6YTN | pdb_00006ytn

Magnesium chelatase H subunit (ChlH) E660W variant from Synechocystis sp.PCC6803

External Resource: Annotation

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

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A [auth AAA]	WD40	e6ytnAAA1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Aspartate/ornithine carbamoyltransferase	F: WD40	ECOD (v295.2)
B [auth BBB]	WD40	e6ytnBBB1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Aspartate/ornithine carbamoyltransferase	F: WD40	ECOD (v295.2)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth AAA], B [auth BBB]	PF02514	CobN/Magnesium Chelatase (CobN-Mg_chel)	CobN/Magnesium Chelatase	-	Family
A [auth AAA], B [auth BBB]	PF11965	Magnesium chelatase ChlH N-terminal domain (ChlH_N)	Magnesium chelatase ChlH N-terminal domain	This entry represents the N-terminal domain (domain I or 'head' domain) of the magnesium chelatase H subunit (ChlH). The domain is approximately 160 residues long and is found in bacteria, archaea and eukaryotes. It is found preceding the CobN/Mg che ...	This entry represents the N-terminal domain (domain I or 'head' domain) of the magnesium chelatase H subunit (ChlH). The domain is approximately 160 residues long and is found in bacteria, archaea and eukaryotes. It is found preceding the CobN/Mg chelatase domain (Pfam:PF02514). ChlH is the catalytic subunit of magnesium chelatase (EC:6.6.1.1), which inserts Mg2+ into protoporphyrin IX to form Mg-protoporphyrin IX, the first committed step of chlorophyll biosynthesis [1,2]. In Arabidopsis thaliana, the ChlH subunit (Swiss:Q9FNB0, also known as GUN5/ABAR) is additionally involved in plastid-to-nucleus retrograde signalling and abscisic acid perception [3]. The crystal structure of ChlH from Synechocystis sp. PCC 6803 reveals that this N-terminal domain mediates dimerisation through interactions with domain V of the opposing monomer [1]. A mutation at Gly195 within this domain in Synechocystis reduces chlorophyll accumulation, consistent with a role in ChlH function or stability [4].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth AAA], B [auth BBB]	Mg-chelatase subunit ChlH	ligase activity, forming nitrogen-metal bonds ligase activity, forming nitrogen-metal bonds, forming coordination complexes magnesium chelatase activity catalytic activity ligase activity	pigment metabolic process porphyrin-containing compound biosynthetic process tetrapyrrole metabolic process chlorophyll metabolic process pigment biosynthetic process tetrapyrrole biosynthetic process biosynthetic process metabolic process cellular process porphyrin-containing compound metabolic process chlorophyll biosynthetic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth AAA], B [auth BBB]	IPR022571	Magnesium chelatase, subunit H, N-terminal	Domain
A [auth AAA], B [auth BBB]	IPR011771	Magnesium-chelatase, subunit H	Family
A [auth AAA], B [auth BBB]	IPR003672	CobN/magnesium chelatase	Domain