1SWE

APO-CORE-STREPTAVIDIN IN COMPLEX WITH BIOTIN AT PH 4.5

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	STREPTAVIDIN	polymer	127	13281.3	4	UniProt (P22629) Pfam (PF01382) In PDB	Streptomyces avidinii	CORE STREPTAVIDIN
2	A, B, C, D	BIOTIN	non-polymer		244.3	4	Chemie (BTN)
3		water	water		18.0	302	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	53125.3
Non-Polymers*	Number of molecules	4
	Total formula weight	977.2
All*	Total formula weight	54102.6

*Water molecules are not included.