Skip Header

Contribute Send feedback
Read comments (?) or add your own

Q9MUJ6 (PSAA_EQUPA) Reviewed, UniProtKB/Swiss-Prot

Last modified April 3, 2013. Version 65. 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
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 I P700 chlorophyll a apoprotein A1
EC=1.97.1.12
Alternative name(s):
PSI-A
PsaA
Gene names
Name:psaA
Encoded onPlastid; Chloroplast
OrganismEquisetum palustre (Marsh horsetail)
Taxonomic identifier113538 [NCBI]
Taxonomic lineageEukaryota › Viridiplantae › Streptophyta › Embryophyta › Tracheophyta › Moniliformopses › Equisetopsida › Equisetales › Equisetaceae › Equisetum

Protein attributes

Sequence length719 AA.
Sequence statusFragment.
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-Rule MF_00458

Catalytic activity

Reduced plastocyanin + oxidized ferredoxin + light = oxidized plastocyanin + reduced ferredoxin. HAMAP-Rule MF_00458

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-Rule MF_00458.

Sequence similarities

Belongs to the PsaA/PsaB family.

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifier

Molecule processing

Chain‹1 – ›719›719Photosystem I P700 chlorophyll a apoprotein A1 HAMAP-Rule MF_00458
PRO_0000088548

Regions

Transmembrane60 – 8324Helical; Name=I; Potential
Transmembrane146 – 16924Helical; Name=II; Potential
Transmembrane185 – 20925Helical; Name=III; Potential
Transmembrane281 – 29919Helical; Name=IV; Potential
Transmembrane336 – 35924Helical; Name=V; Potential
Transmembrane375 – 40127Helical; Name=VI; Potential
Transmembrane423 – 44523Helical; Name=VII; Potential
Transmembrane521 – 53919Helical; Name=VIII; Potential
Transmembrane579 – 60022Helical; Name=IX; Potential
Transmembrane654 – 67623Helical; Name=X; Potential
Transmembrane714 – ›719›6Helical; Name=XI; Potential

Sites

Metal binding5631Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding5721Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding6651Magnesium (chlorophyll-a' A1 axial ligand; P700 special pair) By similarity
Metal binding6731Magnesium (chlorophyll-a A3 axial ligand) By similarity
Binding site6811Chlorophyll-a A3 By similarity
Binding site6821Phylloquinone A By similarity

Experimental info

Non-terminal residue11
Non-terminal residue7191

Sequences

Sequence LengthMass (Da)Tools
Q9MUJ6 [UniParc].

Last modified October 1, 2000. Version 1.
Checksum: A356DAADC0CF24D0

FASTA71979,913
        10         20         30         40         50         60 
KIIVEKDPVR TSFEKWAQPG HFSKTLAKGP NTTTWIWNLH ADAHDFDSHT NDLEDISRKI 

        70         80         90        100        110        120 
FSAHFGQLSI IFIWLSGMYF HGARFSNYEA WLSDPTHIKP SAQVVWPIVG QEILNGDVGG 

       130        140        150        160        170        180 
GFQGIQITSG FFQLWRASGI TNELQLYCTA IGALIFAGLM LFAGWFHYHK AAPKLAWFQD 

       190        200        210        220        230        240 
VESMLNHHLA GLLGLGSLGW AGHQVHVSLP INQLLDSGVD PREIPLPHEF ILNRDLLAQL 

       250        260        270        280        290        300 
YPSFSEGLTP FFNLEWSKYS DFLTFRGGLN PVTGGLWLTD TAHHHIAIAV LFLIAGHMYR 

       310        320        330        340        350        360 
TNWGIGHSIK EILEAHKGPF TGEGHRGLFE ILTSSWHAQL AVNLAMLGSL TIIVAHHMYA 

       370        380        390        400        410        420 
MPPYPYLATD YGTQLSLFTH HMWIGGFLVV GAAAHAAIFM VRDYDPSTQY NNLLDRVIRH 

       430        440        450        460        470        480 
RDAIISHLNW VCIFLGFHSF GLYIHNDTMS ALGRPQDMFS DTAIQLQPIF AQWIQNTHAL 

       490        500        510        520        530        540 
APSLTAPNAT ASTSLTWGGG DLVSVGGRVA LLPIPLGTAD FLVHHIHAFT IHVTVLILLK 

       550        560        570        580        590        600 
GVLFARSSRL IPDKANLGFR FPCDGPGRGG TCQVSAWDHV FLGLFWMYNS ISVVIFHFSW 

       610        620        630        640        650        660 
KMQSDVWGSI NEQGVISHIT GGNFAQSATT INGWLRDFLW AQASQVIQSY GSSLSAYGLL 

       670        680        690        700        710 
FLGAHFVWAF SLMFLFSGRG YWQELIESIL WAHNKLKVAP AIQPRALSIV QGRAVGVAH

« Hide

References

[1]"Error, bias, and long-branch attraction in data for two chloroplast photosystem genes in seed plants."
Sanderson M.J., Wojciechowski M.F., Hu J.-M., Sher Khan T., Brady S.G.
Mol. Biol. Evol. 17:782-797(2000) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA].

Cross-references

Sequence databases

EMBL
GenBank
DDBJ		AF180019 Genomic DNA. Translation: AAF29820.1.

3D structure databases

ProteinModelPortalQ9MUJ6.
SMRQ9MUJ6. Positions 13-719.
ModBaseSearch...

Protocols and materials databases

StructuralBiologyKnowledgebaseSearch...

Family and domain databases

Gene3D1.20.1130.10. 1 hit.
HAMAPMF_00458. PSI_PsaA.
InterProIPR006243. PSI_PsaA.
IPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
[Graphical view]
PfamPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFPIRSF002905. PSI_A. 1 hit.
PRINTSPR00257. PHOTSYSPSAAB.
TIGRFAMsTIGR01335. psaA. 1 hit.
PROSITEPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]
ProtoNetSearch...

Entry information

Entry namePSAA_EQUPA
AccessionPrimary (citable) accession number: Q9MUJ6
Entry history
Integrated into UniProtKB/Swiss-Prot: November 16, 2001
Last sequence update: October 1, 2000
Last modified: April 3, 2013
This is version 65 of the entry and version 1 of the sequence. [Complete history]
Entry statusReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program

Relevant documents

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