4J7C

KtrAB potassium transporter from Bacillus subtilis

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, E...	Ktr system potassium uptake protein A	polymer	222	24912.7	8	UniProt (O32080) Pfam (PF02254) Pfam (PF02080) In PDB	Bacillus subtilis	K(+)-uptake protein KtrA
2	I, J, K, L	Ktr system potassium uptake protein B	polymer	465	50642.9	4	UniProt (O32081) Pfam (PF02386) In PDB	Bacillus subtilis	K(+)-uptake protein KtrB
3	A, B, C, D, E...	ADENOSINE-5'-TRIPHOSPHATE	non-polymer		507.2	8	Chemie (ATP)
4	I, J, K, L	POTASSIUM ION	non-polymer		39.1	4	Chemie (K)

Sequence modifications

A, B, C, D, E, F, G, H: 1 - 222 (UniProt: O32080)

PDB	External Database	Details
Val 22	Cys 22	engineered mutation

I, J, K, L: 1 - 445 (UniProt: O32081)

PDB	External Database	Details
Met -19	-	expression tag
Gly -18	-	expression tag
Ser -17	-	expression tag
Ser -16	-	expression tag
His -15	-	expression tag
His -14	-	expression tag
His -13	-	expression tag
His -12	-	expression tag
His -11	-	expression tag
His -10	-	expression tag
Ser -9	-	expression tag
Ser -8	-	expression tag
Gly -7	-	expression tag
Leu -6	-	expression tag
Val -5	-	expression tag
Pro -4	-	expression tag
Arg -3	-	expression tag
Gly -2	-	expression tag
Ser -1	-	expression tag
His 0	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	12
	Total formula weight	401873.5
Non-Polymers*	Number of molecules	12
	Total formula weight	4213.8
All*	Total formula weight	406087.4

*Water molecules are not included.