Advanced Propellant Chemistry by Gould R.F. (ed.)

By Gould R.F. (ed.)

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Catalysis by RNA molecules was reported as early as 1961 [281]. The full significance of the structure of many "ribo-cofactors", first mentioned by Orgel, was appreciated and developed by White [169]. Finally, in what might be regarded as the apogee of theoretical development of this model to date, Visser and Kellogg provided the first clear interpretation of the reactivity and structure of various cofactors in terms of this model [170]. In the 1980s the model became popular with molecular biologists following the surprising discovery of self-splicing messenger RNA molecules and catalytically active RNA involved in the processing of transfer RNA [171-175].

It can therefore occur anywhere in the tertiary structure, even at the active site. Further, as mentioned above, instability appears to be a selected trait in proteins. As there is an overabundance of intramolecular interactions available to a normal sized protein to stabilize a folded conformation [119], the average protein must violate a large number of folding "rules" to engineer a desired level of instability into its structure. This means that even if the biochemist were to learn perfectly the "rules" for folding proteins, he would still find it difficult to predict the tertiary structure of a protein from a single sequence amid all of the violations of the rules placed in the sequence by natural selection.

The alignment can be divided into subgroups having specific minimum pairwise identities (or MPI's). 6. Part of the alignment of the 17 homologous alcohol dehydrogenases shown in the tree in Fig. 7. The dotted line divides alignment into subgroups with minimum pairwise identities (MPI) of 85%, the solid line subgroups with MPI = 50%. 28 Evolution and Structural Theory: The Frontier Between Chemistry and Biology least similar sequences is 85%; the identity between other sequences can, however, be much larger.

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