Progress in Nucleic Acid Research and Molecular Biology, by Waldo E. Cohn, Kivie Moldave

By Waldo E. Cohn, Kivie Moldave

Compliment for the sequence: ''Full of curiosity not just for the molecular biologist - for whom the various references could be worthwhile - yet also will attract a wider circle of biologists, and actually to all people who are involved in the dwelling cell.'' --British scientific magazine Key gains * offers a discussion board for dialogue of latest discoveries, methods, and concepts in molecular biology * Contributions from leaders of their fields * considerable references

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Thermal stability of tRNA of hyperthermophilic archaea grown at 100°C may be dependent on the tRNA's unique content of both ac4Cm and mgGm, and of m5s2U found at the position of m5U, (87). Hydrogen-bonding of bases to ribose is inhibited by methylation of the 2'-OH. Therefore, 2'-O-methylations are examples of modijications that reduce noncanonical base pairing, the fourth physicochemical contribution of modifications (Table I). A number of single, double, and triple methylations and methylthiolations of adenosine are included among the nonpolar derivatizations: m2A, m6A, mgA, m6Am, m:Am, and ms2m6A.

V. Examples of Biophysical Contributions to Function by Modified Nucleosides Modifications of RNA nucleosides that alkylate ring nitrogens, exocyclic amines, and ring carbons alter nucleoside chemical properties in two ways. Alkylated imines and amines disrupt canonical base pairing, the fifth modified nucleoside contribution to RNA structure (Table I). Together with ring carbon alkylations, alkylated imines and amines also enhance base stacking interactions by producing more hydrophobic bases (Table I, number 6).

There are four approaches to the synthesis of RNAs with site-selectively positioned modified nucleosides, one in vivo and three in vitro. The in uitro methods include manual solution or column-supported syntheses, enzymatic and automated chemical syntheses combined, and automated chemical synthesis alone. Physicochemical studies of modified nucleoside-containing RNAs requires milligram quantities of highly purified nucleic acid. The advantages and disadvantages of the four methods are compared in Table 111.

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