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Identification of new high mobility group A1 associated proteins
Giovanna Maria Pierantoni, 1 Stéphane Giraud, 2 Willy Vincent Bienvenut, 3 Jean Jacques Diaz, 4 Alfredo Fusco, 5 Francesco Esposito

1  Dipartimento di Biologia e Patologia Cellulare e Molecolare, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli “Federico II”, Naples, Italy
2  Idealp Pharma, Batimen CEI, Villeurbanne, France
3  Protein Analysis Facility, Département de Biochimie, Université de Lausanne, Epalinges, Switzerland
4  Centre de Génétique Moléculaire et Cellulaire, Université Claude Bernard Lyon 1, Villeurbanne, France
5  Dipartimento di Biologia e Patologia Cellulare e Molecolare, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli “Federico II”, via S. Pansini 5, 80131 Naples, Italy Fax: +39‐081‐7463749

Published: 19 September 2007 by Wiley Blackwell (John Wiley & Sons) in PROTEOMICS
Wiley Blackwell (John Wiley & Sons), Volume 7; 10.1002/pmic.200700148
Abstract: High mobility group A (HMGA) proteins (HMGA1a, HMGA1b, HMGA1c and HMGA2) are nonhistone chromosomal proteins that do not have transcriptional activity per se, but they orchestrate the assembly of multiprotein complexes involved in gene transcription, replication and chromatin structure through a complex network of protein–DNA and protein–protein interactions. To better understand their mechanisms of action, we have used a combination of coimmunoprecipitation, 1‐D gel SDS‐PAGE and MS to identify new potential molecular interactors. We have found 11 proteins that associate with HMGA1. These proteins belong to three different classes: mRNA processing proteins, RNA helicases and protein chaperones. Some interactions were confirmed by coimmunoprecipitation and pull‐down experiments in human embryonal kidney 293 cells. These experimental data suggest that HMGA1 proteins can associate with proteins that are strictly involved in chromatin structure and in several important mRNA processing steps, supporting the idea that HMGA1 proteins can also participate in these events.
Keywords: High Mobility Group A1 Proteins, New Interactors, tandem mass spectrometry

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