Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 391, Issue 4, Pages 1757-1761Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2009.12.149
Keywords
RPE65; Visual cycle; Isomerohydrolase; Leber congenital amaurosis; Retinoids
Categories
Funding
- NIH [EY012231, EY019309, EY018659]
- National Center for Research Resources [P20RR024215]
- OCAST
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RPE65 is the isomerohydrolase essential for regeneration of 11-cis retinal, the chromophore of visual pigments. Here we compared the impacts of two mutations in RPE65, E417Q identified in patients with Leber congenital amaurosis (LCA), and E417D on isomerohydrolase activity. Although both mutations decreased the stability of RPE65 and altered its sub-cellular localization, E417Q abolished isomerohydrolase activity whereas the E417D mutant retained partial enzymatic activity suggesting that the negative charge of E417 is important for RPE65 catalytic activity. Loss of charge at this position may represent a mechanism by which the E417Q mutation causes blindness in LCA patients. (C) 2009 Elsevier Inc. All rights reserved.
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