1FB1

CRYSTAL STRUCTURE OF HUMAN GTP CYCLOHYDROLASE I

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B, C, D, E (A, B, C, D, E)	GTP CYCLOHYDROLASE I	polymer	196	22105.5	5	UniProt (P30793) Pfam (PF01227)	Homo sapiens (human)	GTP-CH-I
2	F, H, K, L, O (A, B, C, D, E)	ZINC ION	non-polymer		65.4	5	Chemie (ZN)
3	G, I, J, M, N (A, B, D)	ISOPROPYL ALCOHOL	non-polymer		60.1	5	Chemie (IPA)

Contents of the asymmetric unit

Polymers	Number of chains	5
	Total formula weight	110527.4
Non-Polymers*	Number of molecules	10
	Total formula weight	627.5
All*	Total formula weight	111155.0

*Water molecules are not included.