Isolated nucleic acid encoding retinol dehydrogenase

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/53 (2006.01) C07K 16/40 (2006.01) C12N 5/12 (2006.01) C12N 9/04 (2006.01) C12Q 1/68 (2006.01) G01N 33/566 (2006.01) G01N 33/573 (2006.01)

Patent

CA 2192334

In accordance with this invention, an RPE cell membrane assoclated protein which has a molecular weight of about 32 kd, as determined by SDS-PAGE, has now heen discovered. This protein, referred to an "?p32", forms an oligomeric protein complex with the previously characterized p63 protehn, a component of the membrane receptor for RBP. A nucleic acid molecule which codes for the p32 protein has also been isolated and sequence analysis shows that the p32 protehn belongs to the famiiy of short chain alcohol dehydrogenases, and exhibits 11-cis retinol dehydrogenase activity, the enzyme which catalyzes conversion of 11-cis-retinol into 11-cis retinaldehyde.

Selon cette invention, on a découvert une protéine associée à la membrane cellulaire de l'épithélium pigmentaire de la rétine qui a une masse moléculaire d'environ 32kd, telle que déterminée par l'électrophorèse sur gel de SDS. Cette protéine, désignée par "p32", forme un complexe protéinique oligomère avec la protéine p63 antérieurement caractérisée, un composant du récepteur membranaire de la protéine fixant le rétinol (PFR). Une molécule d'acide nucléique qui code pour la protéine p32 a été également isolée et l'analyse de la séquence indique que la protéine p32 appartient à la famille des alcool-déshydrogénases à chaîne courte, et présente l'activité de la déshydrogénase 11-cis rétinol, l'enzyme qui catalyse la conversion de 11-cis-rétinol en 11-cis rétinaldéhyde.

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