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PSBA2_PARMW
ID   PSBA2_PARMW             Reviewed;         358 AA.
AC   Q7U669;
DT   05-FEB-2008, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2003, sequence version 1.
DT   03-AUG-2022, entry version 117.
DE   RecName: Full=Photosystem II protein D1 2 {ECO:0000255|HAMAP-Rule:MF_01379};
DE            Short=PSII D1 protein 2 {ECO:0000255|HAMAP-Rule:MF_01379};
DE            EC=1.10.3.9 {ECO:0000255|HAMAP-Rule:MF_01379};
DE   AltName: Full=Photosystem II Q(B) protein 2 {ECO:0000255|HAMAP-Rule:MF_01379};
DE   Flags: Precursor;
GN   Name=psbA2 {ECO:0000255|HAMAP-Rule:MF_01379, ECO:0000305}; Synonyms=psbA1;
GN   OrderedLocusNames=SYNW1470;
OS   Parasynechococcus marenigrum (strain WH8102).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Parasynechococcus; Parasynechococcus marenigrum.
OX   NCBI_TaxID=84588;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=WH8102;
RX   PubMed=12917641; DOI=10.1038/nature01943;
RA   Palenik B., Brahamsha B., Larimer F.W., Land M.L., Hauser L., Chain P.,
RA   Lamerdin J.E., Regala W., Allen E.E., McCarren J., Paulsen I.T.,
RA   Dufresne A., Partensky F., Webb E.A., Waterbury J.;
RT   "The genome of a motile marine Synechococcus.";
RL   Nature 424:1037-1042(2003).
CC   -!- FUNCTION: Photosystem II (PSII) is a light-driven water:plastoquinone
CC       oxidoreductase that uses light energy to abstract electrons from H(2)O,
CC       generating O(2) and a proton gradient subsequently used for ATP
CC       formation. It consists of a core antenna complex that captures photons,
CC       and an electron transfer chain that converts photonic excitation into a
CC       charge separation. The D1/D2 (PsbA/PsbA) reaction center heterodimer
CC       binds P680, the primary electron donor of PSII as well as several
CC       subsequent electron acceptors. {ECO:0000255|HAMAP-Rule:MF_01379}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=2 a plastoquinone + 2 H2O + 4 hnu = 2 a plastoquinol + O2;
CC         Xref=Rhea:RHEA:36359, Rhea:RHEA-COMP:9561, Rhea:RHEA-COMP:9562,
CC         ChEBI:CHEBI:15377, ChEBI:CHEBI:15379, ChEBI:CHEBI:17757,
CC         ChEBI:CHEBI:30212, ChEBI:CHEBI:62192; EC=1.10.3.9;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01379};
CC   -!- COFACTOR:
CC       Note=The D1/D2 heterodimer binds P680, chlorophylls that are the
CC       primary electron donor of PSII, and subsequent electron acceptors. It
CC       shares a non-heme iron and each subunit binds pheophytin, quinone,
CC       additional chlorophylls, carotenoids and lipids. D1 provides most of
CC       the ligands for the Mn4-Ca-O5 cluster of the oxygen-evolving complex
CC       (OEC). There is also a Cl(-1) ion associated with D1 and D2, which is
CC       required for oxygen evolution. The PSII complex binds additional
CC       chlorophylls, carotenoids and specific lipids. {ECO:0000255|HAMAP-
CC       Rule:MF_01379};
CC   -!- SUBUNIT: Cyanobacterial PSII is composed of 1 copy each of membrane
CC       proteins PsbA, PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK,
CC       PsbL, PsbM, PsbT, PsbX, PsbY, PsbZ, Ycf12, at least 3 peripheral
CC       proteins PsbO, PsbU, PsbV and a large number of cofactors. It forms
CC       dimeric complexes. {ECO:0000255|HAMAP-Rule:MF_01379}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_01379}; Multi-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_01379}.
CC   -!- PTM: Tyr-160 forms a radical intermediate that is referred to as redox-
CC       active TyrZ, YZ or Y-Z. {ECO:0000255|HAMAP-Rule:MF_01379}.
CC   -!- PTM: C-terminally processed by CtpA; processing is essential to allow
CC       assembly of the oxygen-evolving complex and thus photosynthetic growth.
CC       {ECO:0000255|HAMAP-Rule:MF_01379}.
CC   -!- MISCELLANEOUS: Cyanobacteria usually contain more than 2 copies of the
CC       psbA gene. {ECO:0000255|HAMAP-Rule:MF_01379}.
CC   -!- MISCELLANEOUS: 2 of the reaction center chlorophylls (ChlD1 and ChlD2)
CC       are entirely coordinated by water. {ECO:0000255|HAMAP-Rule:MF_01379}.
CC   -!- MISCELLANEOUS: Herbicides such as atrazine, BNT, diuron or ioxynil bind
CC       in the Q(B) binding site and block subsequent electron transfer.
CC       {ECO:0000255|HAMAP-Rule:MF_01379}.
CC   -!- SIMILARITY: Belongs to the reaction center PufL/M/PsbA/D family.
CC       {ECO:0000255|HAMAP-Rule:MF_01379}.
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DR   EMBL; BX569693; CAE07985.1; -; Genomic_DNA.
DR   RefSeq; WP_011128334.1; NC_005070.1.
DR   AlphaFoldDB; Q7U669; -.
DR   SMR; Q7U669; -.
DR   STRING; 84588.SYNW1470; -.
DR   EnsemblBacteria; CAE07985; CAE07985; SYNW1470.
DR   KEGG; syw:SYNW1470; -.
DR   eggNOG; ENOG502Z87P; Bacteria.
DR   HOGENOM; CLU_054206_1_0_3; -.
DR   OMA; CQWVTDT; -.
DR   OrthoDB; 382342at2; -.
DR   BioCyc; MetaCyc:TX72_RS07385-MON; -.
DR   Proteomes; UP000001422; Chromosome.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0009523; C:photosystem II; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0016168; F:chlorophyll binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0045156; F:electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity; IEA:InterPro.
DR   GO; GO:0005506; F:iron ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0016682; F:oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor; IEA:UniProtKB-UniRule.
DR   GO; GO:0010242; F:oxygen evolving activity; IEA:UniProtKB-EC.
DR   GO; GO:0009772; P:photosynthetic electron transport in photosystem II; IEA:InterPro.
DR   GO; GO:0009635; P:response to herbicide; IEA:UniProtKB-KW.
DR   CDD; cd09289; Photosystem-II_D1; 1.
DR   Gene3D; 1.20.85.10; -; 1.
DR   HAMAP; MF_01379; PSII_PsbA_D1; 1.
DR   InterPro; IPR036854; Photo_II_D1/D2_sf.
DR   InterPro; IPR000484; Photo_RC_L/M.
DR   InterPro; IPR005867; PSII_D1.
DR   PANTHER; PTHR33149; PTHR33149; 1.
DR   Pfam; PF00124; Photo_RC; 1.
DR   PRINTS; PR00256; REACTNCENTRE.
DR   SUPFAM; SSF81483; SSF81483; 1.
DR   TIGRFAMs; TIGR01151; psbA; 1.
DR   PROSITE; PS00244; REACTION_CENTER; 1.
PE   3: Inferred from homology;
KW   Calcium; Chlorophyll; Chromophore; Electron transport;
KW   Herbicide resistance; Iron; Magnesium; Manganese; Membrane; Metal-binding;
KW   Oxidoreductase; Photosynthesis; Photosystem II; Thylakoid; Transmembrane;
KW   Transmembrane helix; Transport.
FT   CHAIN           1..343
FT                   /note="Photosystem II protein D1 2"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT                   /id="PRO_0000316422"
FT   PROPEP          344..358
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT                   /id="PRO_0000316423"
FT   TRANSMEM        28..45
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   TRANSMEM        117..132
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   TRANSMEM        141..155
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   TRANSMEM        196..217
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   TRANSMEM        273..287
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         117
FT                   /ligand="chlorophyll a"
FT                   /ligand_id="ChEBI:CHEBI:58416"
FT                   /ligand_label="ChlzD1"
FT                   /ligand_part="Mg"
FT                   /ligand_part_id="ChEBI:CHEBI:25107"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         125
FT                   /ligand="pheophytin a"
FT                   /ligand_id="ChEBI:CHEBI:136840"
FT                   /ligand_label="D1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         169
FT                   /ligand="[CaMn4O5] cluster"
FT                   /ligand_id="ChEBI:CHEBI:189552"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         188
FT                   /ligand="[CaMn4O5] cluster"
FT                   /ligand_id="ChEBI:CHEBI:189552"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         197
FT                   /ligand="chlorophyll a"
FT                   /ligand_id="ChEBI:CHEBI:58416"
FT                   /ligand_label="PD1"
FT                   /ligand_part="Mg"
FT                   /ligand_part_id="ChEBI:CHEBI:25107"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         214
FT                   /ligand="a quinone"
FT                   /ligand_id="ChEBI:CHEBI:132124"
FT                   /ligand_label="B"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         214
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /ligand_note="ligand shared with heterodimeric partner"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         263..264
FT                   /ligand="a quinone"
FT                   /ligand_id="ChEBI:CHEBI:132124"
FT                   /ligand_label="B"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         271
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /ligand_note="ligand shared with heterodimeric partner"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         331
FT                   /ligand="[CaMn4O5] cluster"
FT                   /ligand_id="ChEBI:CHEBI:189552"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         332
FT                   /ligand="[CaMn4O5] cluster"
FT                   /ligand_id="ChEBI:CHEBI:189552"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         341
FT                   /ligand="[CaMn4O5] cluster"
FT                   /ligand_id="ChEBI:CHEBI:189552"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   BINDING         343
FT                   /ligand="[CaMn4O5] cluster"
FT                   /ligand_id="ChEBI:CHEBI:189552"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   SITE            160
FT                   /note="Tyrosine radical intermediate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   SITE            189
FT                   /note="Stabilizes free radical intermediate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT   SITE            343..344
FT                   /note="Cleavage; by CtpA"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
SQ   SEQUENCE   358 AA;  39414 MW;  88D88E4F46900C7D CRC64;
     MSTAIRSGRQ SNWEAFCQWV TDTNNRIYVG WFGVLMIPCL LAATICFTIA FIAAPPVDID
     GIREPVAGSL IYGNNIISGA VVPSSNAIGL HFYPIWEAAS LDEWLYNGGP YQLVCFHFLI
     GISAYMGRQW ELSYRLGMRP WICVAYSAPL SAAMAVFLVY PFGQGSFSDG MPLGISGTFN
     FMLVFQAEHN ILMHPFHMLG VAGVFGGSLF SAMHGSLVTS SLVRETTETE SQNYGYKFGQ
     EEETYNIVAA HGYFGRLIFQ YASFNNSRSL HFFLGAWPVV GIWFTSMGVS TMAFNLNGFN
     FNQSILDGQG RVVNTWADMV NRAGLGMEVM HERNAHNFPL DLATVESTPV ALQAPAIG
 
 
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