9BAI

Crystal structure of GDP-bound human K-RAS in a covalent complex with aryl sulfonyl fluoride compounds.

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, C (A, C)	Isoform 2B of GTPase KRas	polymer	169	19255.7	2	UniProt (P01116) Pfam (PF00071)	Homo sapiens (human)	K-Ras 2,Ki-Ras,c-K-ras,c-Ki-ras
2	B, D (B, D)	Isoform 2B of GTPase KRas	polymer	169	19271.7	2	UniProt (P01116) Pfam (PF00071)	Homo sapiens (human)	K-Ras 2,Ki-Ras,c-K-ras,c-Ki-ras
3	E, H, K, N (A, B, C, D)	MAGNESIUM ION	non-polymer		24.3	4	Chemie (MG)
4	F, I, L, O (A, B, C, D)	3-[bis(oxidanylidene)-$l^{5}-sulfanyl]-~{N}-pyridin-4-yl-benzenesulfonamide	non-polymer		298.3	4	Chemie (WMU)
5	G, J, M, P (A, B, C, D)	GUANOSINE-5'-DIPHOSPHATE	non-polymer		443.2	4	Chemie (GDP)
6	Q, R, S, T (A, B, C, D)	water	water		18.0	918	Chemie (HOH)

Sequence modifications

A, C: 1 - 169 (UniProt: P01116)

PDB	External Database	Details
Ser 118	Cys 118	engineered mutation

B, D: 1 - 169 (UniProt: P01116)

PDB	External Database	Details
Ser 118	Cys 118	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	77054.8
Non-Polymers*	Number of molecules	12
	Total formula weight	3063.4
All*	Total formula weight	80118.1

*Water molecules are not included.