3IFX

Crystal structure of the Spin-labeled KcsA mutant V48R1

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	Voltage-gated potassium channel	polymer	129	13942.4	4	UniProt (P0A334) Pfam (PF00520) Pfam (PF07885) In PDB	Streptomyces lividans
2	A, B	POTASSIUM ION	non-polymer		39.1	2	Chemie (K)
3	A, B, C, D	S-[(1-oxyl-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrol-3-yl)methyl] methanesulfonothioate	non-polymer		264.4	4	Chemie (MTN)
4	B	TETRABUTYLAMMONIUM ION	non-polymer		242.5	1	Chemie (TBA)
5		water	water		18.0	3	Chemie (HOH)

Sequence modifications

A, B, C, D: 1 - 123 (UniProt: P0A334)

PDB	External Database	Details
Cys 48	Val 48	engineered mutation
His 124	-	expression tag
His 125	-	expression tag
His 126	-	expression tag
His 127	-	expression tag
His 128	-	expression tag
His 129	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	55769.5
Non-Polymers*	Number of molecules	7
	Total formula weight	1378.2
All*	Total formula weight	57147.7

*Water molecules are not included.