2BB6

Structure of Cobalamin-complexed Bovine Transcobalamin in Monoclinic Crystal Form

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)	Transcobalamin II	polymer	414	46315.2	4	UniProt (Q9XSC9) Pfam (PF01122)	Bos taurus (cattle)	TCII, TC II
2	E, G, I, K (A, B, C, D)	CHLORIDE ION	non-polymer		35.5	4	Chemie (CL)
3	F, H, J, L (A, B, C, D)	COBALAMIN	non-polymer		1330.4	4	Chemie (B12)
4	M, N, O, P (A, B, C, D)	water	water		18.0	764	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	185260.9
Non-Polymers*	Number of molecules	8
	Total formula weight	5463.2
All*	Total formula weight	190724.1

*Water molecules are not included.