4NC2

Crystal structure of TcdB-B1 bound to B39 VHH

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	Toxin B	polymer	126	14868.2	1	UniProt (P18177) Pfam (PF01473) In PDB	Clostridium difficile
2	B	B39 VHH	polymer	141	15626.1	1		Lama glama
3		water	water		18.0	11	Chemie (HOH)

Sequence modifications

A: 8 - 126 (UniProt: P18177)

PDB	External Database	Details
Met 1	-	expression tag
His 2	-	expression tag
His 3	-	expression tag
His 4	-	expression tag
His 5	-	expression tag
His 6	-	expression tag
His 7	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	30494.3
All*	Total formula weight	30494.3

*Water molecules are not included.