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P56767 (PSAB_ARATH) Reviewed, UniProtKB/Swiss-Prot

Last modified January 25, 2012. Version 83. Feed History...

Clusters with 100%, 90%, 50% identity | Documents (2) | 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):
PSI-B
PsaB
Gene names
Name:psaB
Ordered Locus Names:AtCg00340
Encoded onPlastid; Chloroplast
OrganismArabidopsis thaliana (Mouse-ear cress)
Taxonomic identifier3702 [NCBI]
Taxonomic lineageEukaryota › Viridiplantae › Streptophyta › Embryophyta › Tracheophyta › Spermatophyta › Magnoliophyta › eudicotyledons › core eudicotyledons › rosids › malvids › Brassicales › Brassicaceae › Camelineae › Arabidopsis

Protein attributes

Sequence length734 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-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. HAMAP MF_00482

Catalytic activity

Reduced plastocyanin + oxidized ferredoxin + light = oxidized plastocyanin + reduced ferredoxin. HAMAP MF_00482

Cofactor

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.

Subunit structure

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 eukaryotic PSI reaction center is composed of at least 11 subunits By similarity.

Subcellular location

Plastid › chloroplast thylakoid membrane; Multi-pass membrane protein By similarity HAMAP MF_00482.

Sequence similarities

Belongs to the psaA/psaB family.

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifier

Molecule processing

Chain1 – 734734Photosystem I P700 chlorophyll a apoprotein A2 HAMAP MF_00482
PRO_0000088604

Regions

Transmembrane46 – 6924Helical; Name=I; Potential
Transmembrane135 – 15824Helical; Name=II; Potential
Transmembrane175 – 19925Helical; Name=III; Potential
Transmembrane273 – 29119Helical; Name=IV; Potential
Transmembrane330 – 35324Helical; Name=V; Potential
Transmembrane369 – 39527Helical; Name=VI; Potential
Transmembrane417 – 43923Helical; Name=VII; Potential
Transmembrane517 – 53519Helical; Name=VIII; Potential
Transmembrane575 – 59622Helical; Name=IX; Potential
Transmembrane643 – 66523Helical; Name=X; Potential
Transmembrane707 – 72721Helical; Name=XI; Potential

Sites

Metal binding5591Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding5681Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding6541Magnesium (chlorophyll-a B1 axial ligand; P700 special pair) By similarity
Metal binding6621Magnesium (chlorophyll-a B3 axial ligand) By similarity
Binding site6701Chlorophyll-a B3 By similarity
Binding site6711Phylloquinone B By similarity

Sequences

Sequence LengthMass (Da)Tools
P56767 [UniParc].

Last modified May 30, 2000. Version 1.
Checksum: FD6A22BCBC6E37FC

FASTA73482,475
        10         20         30         40         50         60 
MALRFPRFSQ GLAQDPTTRR IWFGIATAHD FESHDDITEE RLYQNIFASH FGQLAIIFLW 

        70         80         90        100        110        120 
TSGNLFHVAW QGNFETWVQD PLHVRPIAHA IWDPHFGQPA VEAFTRGGAL GPVNIAYSGV 

       130        140        150        160        170        180 
YQWWYTIGLR TNEDLYTGAL FLLFLSALSL IGGWLHLQPK WKPRVSWFKN AESRLNHHLS 

       190        200        210        220        230        240 
GLFGVSSLAW TGHLVHVAIP ASRGEYVRWN NFLNVLPHPQ GLGPLFTGQW NLYAQNPDSS 

       250        260        270        280        290        300 
SHLFGTSQGS GTAILTLLGG FHPQTQSLWL TDMAHHHLAI AILFLIAGHM YRTNFGIGHS 

       310        320        330        340        350        360 
IKDLLEAHIP PGGRLGRGHK GLYDTINNSI HFQLGLALAS LGVITSLVAQ HMYSLPAYAF 

       370        380        390        400        410        420 
IAQDFTTQAA LYTHHQYIAG FIMTGAFAHG AIFFIRDYNP EQNEDNVLAR MLDHKEAIIS 

       430        440        450        460        470        480 
HLSWASLFLG FHTLGLYVHN DVMLAFGTPE KQILIEPIFA QWIQSAHGKT SYGFDVLLSS 

       490        500        510        520        530        540 
TSGPAFNAGR SIWLPGWLNA INENSNSLFL TIGPGDFLVH HAIALGLHTT TLILVKGALD 

       550        560        570        580        590        600 
ARGSKLMPDK KDFGYSFPCD GPGRGGTCDI SAWDAFYLAV FWMLNTIGWV TFYWHWKHIT 

       610        620        630        640        650        660 
LWQGNVSQFN ESSTYLMGWL RDYLWLNSSQ LINGYNPFGM NSLSVWAWMF LFGHLVWATG 

       670        680        690        700        710        720 
FMFLISWRGY WQELIETLAW AHERTPLANL IRWKDKPVAL SIVQARLVGL AHFSVGYIFT 

       730 
YAAFLIASTS GKFG

« Hide

References

[1]"Complete structure of the chloroplast genome of Arabidopsis thaliana."
Sato S., Nakamura Y., Kaneko T., Asamizu E., Tabata S.
DNA Res. 6:283-290(1999) [PubMed: 10574454] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
Strain: cv. Columbia.
+Additional computationally mapped references.

Cross-references

Sequence databases

EMBL
GenBank
DDBJ		AP000423 Genomic DNA. Translation: BAA84384.1.
IPIIPI00516885.
RefSeqNP_051058.1. NC_000932.1.

3D structure databases

ProteinModelPortalP56767.
SMRP56767. Positions 2-734.
ModBaseSearch...

Protein-protein interaction databases

STRINGP56767.

Protein family/group databases

TCDB5.B.4.1.1. plant photosystem I supercomplex (PSI) family.

Proteomic databases

PRIDEP56767.

Protocols and materials databases

StructuralBiologyKnowledgebaseSearch...

Genome annotation databases

EnsemblPlantsATCG00340.1; ATCG00340.1; ATCG00340.
GeneID844770.
GenomeReviewsGene locus ATCG00340 in contig AP000423_GR.
KEGGath:ArthCp021.
NMPDRfig|3702.1.peg.20.

Organism-specific databases

TAIRAtCg00340.

Phylogenomic databases

eggNOGNOG04867.
GeneTreeEPGT00050000009337.
HOGENOMHBG284930.
PhylomeDBP56767.
ProtClustDBCHL00054.

Enzyme and pathway databases

BioCycMetaCyc:MONOMER-1100.

Gene expression databases

GenevestigatorP56767.
GermOnlineATCG00340. Arabidopsis thaliana.

Family and domain databases

HAMAPMF_00482. PSI_PsaB.
[Tree]
InterProIPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
IPR006244. PSI_PsaB.
[Graphical view]
Gene3DG3DSA:1.20.1130.10. PSI_PsaA/B. 1 hit.
KOK02690.
PfamPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFPIRSF002905. PSI_A. 1 hit.
PRINTSPR00257. PHOTSYSPSAAB.
TIGRFAMsTIGR01336. PsaB. 1 hit.
PROSITEPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]
ProtoNetSearch...

Entry information

Entry namePSAB_ARATH
AccessionPrimary (citable) accession number: P56767
Entry history
Integrated into UniProtKB/Swiss-Prot: May 30, 2000
Last sequence update: May 30, 2000
Last modified: January 25, 2012
This is version 83 of the entry and version 1 of the sequence. [Complete history]
Entry statusReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program

Relevant documents

Arabidopsis thaliana

Arabidopsis thaliana: entries and gene names

SIMILARITY comments

Index of protein domains and families

to top of pageNames·Attributes·General annotation·Ontologies·Sequence annotation·Sequences·References·Cross-refs·Entry info·Documents