PubMed · 3796729
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M W Kirschner, T Mitchison. Microtubule dynamics.. https://doi.org/10.1038/324621a0
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We report an industrial scale facile synthesis of 7-methyl guanosine 5'-diphosphate, which plays an important role in synthesis of various mRNA cap analogs. An efficient and selective methylation at position 7 of guanosine 5'-diphosphate was achieved by dissolving guanosine 5'-diphosphate in water and drops wise addition of dimethyl sulfate over a period of 1 h at room temperature. The reaction was completed within 2 h and resulted in more than a 96% yield. The desired product, 7-methyl GDP was purified by using BPG column on AKTA Purifier 100. Certainly, this method has advantages over the known methylation method, in terms of yield, economy, safety, and environmental concerns.
Translocation of peptidyl-tRNA and mRNA within the ribosome during protein synthesis is promoted by the elongation factor EF-G and by the hydrolysis of GTP. A new study reports that EF-G binds to ribosomes as an EF-G.GDP complex and that GTP is exchanged for GDP on the ribosome. Together with cryo-electron microscopy, this unexpected finding helps clarify the role of GTP in translocation.
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