1. The N-terminal region of the human autophagy protein ATG16L1 contains a domain that folds into a helical structure consistent with formation of a coiled-coil
- Author
-
Parkhouse, Rhiannon, Ebong, Ima-Obong, Robinson, Carol V., and Monie, Tom P.
- Subjects
Models, Molecular ,Protein Folding ,Molecular Sequence Data ,Autophagy-Related Proteins ,lcsh:Medicine ,Mass Spectrometry ,Phagosomes ,Autophagy ,Humans ,Amino Acid Sequence ,lcsh:Science ,Conserved Sequence ,Base Sequence ,Circular Dichroism ,lcsh:R ,Computational Biology ,Sequence Analysis, DNA ,Protein Structure, Tertiary ,Gene Components ,Multiprotein Complexes ,Chromatography, Gel ,Electrophoresis, Polyacrylamide Gel ,lcsh:Q ,Carrier Proteins ,Sequence Alignment ,Ultracentrifugation ,Research Article - Abstract
Autophagy is a fundamental cellular process required for organelle degradation and removal of invasive pathogens. Autophagosome formation involves the recruitment of, and interaction between, multiple proteins produced from autophagy-related (ATG) genes. One of the key complexes in autophagosome formation is the ATG12-ATG5-ATG16L1 complex. ATG16L1 functions as a molecular scaffold mediating protein-protein interactions necessary for formation of the autophagosome in response to both classical and pathogen-related autophagy stimuli. The coiled-coil domain of the yeast ortholog, ATG16, exists as a homodimer both in solution and in the crystal form. The yeast and human orthologs show poor sequence identity. Here we have sought to determine the minimal boundaries of the human ATG16L1 coiled-coil domain and ascertain its oligomeric status in solution. Using a range of biochemical and biophysical techniques we show that the secondary structure of the human ATG16L1 coiled-coil has the expected helical composition and that the domain forms a homodimer in solution. We also observe extensive sequence conservation across vertebrates providing strong support for the crucial functional role of the ATG16L1 coiled-coil.
- Published
- 2013