1S5E

Cholera holotoxin, Crystal form 1

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, G (A, B)	Cholera enterotoxin, A chain precursor	polymer	240	27229.0	2	UniProt (P01555) Pfam (PF01375)	Vibrio cholerae	NAD(+)--diphthamide ADP- ribosyltransferase, Cholera enterotoxin A subunit
2	B, C, D, E, F... (D, E, F, G, H...)	cholera toxin B protein (CTB)	polymer	103	11623.3	10	UniProt (P01556) Pfam (PF01376)	Vibrio cholerae
3	M, O (A, B)	SODIUM ION	non-polymer		23.0	2	Chemie (NA)
4	N, P (D, J)	beta-D-galactopyranose	non-polymer		180.2	2	Chemie (GAL)
5	AA, BA, Q, R, S... (M, N, A, D, E...)	water	water		18.0	748	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	12
	Total formula weight	170690.6
Non-Polymers*	Number of molecules	4
	Total formula weight	406.3
All*	Total formula weight	171096.9

*Water molecules are not included.