PSBA_MASLA
ID PSBA_MASLA Reviewed; 358 AA.
AC Q9S3W5;
DT 05-FEB-2008, integrated into UniProtKB/Swiss-Prot.
DT 01-MAY-2000, sequence version 1.
DT 03-AUG-2022, entry version 92.
DE RecName: Full=Photosystem II protein D1 {ECO:0000255|HAMAP-Rule:MF_01379};
DE Short=PSII D1 protein {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 {ECO:0000255|HAMAP-Rule:MF_01379};
DE Flags: Precursor;
GN Name=psbA {ECO:0000255|HAMAP-Rule:MF_01379};
OS Mastigocladus laminosus (Fischerella sp.).
OC Bacteria; Cyanobacteria; Nostocales; Hapalosiphonaceae; Mastigocladus.
OX NCBI_TaxID=83541;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA He Z.Y., Nechushtai R.;
RT "Isolation of a gene encoding the D1 protein of photosystem II from the
RT thermophilic cyanobacterium Mastigocladus laminosus.";
RL Submitted (JUL-1999) to the EMBL/GenBank/DDBJ databases.
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-159 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 ---------------------------------------------------------------------------
CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC ---------------------------------------------------------------------------
DR EMBL; AF170924; AAD51002.1; -; Genomic_DNA.
DR AlphaFoldDB; Q9S3W5; -.
DR SMR; Q9S3W5; -.
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..342
FT /note="Photosystem II protein D1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT /id="PRO_0000316351"
FT PROPEP 343..358
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT /id="PRO_0000316352"
FT TRANSMEM 29..46
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT TRANSMEM 116..131
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT TRANSMEM 140..154
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT TRANSMEM 195..216
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT TRANSMEM 272..286
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 116
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 124
FT /ligand="pheophytin a"
FT /ligand_id="ChEBI:CHEBI:136840"
FT /ligand_label="D1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 168
FT /ligand="[CaMn4O5] cluster"
FT /ligand_id="ChEBI:CHEBI:189552"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 187
FT /ligand="[CaMn4O5] cluster"
FT /ligand_id="ChEBI:CHEBI:189552"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 196
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 213
FT /ligand="a quinone"
FT /ligand_id="ChEBI:CHEBI:132124"
FT /ligand_label="B"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 213
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 262..263
FT /ligand="a quinone"
FT /ligand_id="ChEBI:CHEBI:132124"
FT /ligand_label="B"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 270
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 330
FT /ligand="[CaMn4O5] cluster"
FT /ligand_id="ChEBI:CHEBI:189552"
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 340
FT /ligand="[CaMn4O5] cluster"
FT /ligand_id="ChEBI:CHEBI:189552"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT BINDING 342
FT /ligand="[CaMn4O5] cluster"
FT /ligand_id="ChEBI:CHEBI:189552"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT SITE 159
FT /note="Tyrosine radical intermediate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT SITE 188
FT /note="Stabilizes free radical intermediate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
FT SITE 342..343
FT /note="Cleavage; by CtpA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01379"
SQ SEQUENCE 358 AA; 39757 MW; 44962FC2535F437B CRC64;
MTTTLRRGET GSLWDRFCDW ITSTNNRIYV GWFGVLMIPT LLAATICFVI AFIAAPPVDI
DGIREPVSGS LLYGNNIITG AVVPTSNAIG LHFYPIWEAL DEWLYNGGPY ELIVFHFLIG
IFCWLGRQWE LSYRLGMRPW ICVAYSAPVA AATSVFLIYP IGQGSFSDGM PLGITGTFNF
MLVFQAEHNI LMHPFHQLGV AGVFGGSLFC AMHGSLVTSS LVRETTETES QNYGYKFGQE
QETYSIVAAH GYFGRLIWQY ASFNNSRSLH FFLAAWPVVC IWFTALGIST MAFNLNGFNF
NQSILDSQGR VVNTWADILN RANLGMEVMH ERNAHNFPLD LAAGEVLPIA LQSPAING
