1gol
COORDINATES OF RAT MAP KINASE ERK2 WITH AN ARGININE MUTATION AT POSITION 52
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OverviewOverview
Among the protein kinases, an absolutely conserved lysine in subdomain II, is required for high catalytic activity. This lysine is known to interact, with the substrate ATP, but otherwise its role is not well understood. We, have used biochemical and structural methods to investigate the function, of this lysine (K52) in phosphoryl transfer reactions catalyzed by the MAP, kinase ERK2. The kinetic properties of activated wild-type ERK2 and K52, mutants were examined using the oncoprotein TAL2, myelin basic protein, and a designed synthetic peptide as substrates. The catalytic activities, of K52R and K52A ERK2 were lower than that of wild-type ERK2, primarily as, a consequence of reductions in kcat. Further, there was little difference, in Km for ATP, but the Km,app for peptide substrate was higher for the K52, mutants. The three-dimensional structure of unphosphorylated K52R ERK2 in, the absence and presence of bound ATP was determined and compared with the, structure of unphosphorylated wild-type ERK2. ATP adopted a well-defined, but distinct binding mode in K52R ERK2 compared to the binding mode in the, wild-type enzyme. The structural and kinetic data show that mutation of, K52 created a nonproductive binding mode for ATP and suggest that K52 is, essential for orienting ATP for catalysis.
About this StructureAbout this Structure
1GOL is a Single protein structure of sequence from Rattus norvegicus with MG and ATP as ligands. Full crystallographic information is available from OCA.
ReferenceReference
Mutation of position 52 in ERK2 creates a nonproductive binding mode for adenosine 5'-triphosphate., Robinson MJ, Harkins PC, Zhang J, Baer R, Haycock JW, Cobb MH, Goldsmith EJ, Biochemistry. 1996 May 7;35(18):5641-6. PMID:8639522
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