Methylation of histone H3 by coactivator-associated arginine methyltransferase 1

Biochemistry
B T SchurterD W Aswad

Abstract

The preferential in vitro methylation of histone H3 by coactivator-associated arginine methyltransferase 1 (CARM1) has been proposed as a basis for its ability to enhance gene transcription [Chen, D., et al. (1999) Science 284, 2174-2177]. To further evaluate the significance of H3 methylation, we studied the kinetics and site specificity of its modification by CARM1. Affinity-purified CARM1 methylated recombinant chick H3, which is free of posttranslational modifications, and calf thymus H3, which is heterogeneous with regard to preexisting modifications, equally well, exhibiting a V(max) of 4500 pmol min(-1) (mg of enzyme)(-1) and an apparent K(m) for H3 of < or = 0.2 microM. The catalytic efficiency (k(cat)/K(m)) of CARM1 toward H3 was at least 1000 times that toward R1 (GGFGGRGGFGG-amide), a highly effective substrate for protein arginine methyltransferase 1. Peptide mapping of 3H-methyl-labeled H3 indicated methylation at Arg-2, Arg-17, and Arg-26 in the N-terminal region and at one or more of four arginines (128/129/131/134) at the C-terminus. Two of the N-terminal sites, Arg-17 and Arg-26, occur in the sequence KAXRK and appear to be more efficiently methylated than Arg-2. CARM1 catalyzed formation of N(G),N(G)-dimethyla...Continue Reading

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