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Diabetes-associated mutations in a beta-cell transcription factor destabilize an antiparallel "mini-zipper" in a
1Department of Biochemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106-4935, USA.
Summary
Mutations in hepatic nuclear factor 1-alpha (HNF-1alpha) cause a form of diabetes. This study reveals how HNF-1alpha mutations disrupt its structure, leading to impaired dimerization and metabolic deregulation in diabetes.
Area of Science:
- Molecular Biology
- Genetics
- Endocrinology
Background:
- Maturity-onset diabetes of the young (MODY) is a monogenic form of Type II diabetes mellitus.
- Mutations in the hepatic nuclear factor 1-alpha (HNF-1alpha) gene are the most common cause of MODY.
Purpose of the Study:
- To elucidate the structural basis of HNF-1alpha dimerization.
- To understand how MODY-associated mutations affect HNF-1alpha structure and function.
Main Methods:
- Structural analysis of the HNF-1alpha dimerization motif.
- Investigating the interaction between HNF-1alpha and transcriptional coactivators.
Main Results:
- The dimerization motif of HNF-1alpha forms an intermolecular four-helix bundle with distinct structural features.
- This 'mini-zipper' structure exhibits complementarity to transcriptional coactivators.
- Specific MODY-associated mutations destabilize this four-helix bundle.
Conclusions:
- Impaired dimerization of HNF-1alpha due to specific mutations provides a molecular mechanism for metabolic deregulation in diabetes mellitus.
- Understanding HNF-1alpha structure-function relationships is crucial for diabetes research.