2XB3

The Structure of Cyanobacterial PsbP

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	PsbP-like	8078150	4002692	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Mog1p/PsbP-like	8078151	3000396	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PsbP	e2xb3A1	A: a+b three layers	X: Mog1p/PsbP-like	H: Mog1p/PsbP-like (From Topology)	T: Mog1p/PsbP-like	F: PsbP	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.1000.10	Alpha Beta	3-Layer(aba) Sandwich	Protein Transport Mog1p	Chain A	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01789	PsbP (PsbP)	PsbP	This entry consists of the 23 kDa subunit of oxygen evolving system of photosystem II or PsbP from various plants (where it is encoded by the nuclear genome) and Cyanobacteria (known as CyanoP). The 23 KDa PsbP protein is required for PSII to be ful ...	This entry consists of the 23 kDa subunit of oxygen evolving system of photosystem II or PsbP from various plants (where it is encoded by the nuclear genome) and Cyanobacteria (known as CyanoP). The 23 KDa PsbP protein is required for PSII to be fully operational in vivo, it increases the affinity of the water oxidation site for Cl- and provides the conditions required for high affinity binding of Ca2+ [2]. Structure of CyanoP from Synechocystis sp. revealed that it has an alpha-beta-alpha fold containing 10 beta strands organized into two anti-parallel beta-sheets, packed against alpha-helices. This entry covers the first seven beta-stands (beta1-beta7) and the N-terminal alpha-helix [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	PSBP PROTEIN	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding	photosynthesis metabolic process cellular process	intracellular anatomical structure plasma membrane-derived chromatophore membrane membrane plasma membrane intracellular membraneless organelle plasma membrane-derived chromatophore thylakoid membrane intracellular organelle cell periphery cellular anatomical structure plasma membrane-derived thylakoid membrane organelle membraneless organelle plasma membrane region intracellular anatomical structure plasma membrane-derived chromatophore membrane membrane plasma membrane intracellular membraneless organelle plasma membrane-derived chromatophore thylakoid membrane intracellular organelle cell periphery cellular anatomical structure plasma membrane-derived thylakoid membrane organelle membraneless organelle plasma membrane region bacterial thylakoid cytoplasm photosynthetic membrane thylakoid extrinsic component of membrane protein-containing complex photosystem catalytic complex photosystem II membrane protein complex photosystem II oxygen evolving complex oxidoreductase complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR002683	PsbP, C-terminal	Domain
A	IPR016123	Mog1/PsbP, alpha/beta/alpha sandwich	Homologous Superfamily

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.