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A PH domain within OCRL bridges clathrin mediated membrane trafficking to phosphoinositide metabolismA PH domain within OCRL bridges clathrin mediated membrane trafficking to phosphoinositide metabolism
Structural highlights
Publication Abstract from PubMedOCRL, whose mutations are responsible for Lowe syndrome and Dent disease, and INPP5B are two similar proteins comprising a central inositol 5-phosphatase domain followed by an ASH and a RhoGAP-like domain. Their divergent NH2-terminal portions remain uncharacterized. We show that the NH2-terminal region of OCRL, but not of INPP5B, binds clathrin heavy chain. OCRL, which in contrast to INPP5B visits late stage endocytic clathrin-coated pits, was earlier shown to contain another binding site for clathrin in its COOH-terminal region. NMR structure determination further reveals that despite their primary sequence dissimilarity, the NH2-terminal portions of both OCRL and INPP5B contain a PH domain. The novel clathrin-binding site in OCRL maps to an unusual clathrin-box motif located in a loop of the PH domain, whose mutations reduce recruitment efficiency of OCRL to coated pits. These findings suggest an evolutionary pressure for a specialized function of OCRL in bridging phosphoinositide metabolism to clathrin-dependent membrane trafficking. A PH domain within OCRL bridges clathrin-mediated membrane trafficking to phosphoinositide metabolism.,Mao Y, Balkin DM, Zoncu R, Erdmann KS, Tomasini L, Hu F, Jin MM, Hodsdon ME, De Camilli P EMBO J. 2009 Jul 8;28(13):1831-42. Epub 2009 Jun 18. PMID:19536138[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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