PSBA2_SYNJA
ID PSBA2_SYNJA Reviewed; 352 AA.
AC Q2JTT0;
DT 05-FEB-2008, integrated into UniProtKB/Swiss-Prot.
DT 07-MAR-2006, sequence version 1.
DT 03-AUG-2022, entry version 103.
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};
GN OrderedLocusNames=CYA_1748;
OS Synechococcus sp. (strain JA-3-3Ab) (Cyanobacteria bacterium Yellowstone
OS A-Prime).
OC Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus;
OC unclassified Synechococcus.
OX NCBI_TaxID=321327;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=JA-3-3Ab;
RX PubMed=18059494; DOI=10.1038/ismej.2007.46;
RA Bhaya D., Grossman A.R., Steunou A.-S., Khuri N., Cohan F.M., Hamamura N.,
RA Melendrez M.C., Bateson M.M., Ward D.M., Heidelberg J.F.;
RT "Population level functional diversity in a microbial community revealed by
RT comparative genomic and metagenomic analyses.";
RL ISME J. 1:703-713(2007).
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-164 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}.
CC -!- CAUTION: This copy of psbA is missing some conserved residues important
CC for binding the Mn4-Ca-O5 cluster. {ECO:0000305}.
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DR EMBL; CP000239; ABC99903.1; -; Genomic_DNA.
DR RefSeq; WP_011430579.1; NC_007775.1.
DR AlphaFoldDB; Q2JTT0; -.
DR SMR; Q2JTT0; -.
DR STRING; 321327.CYA_1748; -.
DR EnsemblBacteria; ABC99903; ABC99903; CYA_1748.
DR KEGG; cya:CYA_1748; -.
DR eggNOG; ENOG502Z9WG; Bacteria.
DR HOGENOM; CLU_054206_1_0_3; -.
DR OMA; IGIWCYL; -.
DR OrthoDB; 586809at2; -.
DR Proteomes; UP000008818; 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 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 SUPFAM; SSF81483; SSF81483; 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..348
FT /note="Photosystem II protein D1 2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT /id="PRO_0000316406"
FT PROPEP 349..352
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT /id="PRO_0000316407"
FT TRANSMEM 32..49
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT TRANSMEM 121..136
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT TRANSMEM 145..159
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT TRANSMEM 200..221
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT TRANSMEM 278..292
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 121
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 129
FT /ligand="pheophytin a"
FT /ligand_id="ChEBI:CHEBI:136840"
FT /ligand_label="D1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 173
FT /ligand="[CaMn4O5] cluster"
FT /ligand_id="ChEBI:CHEBI:189552"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 192
FT /ligand="[CaMn4O5] cluster"
FT /ligand_id="ChEBI:CHEBI:189552"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 218
FT /ligand="a quinone"
FT /ligand_id="ChEBI:CHEBI:132124"
FT /ligand_label="B"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 218
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 276
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 336
FT /ligand="[CaMn4O5] cluster"
FT /ligand_id="ChEBI:CHEBI:189552"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 348
FT /ligand="[CaMn4O5] cluster"
FT /ligand_id="ChEBI:CHEBI:189552"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT SITE 164
FT /note="Tyrosine radical intermediate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT SITE 193
FT /note="Stabilizes free radical intermediate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT SITE 348..349
FT /note="Cleavage; by CtpA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
SQ SEQUENCE 352 AA; 38485 MW; CFFAE44EE5B39C66 CRC64;
MSVVVRRSAA ARRLWSWESF CQWITSTENR LYIGWFGVLM IPTLLAATFC FVIAFIAAPP
VDVDGIREPV IGSLLGGNNL ISAAVVPTSA AIALHFYPIW EAASLEEWLY NGGPYQLIVF
HFLIGVWCYL GRQWELSYRL GMRPWIAVAF SAPAAAATAV LLVYPIGQGS FSEGLPLGIA
GTFYFMLAFQ AEHNILMHPA SWLGVAGVFG GALLASLHGS LVISSLIRET SEEESQNAGY
RFGQQEVTYN FLAGHYAFLG RLGIPSLGWR NSRSVHFWMA ALPTLGIWAA AIGIGLMAFN
LNGFNFNQSI LDSQGRFIPT YADLLNRANL GIQAMHAPNA HHFPLLLAAK AD
