A Gly-Zipper Motif Mediates Homodimerization of the Transmembrane Domain of the Mitochondrial Kinase ADCK3
| Autor: | Alessandro Senes, Benjamin K. Mueller, Jonathan A. Stefely, Chin Huat Tan, Ambalika S. Khadria, David J. Pagliarini |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Models
Molecular Amino Acid Motifs Molecular Sequence Data Glycine Biochemistry Article Catalysis Cell Line Conserved sequence Mitochondrial Proteins Cell membrane Colloid and Surface Chemistry Protein structure Escherichia coli medicine Humans Glycophorin Amino Acid Sequence Lipid bilayer Peptide sequence Conserved Sequence biology Chemistry Cell Membrane General Chemistry Transmembrane protein Mitochondria Protein Structure Tertiary Transmembrane domain medicine.anatomical_structure Mutagenesis biology.protein Biophysics Protein Multimerization Hydrophobic and Hydrophilic Interactions |
| Zdroj: | Journal of the American Chemical Society |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | Interactions between α-helices within the hydrophobic environment of lipid bilayers are integral to the folding and function of transmembrane proteins; however, the major forces that mediate these interactions remain debated, and our ability to predict these interactions is still largely untested. We recently demonstrated that the frequent transmembrane association motif GASright, the GxxxG-containing fold of the glycophorin A dimer, is optimal for the formation of extended networks of Cα–H hydrogen bonds, supporting the hypothesis that these bonds are major contributors to association. We also found that optimization of Cα–H hydrogen bonding and interhelical packing is sufficient to computationally predict the structure of known GASright dimers at near atomic level. Here, we demonstrate that this computational method can be used to characterize the structure of a protein not previously known to dimerize, by predicting and validating the transmembrane dimer of ADCK3, a mitochondrial kinase. ADCK3 is involved in the biosynthesis of the redox active lipid, ubiquinone, and human ADCK3 mutations cause a cerebellar ataxia associated with ubiquinone deficiency, but the biochemical functions of ADCK3 remain largely undefined. Our experimental analyses show that the transmembrane helix of ADCK3 oligomerizes, with an interface based on an extended Gly-zipper motif, as predicted by our models. The data provide strong evidence for the hypothesis that optimization of Cα–H hydrogen bonding is an important factor in the association of transmembrane helices. This work also provides a structural foundation for investigating the role of transmembrane association in regulating the biological activity of ADCK3. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|