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.

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, C	PUTATIVE TRANSCRIPTIONAL REGULATOR, ASNC FAMILY	polymer	173	19212.9	2	UniProt (B8J364) Pfam (PF22451) Pfam (PF17805) In PDB	DESULFOVIBRIO DESULFURICANS	AHBA DECARBOXYLASE A CHAIN
2	B, D	PUTATIVE TRANSCRIPTIONAL REGULATOR, ASNC FAMILY	polymer	179	20112.8	2	UniProt (B8J3A4) Pfam (PF22451) Pfam (PF17805) In PDB	DESULFOVIBRIO DESULFURICANS	AHBB DECARBOXYLASE B CHAIN
3	B, C	12,18-DIDECARBOXY-SIROHEME	non-polymer		828.6	2	Chemie (OBV)
4		water	water		18.0	324	Chemie (HOH)

Sequence modifications

B, D: 1 - 159 (UniProt: B8J3A4)

PDB	External Database	Details
Met -19	-	expression tag
Gly -18	-	expression tag
Ser -17	-	expression tag
Ser -16	-	expression tag
His -15	-	expression tag
His -14	-	expression tag
His -13	-	expression tag
His -12	-	expression tag
His -11	-	expression tag
His -10	-	expression tag
Ser -9	-	expression tag
Ser -8	-	expression tag
Gly -7	-	expression tag
Leu -6	-	expression tag
Val -5	-	expression tag
Pro -4	-	expression tag
Arg -3	-	expression tag
Gly -2	-	expression tag
Ser -1	-	expression tag
His 0	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	78651.3
Non-Polymers*	Number of molecules	2
	Total formula weight	1657.3
All*	Total formula weight	80308.5

*Water molecules are not included.