2g98

From Proteopedia

human gamma-D-crystallin

Overview

We describe a 5-year-old boy with a unique congenital cataract caused by, deposition of numerous birefringent, pleiochroic and macroscopically, prismatic crystals. Crystal analysis with subsequent automatic Edman, degradation and matrix-associated laser desorption ionization, time-of-flight mass spectrometry have identified the crystal-forming, protein as gammaD-crystallin (CRYGD) lacking the N-terminal methionine., Sequencing of the CRYGD gene has shown a heterozygous C-->A transversion, in position 109 of the inferred cDNA (36R-->S transversion of the, processed, N-terminal methionine-lacking CRYGD). The lens protein crystals, were X-ray diffracting, and our crystal structure solution at 2.25 A, suggests that mutant R36S CRYGD has an unaltered protein fold. In, contrast, the observed crystal packing is possible only with the mutant, protein molecules that lack the bulky Arg36 side chain. This is the first, described case of human cataract caused by crystallization of a protein in, the lens. It involves the third known mutation in the CRYGD gene but, offers, for the first time, a causative explanation of the phenotype.

Disease

Known diseases associated with this structure: Cataract, congenital, cerulean type, 3 OMIM:[123690], Cataract, crystalline aculeiform OMIM:[123690], Cataract, nonnuclear polymorphic congenital OMIM:[123690], Cataracts, punctate, progressive juvenile-onset OMIM:[123690]

About this Structure

2G98 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Link between a novel human gammaD-crystallin allele and a unique cataract phenotype explained by protein crystallography., Kmoch S, Brynda J, Asfaw B, Bezouska K, Novak P, Rezacova P, Ondrova L, Filipec M, Sedlacek J, Elleder M, Hum Mol Genet. 2000 Jul 22;9(12):1779-86. PMID:10915766

Page seeded by OCA on Mon Nov 12 22:16:17 2007