PSBD_EUGGR
ID PSBD_EUGGR Reviewed; 352 AA.
AC P31557;
DT 01-JUL-1993, integrated into UniProtKB/Swiss-Prot.
DT 01-JUL-1993, sequence version 1.
DT 03-AUG-2022, entry version 114.
DE RecName: Full=Photosystem II D2 protein {ECO:0000255|HAMAP-Rule:MF_01383};
DE Short=PSII D2 protein {ECO:0000255|HAMAP-Rule:MF_01383};
DE EC=1.10.3.9 {ECO:0000255|HAMAP-Rule:MF_01383};
DE AltName: Full=Photosystem Q(A) protein {ECO:0000255|HAMAP-Rule:MF_01383};
GN Name=psbD {ECO:0000255|HAMAP-Rule:MF_01383};
OS Euglena gracilis.
OG Plastid; Chloroplast.
OC Eukaryota; Discoba; Euglenozoa; Euglenida; Spirocuta; Euglenophyceae;
OC Euglenales; Euglenaceae; Euglena.
OX NCBI_TaxID=3039;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Z / UTEX 753;
RX PubMed=8346031; DOI=10.1093/nar/21.15.3537;
RA Hallick R.B., Hong L., Drager R.G., Favreau M.R., Monfort A., Orsat B.,
RA Spielmann A., Stutz E.;
RT "Complete sequence of Euglena gracilis chloroplast DNA.";
RL Nucleic Acids Res. 21:3537-3544(1993).
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. D2 is needed for assembly of a stable
CC PSII complex. {ECO:0000255|HAMAP-Rule:MF_01383}.
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_01383};
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. There is also a Cl(-1)
CC ion associated with D1 and D2, which is required for oxygen evolution.
CC The PSII complex binds additional chlorophylls, carotenoids and
CC specific lipids. {ECO:0000255|HAMAP-Rule:MF_01383};
CC -!- SUBUNIT: PSII is composed of 1 copy each of membrane proteins PsbA,
CC PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT,
CC PsbX, PsbY, PsbZ, Ycf12, at least 3 peripheral proteins of the oxygen-
CC evolving complex and a large number of cofactors. It forms dimeric
CC complexes. {ECO:0000255|HAMAP-Rule:MF_01383}.
CC -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane
CC {ECO:0000255|HAMAP-Rule:MF_01383}; Multi-pass membrane protein
CC {ECO:0000255|HAMAP-Rule:MF_01383}.
CC -!- MISCELLANEOUS: 2 of the reaction center chlorophylls (ChlD1 and ChlD2)
CC are entirely coordinated by water. {ECO:0000255|HAMAP-Rule:MF_01383}.
CC -!- SIMILARITY: Belongs to the reaction center PufL/M/PsbA/D family.
CC {ECO:0000255|HAMAP-Rule:MF_01383}.
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DR EMBL; Z11874; -; NOT_ANNOTATED_CDS; Genomic_DNA.
DR EMBL; X70810; CAA50076.1; -; Genomic_DNA.
DR PIR; S34495; S34495.
DR RefSeq; NP_041889.2; NC_001603.2.
DR AlphaFoldDB; P31557; -.
DR SMR; P31557; -.
DR PRIDE; P31557; -.
DR GeneID; 807490; -.
DR GO; GO:0009535; C:chloroplast thylakoid membrane; IEA:UniProtKB-SubCell.
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: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:0010242; F:oxygen evolving activity; IEA:UniProtKB-EC.
DR GO; GO:0009772; P:photosynthetic electron transport in photosystem II; IEA:InterPro.
DR CDD; cd09288; Photosystem-II_D2; 1.
DR Gene3D; 1.20.85.10; -; 1.
DR HAMAP; MF_01383; PSII_PsbD_D2; 1.
DR InterPro; IPR036854; Photo_II_D1/D2_sf.
DR InterPro; IPR000484; Photo_RC_L/M.
DR InterPro; IPR005868; PSII_PsbD/D2.
DR PANTHER; PTHR33149; PTHR33149; 1.
DR Pfam; PF00124; Photo_RC; 1.
DR PRINTS; PR00256; REACTNCENTRE.
DR SUPFAM; SSF81483; SSF81483; 1.
DR TIGRFAMs; TIGR01152; psbD; 1.
DR PROSITE; PS00244; REACTION_CENTER; 1.
PE 3: Inferred from homology;
KW Chlorophyll; Chloroplast; Chromophore; Electron transport; Iron; Magnesium;
KW Membrane; Metal-binding; Oxidoreductase; Photosynthesis; Photosystem II;
KW Plastid; Thylakoid; Transmembrane; Transmembrane helix; Transport.
FT CHAIN 1..352
FT /note="Photosystem II D2 protein"
FT /id="PRO_0000090503"
FT TRANSMEM 40..60
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01383"
FT TRANSMEM 124..140
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01383"
FT TRANSMEM 152..165
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01383"
FT TRANSMEM 207..227
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01383"
FT TRANSMEM 278..294
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01383"
FT BINDING 117
FT /ligand="chlorophyll a"
FT /ligand_id="ChEBI:CHEBI:58416"
FT /ligand_label="ChlzD2"
FT /ligand_part="Mg"
FT /ligand_part_id="ChEBI:CHEBI:25107"
FT /note="axial binding residue"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01383"
FT BINDING 129
FT /ligand="pheophytin a"
FT /ligand_id="ChEBI:CHEBI:136840"
FT /ligand_label="D2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01383"
FT BINDING 142
FT /ligand="pheophytin a"
FT /ligand_id="ChEBI:CHEBI:136840"
FT /ligand_label="D2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01383"
FT BINDING 197
FT /ligand="chlorophyll a"
FT /ligand_id="ChEBI:CHEBI:58416"
FT /ligand_label="PD2"
FT /ligand_part="Mg"
FT /ligand_part_id="ChEBI:CHEBI:25107"
FT /note="axial binding residue"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01383"
FT BINDING 214
FT /ligand="a plastoquinone"
FT /ligand_id="ChEBI:CHEBI:17757"
FT /ligand_label="Q(A)"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01383"
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_01383"
FT BINDING 261
FT /ligand="a plastoquinone"
FT /ligand_id="ChEBI:CHEBI:17757"
FT /ligand_label="Q(A)"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01383"
FT BINDING 268
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_01383"
SQ SEQUENCE 352 AA; 39474 MW; 16A9407D49AA2C27 CRC64;
MTFTDLNTEN KNGWFDVADD WLKKDRFIFI GWSGLLLFPC SYLALGGWLT GITFVTSWYT
HGLASSFLEG CNALTAAVST PPNSMGHSLL LLLGSEAQWD FTRWLQIGGL WPFIALHGAF
GLIGFMLRQF EIAKAVQIRP YNAIAFSAPI SVFVSVFLIY PLGQSGWFFA PSFGVAAIFR
FILFFQGFHN WTLNPFHMMG VAGVLGAALL CAIHGATVEN TIFEDGDSPN TFRAFNPLQS
EETYSMVTAN RFWSQIFGVA FSNKRWLHFF MVFVPVTGLR MSALGIVGLA LNLRAYDFVS
QEIRAAEDPE FETFYTKNIL LNEGIRAWMA AQDQPHEQFI FPEEVLPRGN AL
