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Molecular and Cellular Biology, February 2004, p. 1143-1154, Vol. 24, No. 3
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.3.1143-1154.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

The Drosophila Poly(A) Binding Protein-Interacting Protein, dPaip2, Is a Novel Effector of Cell Growth

Guylaine Roy,1 Mathieu Miron,1 Kianoush Khaleghpour,1 Paul Lasko,2 and Nahum Sonenberg1*

Department of Biochemistry and McGill Cancer Centre, McGill University, Montréal, Québec H3G 1Y6,1 Department of Biology, McGill University, Montréal, Québec H3A 1B1, Canada2

Received 7 August 2003/ Returned for modification 25 September 2003/ Accepted 31 October 2003

The 3' poly(A) tail of eukaryotic mRNAs and the poly(A) binding protein (PABP) play important roles in the regulation of translation. Recently, a human PABP-interacting protein, Paip2, which disrupts the PABP-poly(A) interaction and consequently inhibits translation, was described. To gain insight into the biological role of Paip2, we studied the Drosophila melanogaster Paip2 (dPaip2). dPaip2 is the bona fide human Paip2 homologue, as it interacts with dPABP, inhibits binding of dPABP to the mRNA poly(A) tail, and reduces translation of a reporter mRNA by ~80% in an S2 cell-free translation extract. Ectopic overexpression of dPaip2 in Drosophila wings and wing discs results in a size reduction phenotype, which is due to a decrease in cell number. Clones of cells overexpressing dPaip2 in wing discs also contain fewer cells than controls. This phenotype can be explained by a primary effect on cell growth. Indeed, overexpression of dPaip2 in postreplicative tissues inhibits growth, inasmuch as it reduces ommatidia size in eyes and cell size in the larval fat body. We conclude that dPaip2 inhibits cell growth primarily by inhibiting protein synthesis.

* Corresponding author. Mailing address: Department of Biochemistry and McGill Cancer Centre, McGill University, 3655 Promenade Sir William Osler, Montréal, Québec H3G 1Y6, Canada. Phone: (514) 398-7274. Fax: (514) 398-1287. E-mail: nahum.sonenberg{at}mcgill.ca.

Molecular and Cellular Biology, February 2004, p. 1143-1154, Vol. 24, No. 3
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.3.1143-1154.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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