4JNJ

Structure based engineering of streptavidin monomer with a reduced biotin dissociation rate

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 (A, B, C, D)	Streptavidin/Rhizavidin Hybrid	polymer	115	12591.3	4		Streptomyces avidinii
2	E, I, M, O (A, B, C, D)	BIOTIN	non-polymer		244.3	4	Chemie (BTN)
3	F, G, H, J, K... (A, B, C, D)	ZINC ION	non-polymer		65.4	9	Chemie (ZN)
4	R, S, T, U (A, B, C, D)	water	water		18.0	218	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	50365.3
Non-Polymers*	Number of molecules	13
	Total formula weight	1565.9
All*	Total formula weight	51931.3

*Water molecules are not included.