| Literature DB >> 17605 |
Abstract
An S-adenosylmethionine-dependent tRNA(adenine-1)-methyltransferase has been purified 8,000-fold from rat liver. This preparation gives a single band on polyacrylamide gel electrophoresis and is stable in long term storage. The enzyme has a molecular weight of approximately 95,000. The single methylating capacity of this adenine-1 methyltransferase, using Escherichia coli tRNA2Glu, is methylation of the invariant adenine in the GTpsiC loop. The methylation reaction is dependent on added cation with 20 to 40 mM putrescine being most effective. The Km for S-adenosylmethionine was found to be 0.3 micron, while the Ki for the product inhibitor S-adenosylhomocysteine was 0.85 micron. The Km for tRNAMetf is 12 nM while that for tRNAGlu2 is 33 nM.Entities:
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Year: 1977 PMID： 17605
Source DB: PubMed Journal: J Biol Chem ISSN： 0021-9258 Impact factor: 5.157