1LCW

streptavidin-homobiotin complex

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B	Streptavidin	polymer	121	12764.8	2	UniProt (P22629) Pfam (PF01382) In PDB	Streptomyces avidinii
2	A, B	HOMOBIOTIN	non-polymer		258.3	2	Chemie (SHM)
3		water	water		18.0	106	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	25529.7
Non-Polymers*	Number of molecules	2
	Total formula weight	516.7
All*	Total formula weight	26046.3

*Water molecules are not included.