1BMT

HOW A PROTEIN BINDS B12: A 3.O ANGSTROM X-RAY STRUCTURE OF THE B12-BINDING DOMAINS OF METHIONINE SYNTHASE

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (A, B)	METHIONINE SYNTHASE	polymer	246	27209.2	2	UniProt (P13009) Pfam (PF02607) Pfam (PF02310)	Escherichia coli
2	C, D (A, B)	CO-METHYLCOBALAMIN	non-polymer		1344.4	2	Chemie (COB)
3	E, F (A, B)	water	water		18.0	2	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	54418.3
Non-Polymers*	Number of molecules	2
	Total formula weight	2688.8
All*	Total formula weight	57107.1

*Water molecules are not included.