2RTD

STREPTAVIDIN-BIOTIN COMPLEX, PH 1.39, SPACE GROUP I222

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	B, D	STREPTAVIDIN	polymer	135	14181.3	2	UniProt (P22629) Pfam (PF01382) In PDB	Streptomyces avidinii
2	B, D	BIOTIN	non-polymer		244.3	2	Chemie (BTN)
3		water	water		18.0	127	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	28362.6
Non-Polymers*	Number of molecules	2
	Total formula weight	488.6
All*	Total formula weight	28851.3

*Water molecules are not included.