PSBD2_SYNP6
ID PSBD2_SYNP6 Reviewed; 352 AA.
AC Q5MZ82;
DT 20-JAN-2009, integrated into UniProtKB/Swiss-Prot.
DT 01-FEB-2005, sequence version 1.
DT 03-AUG-2022, entry version 105.
DE RecName: Full=Photosystem II D2 protein 2 {ECO:0000255|HAMAP-Rule:MF_01383};
DE Short=PSII D2 protein 2 {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 2 {ECO:0000255|HAMAP-Rule:MF_01383};
GN Name=psbD2 {ECO:0000255|HAMAP-Rule:MF_01383}; OrderedLocusNames=syc2448_d;
OS Synechococcus sp. (strain ATCC 27144 / PCC 6301 / SAUG 1402/1) (Anacystis
OS nidulans).
OC Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus.
OX NCBI_TaxID=269084;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 27144 / PCC 6301 / SAUG 1402/1;
RX PubMed=17211581; DOI=10.1007/s11120-006-9122-4;
RA Sugita C., Ogata K., Shikata M., Jikuya H., Takano J., Furumichi M.,
RA Kanehisa M., Omata T., Sugiura M., Sugita M.;
RT "Complete nucleotide sequence of the freshwater unicellular cyanobacterium
RT Synechococcus elongatus PCC 6301 chromosome: gene content and
RT organization.";
RL Photosyn. Res. 93:55-67(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. 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: 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_01383}.
CC -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC Rule:MF_01383}; Multi-pass membrane protein {ECO:0000255|HAMAP-
CC 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; AP008231; BAD80638.1; -; Genomic_DNA.
DR RefSeq; WP_011244758.1; NC_006576.1.
DR AlphaFoldDB; Q5MZ82; -.
DR SMR; Q5MZ82; -.
DR STRING; 269084.syc2448_d; -.
DR EnsemblBacteria; BAD80638; BAD80638; syc2448_d.
DR KEGG; syc:syc2448_d; -.
DR eggNOG; ENOG502Z8JK; Bacteria.
DR OMA; VNIFRAF; -.
DR Proteomes; UP000001175; 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:0010242; F:oxygen evolving activity; IEA:UniProtKB-EC.
DR GO; GO:0009772; P:photosynthetic electron transport in photosystem II; IEA:InterPro.
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; Chromophore; Electron transport; Iron; Magnesium; Membrane;
KW Metal-binding; Oxidoreductase; Photosynthesis; Photosystem II; Thylakoid;
KW Transmembrane; Transmembrane helix; Transport.
FT CHAIN 1..352
FT /note="Photosystem II D2 protein 2"
FT /id="PRO_0000359605"
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; 39462 MW; 67C94C2F53F392DC CRC64;
MTIAVGRAPA ERGWFDVLDD WLKRDRYVFV GWSGLLLFPC AYLALGGWLT GTSFVTSWYT
HGIASSYLEG GNFLTVAVST PADAFGHSLM LLWGPEAQGN FVRWCQLGGL WNFVALHGAF
GLIGFMLRQF EIARLVGVRP YNAIAFSGPI AVFVSVFLMY PLGQSSWFFA PSFGVAAIFR
FLLFLQGFHN WTLNPFHMMG VAGILGGALL CAIHGATVEN TLFEDSEQSN TFRAFEPTQA
EETYSMVTAN RFWSQIFGIA FSNKRWLHFF MLFVPVTGLW MSSIGIVGLA LNLRAYDFVS
QELRAAEDPE FETFYTKNIL LNEGIRAWMA PQDQPHEKFV FPEEVLPRGN AL
