2A5F

Cholera toxin A1 subunit bound to its substrate, NAD+, and its human protein activator, ARF6

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A (A)	ADP-ribosylation factor 6	polymer	175	20110.2	1	UniProt (P62330) Pfam (PF00025)	Homo sapiens (human)
2	B (B)	Cholera enterotoxin, A chain	polymer	193	21710.8	1	UniProt (P01555) Pfam (PF01375)	Vibrio cholerae	NAD(+)--diphthamide ADP-ribosyltransferase, Cholera enterotoxin A subunit
3	C (A)	MAGNESIUM ION	non-polymer		24.3	1	Chemie (MG) PubChem (888)
4	D (A)	GUANOSINE-5'-TRIPHOSPHATE	non-polymer		523.2	1	Chemie (GTP) PubChem (177679032) PubChem (135400627) PubChem (135487750) PubChem (136088935) PubChem (136803486) PubChem (135398633) PubChem (135544356) PubChem (135547949) PubChem (135600366) PubChem (135749822) PubChem (136005188) PubChem (136073923) PubChem (136240914) PubChem (136664747) PubChem (136772743) PubChem (136772744) PubChem (136803487) PubChem (137286749) PubChem (164715984) PubChem (171699466)
5	E (B)	SODIUM ION	non-polymer		23.0	1	Chemie (NA) PubChem (923)
6	F (B)	NICOTINAMIDE-ADENINE-DINUCLEOTIDE	non-polymer		663.4	1	Chemie (NAD)
7	G (B)	GLYCEROL	non-polymer		92.1	1	Chemie (GOL) PubChem (753)
8	H, I (A, B)	water	water		18.0	169	Chemie (HOH)

Sequence modifications

A: 2 - 175 (UniProt: P62330)

PDB	External Database	Details
Met 1	-	initiating methionine

B: 1 - 192 (UniProt: P01555)

PDB	External Database	Details
Ser 0	-	cloning artifact
Asp 110	Glu 128	engineered mutation
Asp 112	Glu 130	engineered mutation
Ser 187	Cys 205	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	41820.9
Non-Polymers*	Number of molecules	5
	Total formula weight	1326.0
All*	Total formula weight	43146.9

*Water molecules are not included.