4UN1

Sirohaem decarboxylase AhbA/B - an enzyme with structural homology to the Lrp/AsnC transcription factor family that is part of the alternative haem biosynthesis pathway.

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	PF22451	e4un1A1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: PF22451	ECOD (1.6)
A	PF17805	e4un1A2	A: a+b two layers	X: Alpha-beta plaits	H: Dimeric alpha+beta barrel (From Topology)	T: Dimeric alpha+beta barrel	F: PF17805	ECOD (1.6)
C	PF22451	e4un1C1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: PF22451	ECOD (1.6)
C	PF17805	e4un1C2	A: a+b two layers	X: Alpha-beta plaits	H: Dimeric alpha+beta barrel (From Topology)	T: Dimeric alpha+beta barrel	F: PF17805	ECOD (1.6)
B	PF22451	e4un1B1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: PF22451	ECOD (1.6)
B	PF17805	e4un1B2	A: a+b two layers	X: Alpha-beta plaits	H: Dimeric alpha+beta barrel (From Topology)	T: Dimeric alpha+beta barrel	F: PF17805	ECOD (1.6)
D	PF22451	e4un1D1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: PF22451	ECOD (1.6)
D	PF17805	e4un1D2	A: a+b two layers	X: Alpha-beta plaits	H: Dimeric alpha+beta barrel (From Topology)	T: Dimeric alpha+beta barrel	F: PF17805	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, C	PF17805	AsnC-like ligand binding domain (AsnC_trans_reg2)	AsnC-like ligand binding domain	This entry contains an AsnC-like ligand binding domain.	Domain
A, C	PF22451	Siroheme decarboxylase NirDL-like HTH domain (NirdL-like_HTH)	Siroheme decarboxylase NirDL-like HTH domain	This entry represents the HTH domains found in siroheme decarboxylase NirdL from Hydrogenobacter thermophilus and related sequences [5]. NirdL is involved in heme d1 biosynthesis. It catalyses the decarboxylation of siroheme into didecarboxysiroheme. ...	This entry represents the HTH domains found in siroheme decarboxylase NirdL from Hydrogenobacter thermophilus and related sequences [5]. NirdL is involved in heme d1 biosynthesis. It catalyses the decarboxylation of siroheme into didecarboxysiroheme.	Domain
B, D	PF17805	AsnC-like ligand binding domain (AsnC_trans_reg2)	AsnC-like ligand binding domain	This entry contains an AsnC-like ligand binding domain.	Domain
B, D	PF22451	Siroheme decarboxylase NirDL-like HTH domain (NirdL-like_HTH)	Siroheme decarboxylase NirDL-like HTH domain	This entry represents the HTH domains found in siroheme decarboxylase NirdL from Hydrogenobacter thermophilus and related sequences [5]. NirdL is involved in heme d1 biosynthesis. It catalyses the decarboxylation of siroheme into didecarboxysiroheme. ...	This entry represents the HTH domains found in siroheme decarboxylase NirdL from Hydrogenobacter thermophilus and related sequences [5]. NirdL is involved in heme d1 biosynthesis. It catalyses the decarboxylation of siroheme into didecarboxysiroheme.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, C	PUTATIVE TRANSCRIPTIONAL REGULATOR, ASNC FAMILY	lyase activity catalytic activity sequence-specific DNA binding DNA binding binding organic cyclic compound binding nucleic acid binding	pigment metabolic process heme metabolic process porphyrin-containing compound biosynthetic process organonitrogen compound metabolic process tetrapyrrole metabolic process heme biosynthetic process organonitrogen compound biosynthetic process pigment biosynthetic process tetrapyrrole biosynthetic process biosynthetic process metabolic process porphyrin-containing compound metabolic process	-
B, D	PUTATIVE TRANSCRIPTIONAL REGULATOR, ASNC FAMILY	lyase activity catalytic activity	pigment metabolic process heme metabolic process porphyrin-containing compound biosynthetic process organonitrogen compound metabolic process tetrapyrrole metabolic process heme biosynthetic process organonitrogen compound biosynthetic process pigment biosynthetic process tetrapyrrole biosynthetic process biosynthetic process metabolic process porphyrin-containing compound metabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, C	IPR036388	Winged helix-like DNA-binding domain superfamily	Homologous Superfamily
A, C	IPR036390	Winged helix DNA-binding domain superfamily	Homologous Superfamily
A, C	IPR040523	Siroheme decarboxylase , AsnC-like ligand binding domain	Domain
A, C	IPR000485	AsnC-type HTH domain	Domain
B, D	IPR036390	Winged helix DNA-binding domain superfamily	Homologous Superfamily
B, D	IPR040523	Siroheme decarboxylase , AsnC-like ligand binding domain	Domain

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.