4NBX

Crystal Structure of Clostridium difficile Toxin A fragment TcdA-A1 Bound to A20.1 VHH

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A (A)	TcdA	polymer	143	16157.0	1	UniProt (I6YE93) Pfam (PF01473) Pfam (PF19127) UniProt (by SIFTS) (P16154)	Clostridium difficile
2	B (B)	A20.1 VHH	polymer	154	16828.4	1		Lama glama
3	C, D (A, B)	water	water		18.0	247	Chemie (HOH)

Sequence modifications

A: 7 - 143 (UniProt: I6YE93)

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

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	32985.4
All*	Total formula weight	32985.4

*Water molecules are not included.