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Protein

Photosystem I P700 chlorophyll a apoprotein A1

Gene

psaA

Organism
Prochlorococcus marinus (strain NATL1A)
Status
Reviewed-Annotation score: 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

Note: 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)DescriptionActionsGraphical viewLength
Metal bindingi601Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi610Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi693Magnesium (divinyl chlorophyll-a' A1 axial ligand; P700 special pair)UniRule annotation1
Metal bindingi701Magnesium (divinyl chlorophyll-a A3 axial ligand)UniRule annotation1
Binding sitei709Divinyl chlorophyll-a A3UniRule annotation1
Binding sitei710Phylloquinone AUniRule annotation1

GO - Molecular functioni

GO - Biological processi

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

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem I P700 chlorophyll a apoprotein A1UniRule annotation (EC:1.97.1.12UniRule annotation)
Alternative name(s):
PsaAUniRule annotation
Gene namesi
Name:psaAUniRule annotation
Ordered Locus Names:NATL1_19571
OrganismiProchlorococcus marinus (strain NATL1A)
Taxonomic identifieri167555 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaSynechococcalesProchloraceaeProchlorococcus
Proteomesi
  • UP000002592 Componenti: Chromosome

Subcellular locationi

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

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei76 – 99Helical; Name=IUniRule annotationAdd BLAST24
Transmembranei162 – 185Helical; Name=IIUniRule annotationAdd BLAST24
Transmembranei201 – 225Helical; Name=IIIUniRule annotationAdd BLAST25
Transmembranei310 – 328Helical; Name=IVUniRule annotationAdd BLAST19
Transmembranei369 – 392Helical; Name=VUniRule annotationAdd BLAST24
Transmembranei408 – 434Helical; Name=VIUniRule annotationAdd BLAST27
Transmembranei456 – 478Helical; Name=VIIUniRule annotationAdd BLAST23
Transmembranei559 – 577Helical; Name=VIIIUniRule annotationAdd BLAST19
Transmembranei617 – 638Helical; Name=IXUniRule annotationAdd BLAST22
Transmembranei682 – 704Helical; Name=XUniRule annotationAdd BLAST23
Transmembranei742 – 762Helical; Name=XIUniRule annotationAdd BLAST21

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Membrane, Photosystem I, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00002942041 – 768Photosystem I P700 chlorophyll a apoprotein A1Add BLAST768

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

STRINGi167555.NATL1_19571.

Structurei

3D structure databases

ProteinModelPortaliA2C4V3.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

eggNOGiENOG4105MN0. Bacteria.
ENOG410XT0I. LUCA.
HOGENOMiHOG000276868.
KOiK02689.
OMAiMFLGAHF.
OrthoDBiPOG091H09L9.

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00458. PSI_PsaA. 1 hit.
InterProiIPR006243. PSI_PsaA.
IPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
[Graphical view]
PfamiPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFiPIRSF002905. PSI_A. 1 hit.
PRINTSiPR00257. PHOTSYSPSAAB.
SUPFAMiSSF81558. SSF81558. 1 hit.
TIGRFAMsiTIGR01335. psaA. 1 hit.
PROSITEiPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

A2C4V3-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MTISPPEKEQ KKEPVLDKPI ETDAIPVDFS KLDKPGFWSK SLAKGPKTTT
60 70 80 90 100
WIWNLHADAH DFDTHVGDLQ ETSRKVFSAH FGHLAVIFIW MSAAFFHGAR
110 120 130 140 150
FSNYSGWLSD PTHVKPGAQV VWPIVGQEML NADLGGNYHG IQITSGIFQM
160 170 180 190 200
WRGWGITNET ELMALAIGAL LMAAIMLHGG IYHYHKAAPK LDWFRNLESM
210 220 230 240 250
LNHHIAGLVG LGSIAWAGHC IHIGAPTAAL MDAIDAGKPL IIDGIPIASI
260 270 280 290 300
ADMPLPHELC NPAIASQIFP GLAGRTVENF FTTNWWAFSD FLTFKGGLNP
310 320 330 340 350
VTGSLWMTDI SHHHLAFGVL AVLGGHLYRT MFGIGHSLKE ILDNHAGDPI
360 370 380 390 400
LFPAPNGHKG IYEFLANSWH AQLGLNLAMI GSLSIIISHH MYAMPPYPYL
410 420 430 440 450
SIDYPTVLGL FTHHMWIGGL FIVGAAAHAG IAMIRDYDPA VHIDNVLDRI
460 470 480 490 500
LKARDALISH LNWACMFLGF HSFGLYIHND VMRALGRPAD MFSDTGIQLQ
510 520 530 540 550
PVFAQWIQNI HNSAAGSTTL AGANVNLQPG LVSEVFNGSV SQVGGKIGIA
560 570 580 590 600
PIPLGTADFM IHHIHAFTIH VTLLILLKGV LFARSSRLIP DKANLGFRFP
610 620 630 640 650
CDGPGRGGTC QVSSWDHVFL GLFWMYNGLS VVIFHFSWKM QSDVWGLTGG
660 670 680 690 700
NFAQSSITIN GWLRDFLWAQ SSQVLTSYGQ PISMYGLMFL GAHFVWAFSL
710 720 730 740 750
MFLFSGRGYW QELFESIIWA HNKLNLAPTI QPRALSITQG RAVGAAHFLL
760
GGIATTWAFF HARLIGLG
Length:768
Mass (Da):84,390
Last modified:February 20, 2007 - v1
Checksum:i5F51B544D4E4471E
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000553 Genomic DNA. Translation: ABM76513.1.
RefSeqiWP_011824482.1. NC_008819.1.

Genome annotation databases

EnsemblBacteriaiABM76513; ABM76513; NATL1_19571.
KEGGipme:NATL1_19571.
PATRICi23021569. VBIProMar31285_1998.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000553 Genomic DNA. Translation: ABM76513.1.
RefSeqiWP_011824482.1. NC_008819.1.

3D structure databases

ProteinModelPortaliA2C4V3.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi167555.NATL1_19571.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiABM76513; ABM76513; NATL1_19571.
KEGGipme:NATL1_19571.
PATRICi23021569. VBIProMar31285_1998.

Phylogenomic databases

eggNOGiENOG4105MN0. Bacteria.
ENOG410XT0I. LUCA.
HOGENOMiHOG000276868.
KOiK02689.
OMAiMFLGAHF.
OrthoDBiPOG091H09L9.

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00458. PSI_PsaA. 1 hit.
InterProiIPR006243. PSI_PsaA.
IPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
[Graphical view]
PfamiPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFiPIRSF002905. PSI_A. 1 hit.
PRINTSiPR00257. PHOTSYSPSAAB.
SUPFAMiSSF81558. SSF81558. 1 hit.
TIGRFAMsiTIGR01335. psaA. 1 hit.
PROSITEiPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiPSAA_PROM1
AccessioniPrimary (citable) accession number: A2C4V3
Entry historyi
Integrated into UniProtKB/Swiss-Prot: July 10, 2007
Last sequence update: February 20, 2007
Last modified: November 2, 2016
This is version 71 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

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.