HAMAP

Accession	MF_01383
Dates	2-DEC-2008 (Created) 1-JUL-2011 (Last updated, Version 10)

Data class

Protein

Predictors

HAMAP; MF_01383; [distribution of match scores in UniProtKB];[seed alignment for MF_01383]

Names

PSII_PsbD_D2

Identifier

PSBD

Protein name

RecName: Full=Photosystem II D2 protein; Short=PSII D2 protein; EC=1.10.3.9; AltName: Full=Photosystem Q(A) protein;

Gene name

psbD

FUNCTION: One of the two reaction center proteins of photosystem II (PSII), D2 is needed for assembly of a stable PSII complex (By similarity).

CATALYTIC ACTIVITY: 2 H(2)O + 2 plastoquinone + 4 light = O(2) + 2 plastoquinol.

COFACTOR: The psbA/B heterodimer shares a non-heme iron and each subunit also binds two chlorophylls and pheophytin (By similarity).

SUBUNIT: The psbA/B heterodimer binds the P680 chlorophylls and subsequent electron acceptors. PSII consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. PSII forms dimeric complexes (By similarity).

SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane; Multi-pass membrane protein (By similarity).

SUBCELLULAR LOCATION: Cell inner membrane; Multi-pass membrane protein (By similarity).

SUBCELLULAR LOCATION: Cellular thylakoid membrane; Multi-pass membrane protein (By similarity).

MISCELLANEOUS: The peripheral chlorophyll-a D2 molecule has been identified as the spectroscopic species ChlzD2 (By similarity).

SIMILARITY: Belongs to the reaction center pufL/M/psbA/D family.

PROSITE	PS00244; REACTION_CENTER; 1;
Pfam	PF00124; Photo_RC; 1;
PRINTS	PR00256; REACTNCENTRE; 1;
TIGRFAMs	TIGR01152; psbD; 1;

Acetylation, Phosphoprotein.

Electron transport, Iron, Membrane, Metal-binding, Oxidoreductase, Photosynthesis, Photosystem II.

Cell membrane, Cell inner membrane.

Thylakoid.

Transmembrane, Transport, Transmembrane helix.

GO:0009055; Molecular function: electron carrier activity.
GO:0005506; Molecular function: iron ion binding.
GO:0015979; Biological process: photosynthesis.

GO:0009535; Cellular component: chloroplast thylakoid membrane.

GO:0005886; Cellular component: plasma membrane.

GO:0042651; Cellular component: thylakoid membrane.

From: PSBD_SPIOL (P06005)
Key		From		To		Description		Condition		FTGroup
TRANSMEM		36		56		Helical; (Potential)
TRANSMEM		109		129		Helical; (Potential)
TRANSMEM		142		164		Helical; (Potential)
TRANSMEM		192		218		Helical; (Potential)
TRANSMEM		266		286		Helical; (Potential)
METAL		118		118		Magnesium (chlorophyll-a D2, axial ligand; peripheral) (By similarity)		H
METAL		215		215		Iron; shared with heterodimeric partner (By similarity)		H
METAL		269		269		Iron; shared with heterodimeric partner (By similarity)		H
BINDING		215		215		Plastoquinone QA (By similarity)		H
BINDING		262		262		Plastoquinone QA; via amide nitrogen (By similarity)		F

Key		From		To		Description		Condition		FTGroup
MOD_RES		2		2		N-acetylthreonine (By similarity)		T
MOD_RES		2		2		Phosphothreonine (By similarity)		T

Size range:	351-358 amino acids
Related UniRules:	None
Template:	Q8CM25 (PSBD_THEEB); P06005 (PSBD_SPIOL): [Recover all]
Scope:	Bacteria; Cyanobacteria Plastid
Fusion:	Nter: None; Cter: None
Duplicate:	in ACAM1, NOSS1, ANAVT, CYAA5, NOSP7, SYNE7, THEEB, SYNP2, SYNP6, SYNP7, SYNS3, SYNS9, SYNSC, SYNJA, SYNJB, SYNR3, SYNPW, SYNPX
Plasmid encoded:	None
Comments:	D2 is phosphorylated in "higer" and "lower eukaryotes" (Ceratodon purpureus, Marchantia polymorpha, Adiantum tenerum) but not in red algae or cyanobacteria (Ceramium tenuicorne and Synechocystis, see PubMed:9512353).