2OCT

Stefin B (Cystatin B) tetramer

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B	Cystatin B	polymer	98	11163.5	2	UniProt (P04080) Pfam (PF00031) In PDB	Homo sapiens (human)	Liver thiol proteinase inhibitor, CPI-B, Stefin B
2		water	water		18.0	172	Chemie (HOH)

Sequence modifications

A, B: 1 - 98 (UniProt: P04080)

PDB	External Database	Details
Ser 3	Cys 3	engineered mutation
Tyr 31	Glu 31	variant
Ser 79	Pro 79	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	22327.1
All*	Total formula weight	22327.1

*Water molecules are not included.