bioRxiv Biochemistry
bioRxiv Biochemistry
5 years ago

Structure and misfolding of the flexible tripartite coiled coil domain of glaucoma-associated myocilin

S. E., J. C., Hill, Lieberman, R. K., R. L., A., Hazel, E., Gumbart, Donegan, Nguyen
Glaucoma-associated myocilin is a member of the olfactomedins, a protein family broadly involved in neuronal development and human disease. Molecular studies of the myocilin N-terminal coiled coil demonstrate a unique tripartite architecture: a disulfide-linked, parallel dimer-of-dimers Y-shaped molecule, with distinct tetramer and dimer regions. The structure of the C-terminal 7-heptad dimer elucidates an unexpected repeat pattern involving electrostatic inter-strand stabilization. Molecular dynamics simulations reveal an alternate conformation in which the terminal inter-strand disulfide bond limits the extent of unfolding and results in a kinked configuration. Taken together, full-length myocilin is also branched, with two pairs of C- terminal olfactomedin domains. Selected variants within the N-terminal region alter the apparent quaternary structure of myocilin but do so without compromising stability or causing aggregation. In addition to increasing our structural knowledge of extracellular coiled coils for protein design and biomedically important olfactomedins, this work broadens the scope of protein misfolding in the pathogenesis of myocilin-associated glaucoma.

Publisher URL: http://biorxiv.org/cgi/content/short/154112v1

DOI: 10.1101/154112

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