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Identification of bovine glutamate dehydrogenase as an RNA-binding protein

Lookup NU author(s): Dr Andrew Hall, Professor Robert Lightowlers


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Two RNA binding activities were demonstrated in bovine liver homogenate. One binding protein was isolated by a simple ion exchange and gel filtration protocol and was shown by N-terminal protein sequence analysis to be glutamate dehydrogenase. Using identical RNA substrate and assay conditions, no detectable RNA binding was observed with equimolar amounts of other representative dehydrogenases and proteins. Furthermore, excesses of tRNA, salmon testis DNA, or each of the four homoribopolymers were unable to compete for the RNA-binding site. Total cytosolic RNA, however, successfully prevented binding of radiolabeled RNA substrate. These data are consistent with glutamate dehydrogenase containing a binding site for heteropolymeric RNA with highest affinity for an as yet undefined nucleotide consensus sequence or structure. The potential physiological relevance of these observations is discussed.

Publication metadata

Author(s): Preiss T, Hall AG, Lightowlers RN

Publication type: Note

Publication status: Published

Journal: Journal of Biological Chemistry

Year: 1993

Volume: 268

Issue: 33

Pages: 24523-24526

Print publication date: 01/11/1993

ISSN (print): 0021-9258

ISSN (electronic): 1083-351X


PubMed id: 8227006