Article (Scientific journals)
Regulation of insulin secretion by SIRT4, a mitochondrial ADP-ribosyltransferase
Ahuja, Nidhi; Schwer, Bjoern; Carobbio, Stefania et al.
2007In Journal of Biological Chemistry, 282 (46)
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Abstract :
[en] Sirtuins are homologues of the yeast transcriptional repressor Sir2p and are conserved from bacteria to humans. We report that human SIRT4 is localized to the mitochondria. SIRT4 is a matrix protein and becomes cleaved at amino acid 28 after import into mitochondria. Mass spectrometry analysis of proteins that coimmunoprecipitate with SIRT4 identified insulin degrading enzyme and the ADP/ATP carrier proteins, ANT2 and ANT3. SIRT4 exhibits no histone deacetylase activity but functions as an efficient ADP-ribosyltransferase on histones and bovine serum albumin. SIRT4 is expressed in islets of Langerhans and colocalizes with insulin-expressing beta cells. Depletion of SIRT4 from insulin-producing INS-1E cells results in increased insulin secretion in response to glucose. These observations define a new role for mitochondrial SIRT4 in the regulation of insulin secretion.
Disciplines :
Biochemistry, biophysics & molecular biology
Endocrinology, metabolism & nutrition
Author, co-author :
Ahuja, Nidhi;  University of California > Gladstone Institute of Virology and Immunology
Schwer, Bjoern;  University of California > Gladstone Institute of Virology and Immunology
Carobbio, Stefania;  University of Geneva > University Medical Center > Department of Cell Physiology and Metabolism
Waltregny, David  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Labo de recherche sur les métastases
North, Brian J.;  University of California > Gladstone Institute of Virology and Immunology
Castronovo, Vincenzo ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Biologie générale et cellulaire
Maechler, Pierre;  University of Geneva > University Medical Center > Department of Cell Physiology and Metabolism
Verdin, Eric;  University of California > Gladstone Institute of Virology and Immunology
Language :
English
Title :
Regulation of insulin secretion by SIRT4, a mitochondrial ADP-ribosyltransferase
Publication date :
16 November 2007
Journal title :
Journal of Biological Chemistry
ISSN :
0021-9258
eISSN :
1083-351X
Publisher :
Amer Soc Biochemistry Molecular Biology Inc, Bethesda, United States - Maryland
Volume :
282
Issue :
46
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 January 2009

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