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Q46IV5

- PSAB_PROMT

UniProt

Q46IV5 - PSAB_PROMT

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Protein
Photosystem I P700 chlorophyll a apoprotein A2
Gene
psaB, PMN2A_1083
Organism
Prochlorococcus marinus (strain NATL2A)
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
Complete GO annotation...

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

BioCyciPMAR59920:GI1O-1962-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:PMN2A_1083
OrganismiProchlorococcus marinus (strain NATL2A)
Taxonomic identifieri59920 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaProchloralesProchlorococcaceaeProchlorococcus
ProteomesiUP000002535: 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_0000300022Add
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

STRINGi59920.PMN2A_1083.

Structurei

3D structure databases

ProteinModelPortaliQ46IV5.
SMRiQ46IV5. 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.
PhylomeDBiQ46IV5.

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.

Q46IV5-1 [UniParc]FASTAAdd to Basket

« Hide

MATKFPSFSQ GLAQDPTTRR IWYGIATAHD FESHDGMTEE QLYQKLFSTH    50
FGHLAIIGLW VAGNLFHIAW QGNFEQWVLD PLHTRPIAHA IWDPHFGQGL 100
TDALTQAGAT SPVNIAYSGL YHWWYTIGMR TNEQLFQGAI FINILVCWLL 150
FAGWLHLQPK YRPSLAWFKN AESQLNHHLA VLFGFSSIAW TGHLIHVAIP 200
ESRGIHVGWE NWLTVMPHPE GLTPFFSGNW GAYAQNPDSI DAVFGTSQGA 250
GTAIFTFLGG LHPQSESLWL TDIAHHHLAI GVVFIIAGHM YRTNFGIGHS 300
LKEIIEAHNT SHPKDPHRGY FGIKHNGLFE TVNNSLHFQL GLALASLGVA 350
CSLVAQHMGA LPSYAFIARD YTTQSALYTH HQYIAMFLMV GAFSHGAIFF 400
VRDYDPELNK DNVLARILST KEALISHLSW VTMLLGFHTL GIYVHNDVVV 450
AFGTPEKQIL IEPVFAQFAQ AASGKMMYGF NALLANASSS ASIAANSMPG 500
NHYWMDMINR PDALTNFLPI GPADFLVHHA IALGLHTTAL ILIKGALDAR 550
GTKLIPDKKD LGFAFPCDGP GRGGTCDSSS WDATYLAMFW ALNTIAWITF 600
YWHWKHLAIW MGNTAQFNES GTYLMGWFRD YLWLNSSQLI NGYNPFGVNA 650
LSPWAWMFLF GHLIWATGFM FLISWRGYWQ ELIETLVWAH QRTPIANLVG 700
WRDKPVALSI VQARLVGLTH FTVGNFVTFG AFVIASTSGK FG 742
Length:742
Mass (Da):82,846
Last modified:September 13, 2005 - v1
Checksum:iEDEDEFBE1CD80364
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP000095 Genomic DNA. Translation: AAZ58573.1.
RefSeqiWP_011295427.1. NC_007335.2.
YP_292276.1. NC_007335.2.

Genome annotation databases

EnsemblBacteriaiAAZ58573; AAZ58573; PMN2A_1083.
GeneIDi3606470.
KEGGipmn:PMN2A_1083.
PATRICi23026027. VBIProMar14922_1940.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP000095 Genomic DNA. Translation: AAZ58573.1 .
RefSeqi WP_011295427.1. NC_007335.2.
YP_292276.1. NC_007335.2.

3D structure databases

ProteinModelPortali Q46IV5.
SMRi Q46IV5. Positions 2-741.
ModBasei Search...

Protein-protein interaction databases

STRINGi 59920.PMN2A_1083.

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

EnsemblBacteriai AAZ58573 ; AAZ58573 ; PMN2A_1083 .
GeneIDi 3606470.
KEGGi pmn:PMN2A_1083.
PATRICi 23026027. VBIProMar14922_1940.

Phylogenomic databases

eggNOGi NOG04867.
HOGENOMi HOG000276868.
KOi K02690.
OMAi AQFNESS.
OrthoDBi EOG60W7PS.
PhylomeDBi Q46IV5.

Enzyme and pathway databases

BioCyci PMAR59920:GI1O-1962-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: NATL2A.

Entry informationi

Entry nameiPSAB_PROMT
AccessioniPrimary (citable) accession number: Q46IV5
Entry historyi
Integrated into UniProtKB/Swiss-Prot: September 11, 2007
Last sequence update: September 13, 2005
Last modified: September 3, 2014
This is version 65 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

Similar proteinsi