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Q85FY6 (PSAB_CYAME) Reviewed, UniProtKB/Swiss-Prot

Last modified May 29, 2013. Version 65. Feed History...

Clusters with 100%, 90%, 50% identity | Documents (1) | 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
Encoded onPlastid; Chloroplast
OrganismCyanidioschyzon merolae (Red alga)
Taxonomic identifier45157 [NCBI]
Taxonomic lineageEukaryota › Rhodophyta › Bangiophyceae › Cyanidiales › Cyanidiaceae › Cyanidioschyzon

Protein attributes

Sequence length732 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/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. HAMAP-Rule MF_00482

Catalytic activity

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

Sequence similarities

Belongs to the PsaA/PsaB family.

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifier

Molecule processing

Chain1 – 732732Photosystem I P700 chlorophyll a apoprotein A2 HAMAP-Rule MF_00482
PRO_0000088612

Regions

Transmembrane46 – 6924Helical; Name=I; Potential
Transmembrane133 – 15624Helical; Name=II; Potential
Transmembrane173 – 19725Helical; Name=III; Potential
Transmembrane271 – 28919Helical; Name=IV; Potential
Transmembrane328 – 35124Helical; Name=V; Potential
Transmembrane367 – 39327Helical; Name=VI; Potential
Transmembrane415 – 43723Helical; Name=VII; Potential
Transmembrane515 – 53319Helical; Name=VIII; Potential
Transmembrane573 – 59422Helical; Name=IX; Potential
Transmembrane641 – 66323Helical; Name=X; Potential
Transmembrane705 – 72521Helical; Name=XI; Potential

Sites

Metal binding5571Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding5661Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding6521Magnesium (chlorophyll-a B1 axial ligand; P700 special pair) By similarity
Metal binding6601Magnesium (chlorophyll-a B3 axial ligand) By similarity
Binding site6681Chlorophyll-a B3 By similarity
Binding site6691Phylloquinone B By similarity

Sequences

Sequence LengthMass (Da)Tools
Q85FY6 [UniParc].

Last modified June 1, 2003. Version 1.
Checksum: 8C1958E12CBD4705

FASTA73282,027
        10         20         30         40         50         60 
MATKFPKFSQ ALASDPTTRR IWYGIATAHD FESHDGMTEE NLYQKIFASH FGHLAIIFLW 

        70         80         90        100        110        120 
TSGNLFHVAW QGNFEQWVAN PLKTKPLAHA IWDPHFGQAA LKAFTRGDTV ANISYSGVYH 

       130        140        150        160        170        180 
WWYTIGIRNN VELYTGALGL LVLSAVFLLA GWLHIQPKFK PSLSWFKNNE SRLNHHLAGL 

       190        200        210        220        230        240 
FGVSSLAWTG HLVHVAIPAS RGQHVGWDNF IMTPPHPAGL QPFFTGNWSV YAQSPDSMQH 

       250        260        270        280        290        300 
VFGTSQGAGT AILTFLGGFH PQTQSLWLTD MAHHHLAIAV IFIVAGHMYR TNFGIGHNLK 

       310        320        330        340        350        360 
TILEAHRPPS GRLGKGHIGI YQTLTNSLHF QLGLALASLS VVTSLVAQHM YAMPPYAYMA 

       370        380        390        400        410        420 
FDYVTQSALY THHQYIAGLL IVGAFAHGAI FFIRDYDPEQ NQDNVLARML AHKEAVISHL 

       430        440        450        460        470        480 
SWVSLFLGFH TLGLYVHNDV VVAFGNPEKQ ILIEPIFAQW IQATSGKMLY GFQVLLSSST 

       490        500        510        520        530        540 
SNASVAAQQL WLPGWLEAVN NESNSLFLTI GPGDFLVHHA IALGLHTTTL ILVKGALDAR 

       550        560        570        580        590        600 
GSKLMPDKKD FGYSFPCDGP GRGGTCDISA WDAFYLAMFW MLNTIGWVTF YWHWKHLSLW 

       610        620        630        640        650        660 
QGNVAQFNES STYLMGWLRD YLWLNSSPLI NGYNPYGMNS LAVWSWMFLF AHLVWATGFM 

       670        680        690        700        710        720 
FLISWRGYWQ ELIETLAWAH ERTPLANLIR WKDKPVALSI VQARLVGLVH FTVGYILTYA 

       730 
AFVIASTAGK FS

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References

[1]"Complete sequence and analysis of the plastid genome of the unicellular red alga Cyanidioschyzon merolae."
Ohta N., Matsuzaki M., Misumi O., Miyagishima S.-Y., Nozaki H., Tanaka K., Shin-i T., Kohara Y., Kuroiwa T.
DNA Res. 10:67-77(2003) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
Strain: 10D.

Cross-references

Sequence databases

EMBL
GenBank
DDBJ		AB002583 Genomic DNA. Translation: BAC76207.1.
RefSeqNP_849045.1. NC_004799.1.

3D structure databases

ProteinModelPortalQ85FY6.
SMRQ85FY6. Positions 2-731.
ModBaseSearch...

Protocols and materials databases

StructuralBiologyKnowledgebaseSearch...

Genome annotation databases

GeneID844936.

Phylogenomic databases

PhylomeDBQ85FY6.
ProtClustDBCHL00054.

Family and domain databases

Gene3D1.20.1130.10. 1 hit.
HAMAPMF_00482. PSI_PsaB.
InterProIPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
IPR006244. PSI_PsaB.
[Graphical view]
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_CYAME
AccessionPrimary (citable) accession number: Q85FY6
Entry history
Integrated into UniProtKB/Swiss-Prot: July 25, 2003
Last sequence update: June 1, 2003
Last modified: May 29, 2013
This is version 65 of the entry and version 1 of the sequence. [Complete history]
Entry statusReviewed (UniProtKB/Swiss-Prot)

Relevant documents

SIMILARITY comments

Index of protein domains and families

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