2KEK

Solution structure of a dimer of LAC repressor DNA-binding domain complexed to its natural operator O3

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B	Lactose operon repressor	polymer	62	6822.8	2	UniProt (P03023) Pfam (PF00356) In PDB	Escherichia coli
2	C	DNA (5'-D(*CP*GP*GP*CP*AP*GP*TP*GP*AP*GP*CP*GP*CP*AP*AP*CP*GP*CP*AP*AP*TP*TP*C)-3')	polymer	23	7075.6	1
3	D	DNA (5'-D(P*GP*AP*AP*TP*TP*GP*CP*GP*TP*TP*GP*CP*GP*CP*TP*CP*AP*CP*TP*GP*CP*CP*G)-3')	polymer	23	7048.5	1

Sequence modifications

A, B: 1 - 62 (UniProt: P03023)

PDB	External Database	Details
Cys 52	Val 52	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	27769.6
All*	Total formula weight	27769.6

*Water molecules are not included.