2IZI

STREPTAVIDIN-BIOTIN PH 2.53 I4122 STRUCTURE

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	STREPTAVIDIN	polymer	123	12965.0	1	UniProt (P22629) Pfam (PF01382) In PDB	Streptomyces avidinii
2	A	BIOTIN	non-polymer		244.3	1	Chemie (BTN)
3		water	water		18.0	73	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	1
	Total formula weight	12965.0
Non-Polymers*	Number of molecules	1
	Total formula weight	244.3
All*	Total formula weight	13209.3

*Water molecules are not included.