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A2BP21 (PSBA_PROMS) Reviewed, UniProtKB/Swiss-Prot

Last modified May 14, 2014. Version 58. Feed History...

Clusters with 100%, 90%, 50% identity | Documents (1) | Third-party data text xml rdf/xml gff fasta
to top of pageNames·Attributes·General annotation·Ontologies·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize order

Names and origin

Protein namesRecommended name:
Photosystem Q(B) protein

EC=1.10.3.9
Alternative name(s):
32 kDa thylakoid membrane protein
Photosystem II protein D1
Gene names
Name:psbA1
Ordered Locus Names:A9601_02441
AND
Name:psbA2
Ordered Locus Names:A9601_12521
OrganismProchlorococcus marinus (strain AS9601) [Complete proteome] [HAMAP]
Taxonomic identifier146891 [NCBI]
Taxonomic lineageBacteriaCyanobacteriaProchloralesProchlorococcaceaeProchlorococcus

Protein attributes

Sequence length360 AA.
Sequence statusComplete.
Sequence processingThe displayed sequence is further processed into a mature form.
Protein existenceInferred from homology

General annotation (Comments)

Function

This is one of the two reaction center proteins of photosystem II By similarity. HAMAP-Rule MF_01379

Catalytic activity

2 H2O + 2 plastoquinone + 4 light = O2 + 2 plastoquinol. HAMAP-Rule MF_01379

Cofactor

The PsbA/B heterodimer binds P680, the primary electron donor of PSII. It shares a non-heme iron and each subunit binds additional chlorophylls and pheophytin. PsbA provides most of the ligands for the Mn-cluster of the oxygen-evolving complex By similarity.

Subunit structure

The PsbA/B heterodimer binds the P680 chlorophylls and subsequent electron acceptors. PSII consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. PSII forms dimeric complexes By similarity.

Subcellular location

Cellular thylakoid membrane; Multi-pass membrane protein By similarity HAMAP-Rule MF_01379.

Miscellaneous

Herbicides such as atrazine, BNT, diuron or ioxynil bind to Q(B) and block electron transport By similarity.

Cyanobacteria usually contain more than 2 copies of the psbA gene.

Sequence similarities

Belongs to the reaction center PufL/M/PsbA/D family.

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifier

Molecule processing

Chain1 – 345345Photosystem Q(B) protein HAMAP-Rule MF_01379
PRO_0000316355
Propeptide346 – 36015 Potential
PRO_0000316356

Regions

Transmembrane37 – 5721Helical; Potential
Transmembrane110 – 13021Helical; Potential
Transmembrane142 – 16524Helical; Potential
Transmembrane193 – 21927Helical; Potential
Transmembrane270 – 29021Helical; Potential

Sites

Metal binding1711Calcium-manganese-oxide cluster [Ca-4Mn-5O]; calcium By similarity
Metal binding1711Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 1 By similarity
Metal binding1901Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2 By similarity
Metal binding2161Iron; shared with heterodimeric partner By similarity
Metal binding2731Iron; shared with heterodimeric partner By similarity
Metal binding3331Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2; via tele nitrogen By similarity
Metal binding3341Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 1 By similarity
Metal binding3341Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 3 By similarity
Metal binding3431Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2 By similarity
Metal binding3431Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 4 By similarity
Metal binding3451Calcium-manganese-oxide cluster [Ca-4Mn-5O]; calcium; via carboxylate By similarity
Metal binding3451Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 4; via carboxylate By similarity
Site345 – 3462Cleavage; by CtpA By similarity

Sequences

Sequence LengthMass (Da)Tools
A2BP21 [UniParc].

Last modified February 20, 2007. Version 1.
Checksum: E8389C98C87541E0

FASTA36039,638
        10         20         30         40         50         60 
MTTIQQQRSS LLKGWPQFCE WVTSTNNRIY VGWFGVLMIP CLLTAAACFI VAFIAAPPVD 

        70         80         90        100        110        120 
IDGIREPVAG SFLYGNNIIS GAVVPSSNAI GLHFYPIWEA ATVDEWLYNG GPYQLVIFHF 

       130        140        150        160        170        180 
LIGISAYMGR QWELSYRLGM RPWICVAYSA PVSAAFAVFL VYPFGQGSFS DGMPLGISGT 

       190        200        210        220        230        240 
FNFMFVFQAE HNILMHPFHM AGVAGMFGGS LFSAMHGSLV TSSLIRETTE TESQNYGYKF 

       250        260        270        280        290        300 
GQEEETYNIV AAHGYFGRLI FQYASFNNSR SLHFFLAVFP VVCVWLTSMG ICTMAFNLNG 

       310        320        330        340        350        360 
FNFNQSVVDA NGKIVPTWGD VLNRANLGME VMHERNAHNF PLDLAAAEST TVALSAPAIG 

« Hide

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: AS9601.

Cross-references

Sequence databases

EMBL
GenBank
DDBJ
CP000551 Genomic DNA. Translation: ABM69532.1.
CP000551 Genomic DNA. Translation: ABM70536.1.
RefSeqYP_001008639.1. NC_008816.1.
YP_001009643.1. NC_008816.1.

3D structure databases

ProteinModelPortalA2BP21.
SMRA2BP21. Positions 15-345.
ModBaseSearch...
MobiDBSearch...

Protein-protein interaction databases

STRING146891.A9601_12521.

Protocols and materials databases

StructuralBiologyKnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaABM69532; ABM69532; A9601_02441.
ABM70536; ABM70536; A9601_12521.
GeneID4716928.
4717969.
KEGGpmb:A9601_02441.
pmb:A9601_12521.
PATRIC22981935. VBIProMar75723_0244.

Organism-specific databases

CMRSearch...

Phylogenomic databases

eggNOGNOG04871.
HOGENOMHOG000246913.
KOK02703.
OMACFTIAFI.
OrthoDBEOG6Q2SGP.

Enzyme and pathway databases

BioCycPMAR146891:GH90-1276-MONOMER.
PMAR146891:GH90-247-MONOMER.

Family and domain databases

Gene3D1.20.85.10. 1 hit.
HAMAPMF_01379. PSII_PsbA_D1.
InterProIPR000484. Photo_RC_L/M.
IPR005867. PSII_D1.
[Graphical view]
PfamPF00124. Photo_RC. 1 hit.
[Graphical view]
PRINTSPR00256. REACTNCENTRE.
SUPFAMSSF81483. SSF81483. 1 hit.
TIGRFAMsTIGR01151. psbA. 1 hit.
PROSITEPS00244. REACTION_CENTER. 1 hit.
[Graphical view]
ProtoNetSearch...

Entry information

Entry namePSBA_PROMS
AccessionPrimary (citable) accession number: A2BP21
Entry history
Integrated into UniProtKB/Swiss-Prot: February 5, 2008
Last sequence update: February 20, 2007
Last modified: May 14, 2014
This is version 58 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