3OGC

KcsA E71A variant in presence of Na+

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A (A)	antibody Fab fragment heavy chain	polymer	219	23411.2	1		Mus musculus (mouse)
2	B (B)	antibody Fab fragment light chain	polymer	212	23435.7	1		Mus musculus (mouse)
3	C (C)	Voltage-gated potassium channel	polymer	131	14105.6	1	UniProt (P0A334) Pfam (PF00520) Pfam (PF07885)	Streptomyces lividans
4	D, E (C)	SODIUM ION	non-polymer		23.0	2	Chemie (NA)

Sequence modifications

C: 2 - 124 (UniProt: P0A334)

PDB	External Database	Details
Ser -6	-	expression tag
Met -5	-	expression tag
His -4	-	expression tag
His -3	-	expression tag
His -2	-	expression tag
His -1	-	expression tag
His 0	-	expression tag
His 1	-	expression tag
Ala 71	Glu 71	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	3
	Total formula weight	60952.5
Non-Polymers*	Number of molecules	2
	Total formula weight	46.0
All*	Total formula weight	60998.5

*Water molecules are not included.