1FUB

FIRST PROTEIN STRUCTURE DETERMINED FROM X-RAY POWDER DIFFRACTION DATA

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, C	INSULIN, A CHAIN	polymer	21	2383.7	2	UniProt (P01308) In PDB
2	B, D	INSULIN, B CHAIN	polymer	30	3434.0	2	UniProt (P01308) Pfam (PF00049) In PDB
3	B, D	ZINC ION	non-polymer		65.4	2	Chemie (ZN)
4	B, D	CHLORIDE ION	non-polymer		35.5	2	Chemie (CL)
5	B	SODIUM ION	non-polymer		23.0	1	Chemie (NA)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	11635.3
Non-Polymers*	Number of molecules	5
	Total formula weight	224.7
All*	Total formula weight	11860.0

*Water molecules are not included.