4HH0

Dark-state structure of AppA C20S without the Cys-rich region from Rb. sphaeroides

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	SCOP2B Superfamily	Acylphosphatase/BLUF domain-like	8034900	3000165	SCOP2B (2021-05-27)
B	SCOP2B Superfamily	Acylphosphatase/BLUF domain-like	8034900	3000165	SCOP2B (2021-05-27)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF21961	e4hh0A4	A: alpha arrays	X: Methionine synthase domain-like (From Topology)	H: Methionine synthase domain-like (From Topology)	T: Methionine synthase domain-like	F: PF21961	ECOD (1.6)
A	PF04940	e4hh0A2	A: a+b two layers	X: Alpha-beta plaits	H: Acylphosphatase-like (From Topology)	T: Acylphosphatase-like	F: PF04940	ECOD (1.6)
A	PF21966	e4hh0A3	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: CheY-like	F: PF21966	ECOD (1.6)
B	PF21961	e4hh0B12	A: alpha arrays	X: Methionine synthase domain-like (From Topology)	H: Methionine synthase domain-like (From Topology)	T: Methionine synthase domain-like	F: PF21961	ECOD (1.6)
B	PF04940	e4hh0B11	A: a+b two layers	X: Alpha-beta plaits	H: Acylphosphatase-like (From Topology)	T: Acylphosphatase-like	F: PF04940	ECOD (1.6)
B	PF21966	e4hh0B1	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: CheY-like	F: PF21966	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.70.100	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)
A	1.10.1240.10	Mainly Alpha	Orthogonal Bundle	Methyltransferase, Methionine Synthase (B12-binding Domains)	Chain A, domain 1	CATH (4.3.0)
A	3.40.50.280	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Cobalamin-binding domain	CATH (4.3.0)
B	3.30.70.100	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)
B	1.10.1240.10	Mainly Alpha	Orthogonal Bundle	Methyltransferase, Methionine Synthase (B12-binding Domains)	Chain A, domain 1	CATH (4.3.0)
B	3.40.50.280	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Cobalamin-binding domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF21961	AppA, four helix bundle (AppA_4HB)	AppA, four helix bundle	This domain is found in AppA protein from Rhodobacter sphaeroides and similar sequences from alphaproteobacteria. AppA is a light -sensing antirepressor involved in oxygen and light control of photosynthesis-gene expression. This protein senses blue- ...	This domain is found in AppA protein from Rhodobacter sphaeroides and similar sequences from alphaproteobacteria. AppA is a light -sensing antirepressor involved in oxygen and light control of photosynthesis-gene expression. This protein senses blue-light via its N-terminal sensor of blue-light using FAD (BLUF) domain (Pfam:PF04940) and oxygen via its SCHIC (sensor containing heme instead of cobalamin) domain. This entry represents the domain that locates in between them, which folds as a four helix bundle (4HB) and acts as a binding platform for the adjacent domains [1-2].	Domain
A, B	PF21966	AppA, sensor containing heme instead of cobalamin (AppA_SCHIC)	AppA, sensor containing heme instead of cobalamin	This domain is found at the C-terminal end of AppA protein from Rhodobacter sphaeroides and similar sequences from alphaproteobacteria. AppA is a light-sensing antirepressor involved in oxygen and light control of photosynthesis-gene expression. This ...	This domain is found at the C-terminal end of AppA protein from Rhodobacter sphaeroides and similar sequences from alphaproteobacteria. AppA is a light-sensing antirepressor involved in oxygen and light control of photosynthesis-gene expression. This protein senses blue-light via its N-terminal blue-light using FAD (BLUF) domain (Pfam:PF04940) and oxygen via its sensor containing heme instead of cobalamin (SCHIC) domain (this entry). This domain has a flavodoxin-like fold [1,2].	Domain
A, B	PF04940	Sensors of blue-light using FAD (BLUF)	Sensors of blue-light using FAD	The BLUF domain has been shown to bind FAD in the AppA protein (Swiss:Q53119). AppA is involved in the repression of photosynthesis genes in response to blue-light.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	AppA protein	blue light photoreceptor activity molecular transducer activity photoreceptor activity signaling receptor activity FAD binding flavin adenine dinucleotide binding binding nucleoside phosphate binding ion binding organic cyclic compound binding anion binding nucleotide binding heterocyclic compound binding small molecule binding	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR007024	BLUF domain	Domain
A, B	IPR036046	Acylphosphatase-like domain superfamily	Homologous Superfamily
A, B	IPR036594	Methionine synthase domain	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 R01GM133198.