7LKL

The internal aldimine form of the wild-type Salmonella typhimurium Tryptophan Synthase in complex with inhibitor N-(4'-trifluoromethoxybenzenesulfonyl)-2-amino-1-ethylphosphate (F9F) at the enzyme alpha-site, cesium ion at the metal coordination site and the product L-tryptophan at the enzyme beta-site at 1.05 Angstrom resolution. One of the beta-Q114 rotamer conformations allows a hydrogen bond to form with the PLP oxygen at the position 3 in the ring

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A (A)	Tryptophan synthase alpha chain	polymer	268	28698.8	1	UniProt (A0A0D6FWC1) Pfam (PF00290) UniProt (by SIFTS) (P00929)	Salmonella enterica subsp. enterica serovar Typhimurium
2	B (B)	Tryptophan synthase beta chain	polymer	397	42918.9	1	UniProt (P0A2K1) Pfam (PF00291)	Salmonella enterica subsp. enterica serovar Typhimurium
3	C (A)	2-({[4-(TRIFLUOROMETHOXY)PHENYL]SULFONYL}AMINO)ETHYL DIHYDROGEN PHOSPHATE	non-polymer		365.2	1	Chemie (F9F)
4	BA, CA, D, F, G... (B, A)	DIMETHYL SULFOXIDE	non-polymer		78.1	13	Chemie (DMS)
5	E, O (A, B)	TRYPTOPHAN	non-polymer		204.2	2	Chemie (TRP)
6	DA, EA, FA, GA, J... (B, A)	1,2-ETHANEDIOL	non-polymer		62.1	9	Chemie (EDO)
7	IA, JA, KA, L, M (B, A)	CESIUM ION	non-polymer		132.9	5	Chemie (CS)
8	LA, MA, N, NA (B, A)	CHLORIDE ION	non-polymer		35.5	4	Chemie (CL)
9	AA, S, Y (B)	DI(HYDROXYETHYL)ETHER	non-polymer		106.1	3	Chemie (PEG)
10	HA (B)	PYRIDOXAL-5'-PHOSPHATE	non-polymer		247.1	1	Chemie (PLP)
11	OA, PA (A, B)	water	water		18.0	840	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	71617.7
Non-Polymers*	Number of molecules	38
	Total formula weight	3719.8
All*	Total formula weight	75337.5

*Water molecules are not included.