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Interaction of myocilin with the C-terminal region of hevin

, : Interaction of myocilin with the C-terminal region of hevin. Biochemical and Biophysical Research Communications 339(3): 797-804

Myocilin, a matricellular protein, is mutated in glaucoma. Here we report the identification and characterization, by the yeast two-hybrid system, of a putative interacting protein with myocilin. One of the positive clones exhibited 100% identity with the carboxyl-terminal (C-t) region of hevin, a member of the BM-40/SPARC/osteonectin family of extracellular matrix proteins. Protein interaction was assayed, in doubly transfected 293-T cells, by Western blot and fluorescent microscopy. Western blot analysis of the culture medium and lysates from cotransfected cells indicated that myocilin causes intracellular accumulation of hevin-C-t and impairs its secretion. This effect on hevin-C-t was augmented when coexpressed with the myocilin P370L mutant, known to cause a severe form of glaucoma. By fluorescent microscopy, myocilin localizes with hevin-C-t in the Golgi in cotransfected 293-T cells and with hevin-wt in the ocular ciliary epithelium. Overall, these results suggested that the C-t of hevin contains important determinants for interaction with myocilin. (c) 2005 Elsevier Inc. All rights reserved.


PMID: 16316624

DOI: 10.1016/j.bbrc.2005.11.082

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