3SSW

E. coli trp aporepressor

Replaces:  1P6Z

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (R, N)	Trp operon repressor	polymer	107	12238.9	2	UniProt (P0A881) Pfam (PF01371)	Escherichia coli
2	C, D (R, N)	water	water		18.0	201	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	24477.9
All*	Total formula weight	24477.9

*Water molecules are not included.