Linked Life Data

7592853

Source:http://linkedlifedata.com/resource/pubmed/id/7592853

Statements in which the resource exists.
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pubmed-article:7592853pubmed:abstractTextThe processing endoribonuclease RNase E (Rne), which is encoded by the rne gene, is involved in the maturation process of messenger RNAs and a ribosomal RNA. A number of deletions were constructed in order to assess functional domains of the rne gene product. The expression of the deletion constructs using a T7 promoter/RNA polymerase overproduction system led to the synthesis of truncated Rne polypeptides. The smallest gene fragment in this collection that was able to complement a temperature sensitive rnets mutation and to restore the processing of 9 S RNA was a 2.3-kilobase pair fragment with a 1.9-kilobase pair N-terminal coding sequence that mediated synthesis of a 70.8-kDa polypeptide. Antibodies raised against a truncated 110-kDa polypeptide cross-reacted with the intact rne gene product and with all of the shorter C-terminal truncated polypeptides, indicating that the N-terminal part of the molecule contained strong antigenic determinants. Furthermore, by analyzing the Rne protein and the truncated polypeptides for their ability to bind substrate RNAs, we were able to demonstrate that the central part of the Rne molecule encodes an RNA binding region. Binding to substrate RNAs correlated with the endonucleolytic activity. RNAs that are not substrates for RNase E did not bind to the protein. The two mutated Rne polypeptides expressed from the cloned gene containing either the rne-3071 or ams1 mutation also had the ability to bind 9 S RNA, while their enzymatic function was completely abolished. The data presented here suggest that the endonucleolytic activity is encoded by the N-terminal part of the Rne protein molecule and that the central part of it possesses RNA binding activity.lld:pubmed
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pubmed-article:7592853pubmed:articleTitleEvidence for an RNA binding region in the Escherichia coli processing endoribonuclease RNase E.lld:pubmed
pubmed-article:7592853pubmed:affiliationDepartment of Microbiology, Umeå University, Sweden.lld:pubmed
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