) Reviewed, UniProtKB/Swiss-Prot

Last modified April 16, 2014. Version 56. Feed History...

Clusters with 100%, 90%, 50% identity | Documents (1) | Third-party data text xml rdf/xml gff fasta
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Names and origin

Protein namesRecommended name:
Photosystem I P700 chlorophyll a apoprotein A2

EC=1.97.1.12
Alternative name(s):
PsaB
Gene names
Name:psaB
Ordered Locus Names:NATL1_19581
OrganismProchlorococcus marinus (strain NATL1A) [Complete proteome] [HAMAP]
Taxonomic identifier167555 [NCBI]
Taxonomic lineageBacteriaCyanobacteriaProchloralesProchlorococcaceaeProchlorococcus

Protein attributes

Sequence length742 AA.
Sequence statusComplete.
Protein existenceInferred 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.

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifier

Molecule processing

Chain1 – 742742Photosystem I P700 chlorophyll a apoprotein A2 HAMAP-Rule MF_00482
PRO_0000300021

Regions

Transmembrane46 – 6924Helical; Name=I; Potential
Transmembrane135 – 15824Helical; Name=II; Potential
Transmembrane175 – 19925Helical; Name=III; Potential
Transmembrane273 – 29119Helical; Name=IV; Potential
Transmembrane336 – 35924Helical; Name=V; Potential
Transmembrane375 – 40127Helical; Name=VI; Potential
Transmembrane423 – 44523Helical; Name=VII; Potential
Transmembrane525 – 54319Helical; Name=VIII; Potential
Transmembrane583 – 60422Helical; Name=IX; Potential
Transmembrane651 – 67323Helical; Name=X; Potential
Transmembrane715 – 73521Helical; Name=XI; Potential

Sites

Metal binding5671Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding5761Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding6621Magnesium (divinyl chlorophyll-a B1 axial ligand; P700 special pair) By similarity
Metal binding6701Magnesium (divinyl chlorophyll-a B3 axial ligand) By similarity
Binding site6781Divinyl chlorophyll-a B3 By similarity
Binding site6791Phylloquinone B By similarity

Sequences

Sequence LengthMass (Da)Tools
A2C4V4 [UniParc].

Last modified February 20, 2007. Version 1.
Checksum: EDEDEFBE1CD80364

FASTA74282,846
        10         20         30         40         50         60 
MATKFPSFSQ GLAQDPTTRR IWYGIATAHD FESHDGMTEE QLYQKLFSTH FGHLAIIGLW 

        70         80         90        100        110        120 
VAGNLFHIAW QGNFEQWVLD PLHTRPIAHA IWDPHFGQGL TDALTQAGAT SPVNIAYSGL 

       130        140        150        160        170        180 
YHWWYTIGMR TNEQLFQGAI FINILVCWLL FAGWLHLQPK YRPSLAWFKN AESQLNHHLA 

       190        200        210        220        230        240 
VLFGFSSIAW TGHLIHVAIP ESRGIHVGWE NWLTVMPHPE GLTPFFSGNW GAYAQNPDSI 

       250        260        270        280        290        300 
DAVFGTSQGA GTAIFTFLGG LHPQSESLWL TDIAHHHLAI GVVFIIAGHM YRTNFGIGHS 

       310        320        330        340        350        360 
LKEIIEAHNT SHPKDPHRGY FGIKHNGLFE TVNNSLHFQL GLALASLGVA CSLVAQHMGA 

       370        380        390        400        410        420 
LPSYAFIARD YTTQSALYTH HQYIAMFLMV GAFSHGAIFF VRDYDPELNK DNVLARILST 

       430        440        450        460        470        480 
KEALISHLSW VTMLLGFHTL GIYVHNDVVV AFGTPEKQIL IEPVFAQFAQ AASGKMMYGF 

       490        500        510        520        530        540 
NALLANASSS ASIAANSMPG NHYWMDMINR PDALTNFLPI GPADFLVHHA IALGLHTTAL 

       550        560        570        580        590        600 
ILIKGALDAR GTKLIPDKKD LGFAFPCDGP GRGGTCDSSS WDATYLAMFW ALNTIAWITF 

       610        620        630        640        650        660 
YWHWKHLAIW MGNTAQFNES GTYLMGWFRD YLWLNSSQLI NGYNPFGVNA LSPWAWMFLF 

       670        680        690        700        710        720 
GHLIWATGFM FLISWRGYWQ ELIETLVWAH QRTPIANLVG WRDKPVALSI VQARLVGLTH 

       730        740 
FTVGNFVTFG AFVIASTSGK FG 

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References

[1]"Patterns and implications of gene gain and loss in the evolution of Prochlorococcus."
Kettler G.C., Martiny A.C., Huang K., Zucker J., Coleman M.L., Rodrigue S., Chen F., Lapidus A., Ferriera S., Johnson J., Steglich C., Church G.M., Richardson P., Chisholm S.W.
PLoS Genet. 3:2515-2528(2007) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
Strain: NATL1A.

Cross-references

Sequence databases

EMBL
GenBank
DDBJ
CP000553 Genomic DNA. Translation: ABM76514.1.
RefSeqYP_001015778.1. NC_008819.1.

3D structure databases

ProteinModelPortalA2C4V4.
SMRA2C4V4. Positions 2-741.
ModBaseSearch...
MobiDBSearch...

Protein-protein interaction databases

STRING167555.NATL1_19581.

Protocols and materials databases

StructuralBiologyKnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaABM76514; ABM76514; NATL1_19581.
GeneID4779256.
KEGGpme:NATL1_19581.
PATRIC23021571. VBIProMar31285_1999.

Organism-specific databases

CMRSearch...

Phylogenomic databases

eggNOGNOG04867.
HOGENOMHOG000276868.
KOK02690.
OMAAQFNESS.
OrthoDBEOG60W7PS.
ProtClustDBPRK13199.

Enzyme and pathway databases

BioCycPMAR167555:GI3K-1999-MONOMER.

Family and domain databases

Gene3D1.20.1130.10. 1 hit.
HAMAPMF_00482. PSI_PsaB.
InterProIPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
IPR006244. PSI_PsaB.
[Graphical view]
PfamPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFPIRSF002905. PSI_A. 1 hit.
PRINTSPR00257. PHOTSYSPSAAB.
SUPFAMSSF81558. SSF81558. 1 hit.
TIGRFAMsTIGR01336. psaB. 1 hit.
PROSITEPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]
ProtoNetSearch...

Entry information

Entry namePSAB_PROM1
AccessionPrimary (citable) accession number: A2C4V4
Entry history
Integrated into UniProtKB/Swiss-Prot: September 11, 2007
Last sequence update: February 20, 2007
Last modified: April 16, 2014
This is version 56 of the entry and version 1 of the sequence. [Complete history]
Entry statusReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Relevant documents

SIMILARITY comments

Index of protein domains and families