Legends: 1, Iron-sulfur (4Fe-4S); shared with dimeric partner. {ECO:0000255|HAMAP- Rule:MF_00458}; 2, Magnesium (divinyl chlorophyll-a' A1 axial ligand; P700 special pair). {ECO:0000255|HAMAP-Rule:MF_00458}; 3, Magnesium (divinyl chlorophyll-a A3 axial ligand). {ECO:0000255|HAMAP- Rule:MF_00458}; 4, BINDING Divinyl chlorophyll-a A3. {ECO:0000255|HAMAP-Rule:MF_00458}; 5, BINDING Phylloquinone A. {ECO:0000255|HAMAP- Rule:MF_00458}; 6, TRANSMEM Helical; Name=I. {ECO:0000255|HAMAP- Rule:MF_00458}; 7, TRANSMEM Helical; Name=II. {ECO:0000255|HAMAP- Rule:MF_00458}; 8, TRANSMEM Helical; Name=III. {ECO:0000255|HAMAP- Rule:MF_00458}; 9, TRANSMEM Helical; Name=IV. {ECO:0000255|HAMAP- Rule:MF_00458}; 10, TRANSMEM Helical; Name=V. {ECO:0000255|HAMAP- Rule:MF_00458}; 11, TRANSMEM Helical; Name=VI. {ECO:0000255|HAMAP- Rule:MF_00458}; 12, TRANSMEM Helical; Name=VII. {ECO:0000255|HAMAP- Rule:MF_00458}; 13, TRANSMEM Helical; Name=VIII. {ECO:0000255|HAMAP- Rule:MF_00458}; 14, TRANSMEM Helical; Name=IX. {ECO:0000255|HAMAP- Rule:MF_00458}; 15, TRANSMEM Helical; Name=X. {ECO:0000255|HAMAP- Rule:MF_00458}; 16, TRANSMEM Helical; Name=XI. {ECO:0000255|HAMAP- Rule:MF_00458}; 17, ipat:PHOTOSYSTEM_I_PSAAB [T].
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ID PSAA_PROMM Reviewed; 776 AA.
AC Q7V510;
DT 21-JUN-2005, integrated into UniProtKB/Swiss-Prot.
DT 01-OCT-2003, sequence version 1.
DT 18-JAN-2017, entry version 93.
DE RecName: Full=Photosystem I P700 chlorophyll a apoprotein A1 {ECO:0000255|HAMAP-Rule:MF_00458};
DE EC=1.97.1.12 {ECO:0000255|HAMAP-Rule:MF_00458};
DE AltName: Full=PsaA {ECO:0000255|HAMAP-Rule:MF_00458};
GN Name=psaA {ECO:0000255|HAMAP-Rule:MF_00458};
GN OrderedLocusNames=PMT_1770;
OS Prochlorococcus marinus (strain MIT 9313).
OC Bacteria; Cyanobacteria; Synechococcales; Prochloraceae;
OC Prochlorococcus.
OX NCBI_TaxID=74547;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=MIT 9313;
RX PubMed=12917642; DOI=10.1038/nature01947;
RA Rocap G., Larimer F.W., Lamerdin J.E., Malfatti S., Chain P.,
RA Ahlgren N.A., Arellano A., Coleman M., Hauser L., Hess W.R.,
RA Johnson Z.I., Land M.L., Lindell D., Post A.F., Regala W., Shah M.,
RA Shaw S.L., Steglich C., Sullivan M.B., Ting C.S., Tolonen A.,
RA Webb E.A., Zinser E.R., Chisholm S.W.;
RT "Genome divergence in two Prochlorococcus ecotypes reflects oceanic
RT niche differentiation.";
RL Nature 424:1042-1047(2003).
RN [2]
RP REPRESSION UNDER IRON-STARVATION.
RX PubMed=12944966; DOI=10.1038/nature01933;
RA Bibby T.S., Mary I., Nield J., Partensky F., Barber J.;
RT "Low-light-adapted Prochlorococcus species possess specific antennae
RT for each photosystem.";
RL Nature 424:1051-1054(2003).
CC -!- FUNCTION: PsaA and PsaB bind P700, the primary electron donor of
CC photosystem I (PSI), as well as the electron acceptors A0, A1 and
CC FX. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase,
CC converting photonic excitation into a charge separation, which
CC transfers an electron from the donor P700 chlorophyll pair to the
CC spectroscopically characterized acceptors A0, A1, FX, FA and FB in
CC turn. Oxidized P700 is reduced on the lumenal side of the
CC thylakoid membrane by plastocyanin or cytochrome c6.
CC {ECO:0000255|HAMAP-Rule:MF_00458}.
CC -!- CATALYTIC ACTIVITY: Reduced plastocyanin + oxidized ferredoxin +
CC light = oxidized plastocyanin + reduced ferredoxin.
CC {ECO:0000255|HAMAP-Rule:MF_00458}.
CC -!- COFACTOR:
CC Note=PSI electron transfer chain: 5 divinyl chlorophyll a, 1
CC divinyl chlorophyll a', 2 phylloquinones and 3 4Fe-4S clusters.
CC PSI core antenna: 90 divinyl chlorophyll a, 22 carotenoids, 3
CC phospholipids and 1 galactolipid. P700 is a divinyl chlorophyll
CC a/divinyl chlorophyll a' dimer, A0 is one or more chlorophyll
CC divinyl a, A1 is one or both phylloquinones and FX is a shared
CC 4Fe-4S iron-sulfur center. {ECO:0000250};
CC -!- SUBUNIT: The PsaA/B heterodimer binds the P700 chlorophyll special
CC pair and subsequent electron acceptors. PSI consists of a core
CC antenna complex that captures photons, and an electron transfer
CC chain that converts photonic excitation into a charge separation.
CC The cyanobacterial PSI reaction center is composed of one copy
CC each of PsaA,B,C,D,E,F,I,J,K,L,M and X, and forms trimeric
CC complexes. {ECO:0000255|HAMAP-Rule:MF_00458}.
CC -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane
CC {ECO:0000255|HAMAP-Rule:MF_00458}; Multi-pass membrane protein
CC {ECO:0000255|HAMAP-Rule:MF_00458}.
CC -!- INDUCTION: Transcription decreases upon iron starvation.
CC {ECO:0000269|PubMed:12944966}.
CC -!- SIMILARITY: Belongs to the PsaA/PsaB family. {ECO:0000255|HAMAP-
CC Rule:MF_00458}.
DR EMBL; BX548175; CAE21945.1; -; Genomic_DNA.
DR RefSeq; WP_011131137.1; NC_005071.1.
DR ProteinModelPortal; Q7V510; -.
DR STRING; 74547.PMT1770; -.
DR EnsemblBacteria; CAE21945; CAE21945; PMT_1770.
DR GeneID; 29494483; -.
DR KEGG; pmt:PMT_1770; -.
DR PATRIC; 23012301; VBIProMar135351_2281.
DR eggNOG; ENOG4105MN0; Bacteria.
DR eggNOG; ENOG410XT0I; LUCA.
DR KO; K02689; -.
DR OMA; MFLGAHF; -.
DR OrthoDB; POG091H09L9; -.
DR Proteomes; UP000001423; Chromosome.
DR GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR GO; GO:0009522; C:photosystem I; IEA:UniProtKB-KW.
DR GO; GO:0042651; C:thylakoid membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:UniProtKB-KW.
DR GO; GO:0016168; F:chlorophyll binding; IEA:UniProtKB-KW.
DR GO; GO:0009055; F:electron carrier activity; IEA:UniProtKB-HAMAP.
DR GO; GO:0000287; F:magnesium ion binding; IEA:UniProtKB-HAMAP.
DR GO; GO:0016491; F:oxidoreductase activity; IEA:UniProtKB-KW.
DR GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-HAMAP.
DR GO; GO:0018298; P:protein-chromophore linkage; IEA:UniProtKB-KW.
DR Gene3D; 1.20.1130.10; -; 1.
DR HAMAP; MF_00458; PSI_PsaA; 1.
DR InterPro; IPR006243; PSI_PsaA.
DR InterPro; IPR001280; PSI_PsaA/B.
DR InterPro; IPR020586; PSI_PsaA/B_CS.
DR Pfam; PF00223; PsaA_PsaB; 1.
DR PIRSF; PIRSF002905; PSI_A; 1.
DR PRINTS; PR00257; PHOTSYSPSAAB.
DR SUPFAM; SSF81558; SSF81558; 1.
DR TIGRFAMs; TIGR01335; psaA; 1.
DR PROSITE; PS00419; PHOTOSYSTEM_I_PSAAB; 1.
PE 2: Evidence at transcript level;
KW 4Fe-4S; Chlorophyll; Chromophore; Complete proteome;
KW Electron transport; Iron; Iron-sulfur; Magnesium; Membrane;
KW Metal-binding; Oxidoreductase; Photosynthesis; Photosystem I;
KW Reference proteome; Thylakoid; Transmembrane; Transmembrane helix;
KW Transport.
FT CHAIN 1 776 Photosystem I P700 chlorophyll a
FT apoprotein A1.
FT /FTId=PRO_0000088589.
FT TRANSMEM 76 99 Helical; Name=I. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT TRANSMEM 162 185 Helical; Name=II. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT TRANSMEM 201 225 Helical; Name=III. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT TRANSMEM 309 327 Helical; Name=IV. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT TRANSMEM 368 391 Helical; Name=V. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT TRANSMEM 407 433 Helical; Name=VI. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT TRANSMEM 455 477 Helical; Name=VII. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT TRANSMEM 557 575 Helical; Name=VIII. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT TRANSMEM 615 636 Helical; Name=IX. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT TRANSMEM 690 712 Helical; Name=X. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT TRANSMEM 750 770 Helical; Name=XI. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT METAL 599 599 Iron-sulfur (4Fe-4S); shared with dimeric
FT partner. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT METAL 608 608 Iron-sulfur (4Fe-4S); shared with dimeric
FT partner. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT METAL 701 701 Magnesium (divinyl chlorophyll-a' A1
FT axial ligand; P700 special pair).
FT {ECO:0000255|HAMAP-Rule:MF_00458}.
FT METAL 709 709 Magnesium (divinyl chlorophyll-a A3 axial
FT ligand). {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
FT BINDING 717 717 Divinyl chlorophyll-a A3.
FT {ECO:0000255|HAMAP-Rule:MF_00458}.
FT BINDING 718 718 Phylloquinone A. {ECO:0000255|HAMAP-
FT Rule:MF_00458}.
CC --------------------------------------------------------------------------
CC The following FT lines are automated annotations from the MyHits database.
CC --------------------------------------------------------------------------
FT MYHIT 38 770 ipfam:PsaA_PsaB [T]
FT MYHIT 599 608 ipat:PHOTOSYSTEM_I_PSAAB [T]
FT MYHIT 1 776 ihamap:PSI_PsaA [T]
SQ SEQUENCE 776 AA; 84981 MW; 31B48510039617D5 CRC64;
MTISPPERGE KAKPIYDQPV DRDHVPADFE KFEQPGFFSK SLAKGPNSTT WIWNLHADAH
DFDTHIGDLE ETSRKIFSAH FGHLAIVFIW MSGAFFHGAR FSNYSGWLAD PTHVKASAQV
VWPIVGQEIM NADMGAGFNG IQITSGIFQM WRAWGITSET ELMALATGAL IMAALVLHGG
IFHYHKAAPK LEWFKKIESM LQHHQIGLFG LGSLGWTGHL IHVANPTNAL LDAIDAGTPM
VLDGKTIATA ADIPLPHELY NADLVGQIYP GLASGVGNFF SANWWAFSDF LTNNGGVNPV
TGALWSTDVA HHHLAWAVFL MFGGHVYRSR FGIGHSMKEI MGNVKGDPLL FPAPNGHKGL
FEFLSNSWHA QLAVNLACIG SGSIVVAHHM YSLPPYPYLA TDYPTVLGLF THHMWIGGLM
ICGAAAHAGI AVIRDYDVSV HVDNVLDRMF KARDAIISHL NWVCMFLGFH SFGLYIHNDS
MRALGRSQDM FSDSAIQLQP VLAQWIQSLW ASSIGTSAVV GTTTGLPGAV SDVFNGSVVA
VGGKVALMAI PLGTADLMIH HIHAFTIHVT CLILLKGVLF ARSSRLVPDK ANLGFRFSCD
GPGRGGTCQV SSWDHVFLGL FWMYNSLSMV IFYFSWKMQS DVWGTVNSDG SVTHLVSGNF
AQSAITVNGW FRDFLWAQSS QVLTSYGTGL SGYGLLFLGG HFVWAFSLMF LFSGRGYWQE
LFESIIWAHN KLKLAPTIQP RALSITQGRA VGVTHFLFGG IVTTWAFFHA RLLGLG
//
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