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Molecular and Cellular Biology, June 2002, p. 3959-3969, Vol. 22, No. 12
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.12.3959-3969.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Regulation of c-myc mRNA Decay by Translational Pausing in a Coding Region Instability Determinant

Ira Lemm and Jeff Ross*

McArdle Laboratory for Cancer Research, University of Wisconsin—Madison, Madison, Wisconsin 53706

Received 13 December 2001/ Returned for modification 19 February 2002/ Accepted 11 March 2002

A 249-nucleotide coding region instability determinant (CRD) destabilizes c-myc mRNA. Previous experiments identified a CRD-binding protein (CRD-BP) that appears to protect the CRD from endonuclease cleavage. However, it was unclear why a CRD-BP is required to protect a well-translated mRNA whose coding region is covered with ribosomes. We hypothesized that translational pausing in the CRD generates a ribosome-deficient region downstream of the pause site, and this region is exposed to endonuclease attack unless it is shielded by the CRD-BP. Transfection and cell-free translation experiments reported here support this hypothesis. Ribosome pausing occurs within the c-myc CRD in tRNA-depleted reticulocyte translation reactions. The pause sites map to a rare arginine (CGA) codon and to an adjacent threonine (ACA) codon. Changing these codons to more common codons increases translational efficiency in vitro and increases mRNA abundance in transfected cells. These data suggest that c-myc mRNA is rapidly degraded unless it is (i) translated without pausing or (ii) protected by the CRD-BP when pausing occurs. Additional mapping experiments suggest that the CRD is bipartite, with several upstream translation pause sites and a downstream endonuclease cleavage site.

* Corresponding author. Mailing address: McArdle Laboratory for Cancer Research, University of Wisconsin—Madison, 1400 University Ave., Madison, WI 53706. Phone: (608) 262-3413. Fax: (608) 262-2824. E-mail: ross{at}oncology.wisc.edu.

Molecular and Cellular Biology, June 2002, p. 3959-3969, Vol. 22, No. 12
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.12.3959-3969.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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