1N4D

The Ligand-Free Structure of E coli BtuF, the Periplasmic Binding Protein for Vitamin B12

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)	Vitamin B12 transport protein btuF	polymer	252	28140.7	2	UniProt (P37028) Pfam (PF01497)	Escherichia coli

Sequence modifications

A, B: 1 - 244 (UniProt: P37028)

PDB	External Database	Details
Mse 47	Met 69	modified residue
Mse 83	Met 105	modified residue
Leu 245	-	expression tag
Glu 246	-	expression tag
His 247	-	expression tag
His 248	-	expression tag
His 249	-	expression tag
His 250	-	expression tag
His 251	-	expression tag
His 252	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	56281.4
All*	Total formula weight	56281.4

*Water molecules are not included.