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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

cDNA sequence analysis of CP94: rat lens fiber cell beaded-filament structural protein shows homology to cytokeratins.

To study the molecular structure of the gene responsible for a lens fiber cell beaded-filament structural protein of 94kDa (CP94), we isolated its specific cDNA from a rat lens cDNA library by use of anti-mouse CP94 antiserum. The expressed fusion protein kept the epitopes specific against anti-chick CP97 as well as anti-mouse CP94 antibody, and the size was estimated as 190-200kDa, indicating that the cDNA insert of the clone seemed to encode a polypeptide with 80-90kDa in appearance. Northern analysis indicated that CP94 mRNA is expressed only in the lens, and not in the brain, skin, heart, kidney, lung, and liver, and the size was estimated to 2.1-2.3kb. In a lens of inherited microphthalmic mouse, Elo, a trace amount of mRNA with the size closely similar to that of rat mRNA was observed. The entire compiled sequence (1,873bp) showed an open reading frame covering the sequence of 533 amino acids totalling 58,857Da. No sequence homologous to the entire CP94 was found among the entries of any nucleotide and amino acid sequence databases; but with respect to a limited amino acid sequence of N-side region of CP94, a significant homology with cytokeratins was found.[1]

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