|3cbb, resolution 2.00Å ()|
|Gene:||HNF4A, HNF4, NR2A1, TCF14 (Homo sapiens)|
Crystal Structure of Hepatocyte Nuclear Factor 4alpha in complex with DNA: Diabetes Gene Product
HNF4alpha (hepatocyte nuclear factor 4alpha) plays an essential role in the development and function of vertebrate organs, including hepatocytes and pancreatic beta-cells by regulating expression of multiple genes involved in organ development, nutrient transport, and diverse metabolic pathways. As such, HNF4alpha is a culprit gene product for a monogenic and dominantly inherited form of diabetes, known as maturity onset diabetes of the young (MODY). As a unique member of the nuclear receptor superfamily, HNF4alpha recognizes target genes containing two hexanucleotide direct repeat DNA-response elements separated by one base pair (DR1) by exclusively forming a cooperative homodimer. We describe here the 2.0 angstroms crystal structure of human HNF4alpha DNA binding domain in complex with a high affinity promoter element of another MODY gene, HNF1alpha, which reveals the molecular basis of unique target gene selection/recognition, DNA binding cooperativity, and dysfunction caused by diabetes-causing mutations. The predicted effects of MODY mutations have been tested by a set of biochemical and functional studies, which show that, in contrast to other MODY gene products, the subtle disruption of HNF4alpha molecular function can cause significant effects in afflicted MODY patients.
Structural basis of natural promoter recognition by a unique nuclear receptor, HNF4alpha. Diabetes gene product., Lu P, Rha GB, Melikishvili M, Wu G, Adkins BC, Fried MG, Chi YI, J Biol Chem. 2008 Nov 28;283(48):33685-97. Epub 2008 Oct 1. PMID:18829458
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
[HNF4A_HUMAN] Defects in HNF4A are the cause of maturity-onset diabetes of the young type 1 (MODY1) [MIM:125850]; also symbolized MODY-1. MODY is a form of diabetes that is characterized by an autosomal dominant mode of inheritance, onset in childhood or early adulthood (usually before 25 years of age), a primary defect in insulin secretion and frequent insulin-independence at the beginning of the disease.
[HNF4A_HUMAN] Transcriptionally controlled transcription factor. Binds to DNA sites required for the transcription of alpha 1-antitrypsin, apolipoprotein CIII, transthyretin genes and HNF1-alpha. May be essential for development of the liver, kidney and intestine.
About this Structure
- Lu P, Rha GB, Melikishvili M, Wu G, Adkins BC, Fried MG, Chi YI. Structural basis of natural promoter recognition by a unique nuclear receptor, HNF4alpha. Diabetes gene product. J Biol Chem. 2008 Nov 28;283(48):33685-97. Epub 2008 Oct 1. PMID:18829458 doi:10.1074/jbc.M806213200
- ↑ Furuta H, Iwasaki N, Oda N, Hinokio Y, Horikawa Y, Yamagata K, Yano N, Sugahiro J, Ogata M, Ohgawara H, Omori Y, Iwamoto Y, Bell GI. Organization and partial sequence of the hepatocyte nuclear factor-4 alpha/MODY1 gene and identification of a missense mutation, R127W, in a Japanese family with MODY. Diabetes. 1997 Oct;46(10):1652-7. PMID:9313765
- ↑ Bulman MP, Dronsfield MJ, Frayling T, Appleton M, Bain SC, Ellard S, Hattersley AT. A missense mutation in the hepatocyte nuclear factor 4 alpha gene in a UK pedigree with maturity-onset diabetes of the young. Diabetologia. 1997 Jul;40(7):859-62. PMID:9243109
- ↑ Hani EH, Suaud L, Boutin P, Chevre JC, Durand E, Philippi A, Demenais F, Vionnet N, Furuta H, Velho G, Bell GI, Laine B, Froguel P. A missense mutation in hepatocyte nuclear factor-4 alpha, resulting in a reduced transactivation activity, in human late-onset non-insulin-dependent diabetes mellitus. J Clin Invest. 1998 Feb 1;101(3):521-6. PMID:9449683 doi:10.1172/JCI1403