1RG9

S-Adenosylmethionine synthetase complexed with SAM and PPNP

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B, C, D (A, B, C, D)	S-adenosylmethionine synthetase	polymer	383	41867.3	4	UniProt (P0A817) Pfam (PF00438) Pfam (PF02772) Pfam (PF02773)	Escherichia coli	Methionine adenosyltransferase, AdoMet synthetase, MAT
2	E, J, O, V (A, B, C, D)	POTASSIUM ION	non-polymer		39.1	4	Chemie (K)
3	F, G, K, L, P... (A, B, C, D)	MAGNESIUM ION	non-polymer		24.3	8	Chemie (MG)
4	H, M, R, S (A, B, C)	S-ADENOSYLMETHIONINE	non-polymer		398.4	4	Chemie (SAM)
5	I, N, T, X (A, B, C, D)	(DIPHOSPHONO)AMINOPHOSPHONIC ACID	non-polymer		257.0	4	Chemie (PPK)
6	AA, BA, Y, Z (C, D, A, B)	water	water		18.0	20	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	167469.2
Non-Polymers*	Number of molecules	20
	Total formula weight	2972.5
All*	Total formula weight	170441.7

*Water molecules are not included.