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B8HLB1

- B8HLB1_CYAP4

UniProt

B8HLB1 - B8HLB1_CYAP4

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Protein

Photosystem I P700 chlorophyll a apoprotein A2

Gene
psaB, Cyan7425_4670
Organism
Cyanothece sp. (strain PCC 7425 / ATCC 29141)
Status
Unreviewed - Annotation score: 4 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
PsaA and psaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX By similarity.UniRule annotation

Catalytic activityi

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

Cofactori

PSI electron transfer chain: 5 chlorophyll a, 1 chlorophyll a', 2 phylloquinones and 3 4Fe-4S clusters. PSI core antenna: 90 chlorophyll a, 22 carotenoids, 3 phospholipids and 1 galactolipid. P700 is a chlorophyll a/chlorophyll a' dimer, A0 is one or more chlorophyll a, A1 is one or both phylloquinones and FX is a shared 4Fe-4S iron-sulfur center By similarity.UniRule annotation

Sites

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

OxidoreductaseUniRule annotation

Keywords - Biological processi

Electron transportUniRule annotation, Photosynthesis, Transport

Keywords - Ligandi

4Fe-4SUniRule annotation, ChlorophyllUniRule annotation, Chromophore, Iron, Iron-sulfur, MagnesiumUniRule annotation, Metal-binding

Enzyme and pathway databases

BioCyciCSP395961:GJDE-4516-MONOMER.

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem I P700 chlorophyll a apoprotein A2UniRule annotation (EC:1.97.1.12UniRule annotation)
Alternative name(s):
PsaB
Gene namesi
Name:psaBUniRule annotation
Ordered Locus Names:Cyan7425_4670Imported
OrganismiCyanothece sp. (strain PCC 7425 / ATCC 29141)Imported
Taxonomic identifieri395961 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaOscillatoriophycideaeChroococcalesCyanothece
ProteomesiUP000002511: Chromosome

Subcellular locationi

Membrane; Multi-pass membrane protein By similarity UniRule annotation

Topology

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei39 – 7032Helical; Name=I By similarityUniRule annotationAdd
BLAST
Transmembranei132 – 15625Helical; Name=II By similarityUniRule annotationAdd
BLAST
Transmembranei173 – 19523Helical; Name=III By similarityUniRule annotationAdd
BLAST
Transmembranei270 – 28718Helical; Name=IV By similarityUniRule annotationAdd
BLAST
Transmembranei336 – 35924Helical; Name=V By similarityUniRule annotationAdd
BLAST
Transmembranei370 – 40132Helical; Name=VI By similarityUniRule annotationAdd
BLAST
Transmembranei421 – 45030Helical; Name=VII By similarityUniRule annotationAdd
BLAST
Transmembranei522 – 54625Helical; Name=VIII By similarityUniRule annotationAdd
BLAST
Transmembranei580 – 61132Helical; Name=IX By similarityUniRule annotationAdd
BLAST
Transmembranei652 – 67322Helical; Name=X By similarityUniRule annotationAdd
BLAST
Transmembranei710 – 73829Helical; Name=XI By similarityUniRule annotationAdd
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 IUniRule annotation, ThylakoidUniRule annotation

Interactioni

Subunit structurei

The PsaA/B heterodimer binds the P700 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.UniRule annotation

Protein-protein interaction databases

STRINGi395961.Cyan7425_4670.

Family & Domainsi

Sequence similaritiesi

Keywords - Domaini

Transmembrane, Transmembrane helixUniRule annotation

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.

B8HLB1-1 [UniParc]FASTAAdd to Basket

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MATRFPKFSQ DLAQDPTTRR IWYAIATAHD FESHDGMTEE NLYQKIFASH    50
FGHLAIIFLW TSGSLFHVAW QGNFEQWIKD PLNIRPIAHA IWDPQFGKPA 100
VDAFTQAGAS SPVDIAYSGV YHWWYTIGMR TNSDLYMGAI TLLLFAAVFL 150
FAGWLHLQPK FRPSLAWFKN AESRLNHHLA GLFGVSSLAW AGHLIHVAIP 200
EARGQHVGWD NFLSTMPHPA GLAPFFTGNW GVYAQNPDTA GHVFGTSEGA 250
GTAILTFLGG FHPQTESLWL TDIAHHHLAI AVIFIIAGHM YRTNFGIGHS 300
MKEIMNAHNP PQGTPFGGML GAGHQGMYDT YNNSLHFQLG WHLACLGVVT 350
SLVAQHMYSL PPYAFIAQDH TTMAALYTHH QYIAGFLMVG AFAHGAIFLV 400
RDYDPAANKN NVLARVLEHK EAIISHLSWV SLFLGFHTLG LYVHNDVVVA 450
FGTPEKQILI EPVFAQFIQA AHGKVLYGFD TLLSNPDSIA TTAWPNYGNV 500
WLPGWLDAIN SGTNSLFLTI GPGDFLVHHA IALGLHTTTL ILVKGALDAR 550
GSKLMPDKKD FGYAFPCDGP GRGGTCDISG WDAFYLSMFW MLNTIGWVTF 600
YWHWKHLGIW EGNVAQFNES STYLMGWLRD YLWLYSGPLI NGYNPFGMNN 650
LAVWSWMFLF GHLVWATGFM FLISWRGYWQ ELIETLVWAH ERTPLANLVR 700
WKDKPVALSI VQARLVGLAH FTVGYIVTYA AFLIASTAAK YG 742
Length:742
Mass (Da):82,907
Last modified:March 3, 2009 - v1
Checksum:i96B36B749D0A0B07
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP001344 Genomic DNA. Translation: ACL46976.1.
RefSeqiWP_012630018.1. NC_011884.1.
YP_002485337.1. NC_011884.1.

Genome annotation databases

EnsemblBacteriaiACL46976; ACL46976; Cyan7425_4670.
GeneIDi7290623.
KEGGicyn:Cyan7425_4670.
PATRICi21570339. VBICyaSp30657_4659.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP001344 Genomic DNA. Translation: ACL46976.1 .
RefSeqi WP_012630018.1. NC_011884.1.
YP_002485337.1. NC_011884.1.

3D structure databases

ModBasei Search...
MobiDBi Search...

Protein-protein interaction databases

STRINGi 395961.Cyan7425_4670.

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

EnsemblBacteriai ACL46976 ; ACL46976 ; Cyan7425_4670 .
GeneIDi 7290623.
KEGGi cyn:Cyan7425_4670.
PATRICi 21570339. VBICyaSp30657_4659.

Phylogenomic databases

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

Enzyme and pathway databases

BioCyci CSP395961:GJDE-4516-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. "Novel metabolic attributes of the genus Cyanothece, comprising a group of unicellular nitrogen-fixing Cyanobacteria."
    Bandyopadhyay A., Elvitigala T., Welsh E., Stockel J., Liberton M., Min H., Sherman L.A., Pakrasi H.B.
    MBio 2:E214-E214(2011) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
    Strain: PCC 7425 / ATCC 29141.

Entry informationi

Entry nameiB8HLB1_CYAP4
AccessioniPrimary (citable) accession number: B8HLB1
Entry historyi
Integrated into UniProtKB/TrEMBL: March 3, 2009
Last sequence update: March 3, 2009
Last modified: September 3, 2014
This is version 44 of the entry and version 1 of the sequence. [Complete history]
Entry statusiUnreviewed (UniProtKB/TrEMBL)

Miscellaneousi

Keywords - Technical termi

Complete proteome

External Data

Dasty 3

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