Effect of Analogues of -Adenosylmethionine on Polyadenylation by Vesicular Stomatitis Virus Free

Abstract

SUMMARY

Other workers have reported that vesicular stomatitis virus makes aberrantly long polyadenylic acid [poly(A)] tracts in the presence of -adenosylhomocysteine (S-Ado-Hcy). In the work reported in this paper, the effects of various analogues of adenosylmethionine (S-Ado-Met) and ATP on polyadenylation in an transcription system were examined to determine whether S-Ado-Hcy exerted its effect on polyadenylation due to its relationship to S-Ado-Met or to ATP. It appeared that compounds which affected polyadenylation were those which were closely related to S-Ado-Met and that had the same L-aminoacyl side chain [(COOH)–CH(NH)2–CH2–CH–]; the nature of the substituent at the –S(CH)– position of S-Ado-Met was less important. These analogues appeared to compete with S-Ado-Met for a binding site(s). These data support a model whereby compounds binding at an S-Ado-Met-binding site may have allosteric effects by causing or preventing conformational changes which are involved in polyadenylation reactions, perhaps by affecting the rate of polyadenylation or of termination.

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1989-03-01
2024-03-29
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