dSir2 and Dmp53 interact to mediate aspects of CR-dependent life span extension in D. melanogaster
Year: 2008
Type: article
Abstract: Calorie Restriction (CR) is a well established method of extending life span in a variety of organisms. In the fruit fly D. melanogaster, CR is mediated at least in part by activation of dSir2. In mammalian systems, one of the critical targets of Sir2 is the tumor suppressor p53. This deacetylation of p53 by Sir2 leads to inhibition of p53's transcriptional activity. We have recently shown that inhibition of Dmp53 activity in the fly brain through the use of dominant-negative (DN) constructs that inhibit DNA-binding can extend life span. This life span extension appears to be related to CR, as CR and DN-Dmp53 donot display additive effects on life span. Here we report that life span extension by DN-Dmp53 expression is highly dynamic and can be achieved even when DN-Dmp53 is expressed later in life. In addition, we demonstrate that life span extension by activation of dSir2 and DN-Dmp53 expression are not additive. Furthermore, we show that dSir2 physically interacts with Dmp53 and can deacetylate Dmp53-derived peptides. Taken together, our data demonstrate that Dmp53 is a down stream target of dSir2 enzymatic activity and mediates some aspects of the life span extending effects of CR.
Source: Aging
Institution: Brown University
Language: English
Subfield: Aging
Domain: Life Sciences
Open Access status: hybrid
Funder: National Institute on Aging
Awards: Oxidative Damage, Aging and Life Span, Computational Biology of Transcriptional Networks in Aging, Control of Gene Expression and Life Span, G205510599, G2971735499, Molecular Mechanisms of p53 dependent longevity regulation, G4407326004, Control of Gene Expression and Life Span, SINGLE GENE MUTANTS THAT CONFER LONGEVITY IN DROSOPHILA, Single Gene Mutants that Confer Longevity in Drosphila
OpenAlex ID: W2135232891