[No authors listed]
This study documents the detailed biochemical, structural, and functional identity of a novel Ca(2+)-modulated membrane guanylate cyclase transduction system in the inner retinal neurons. The guanylate cyclase is the previously characterized from the photoreceptor outer segments and its new modulator is neurocalcin delta. At the membrane, the myristoylated form of neurocalcin delta senses submicromolar increments in free Ca(2+), binds to its specific duanyu1670-GC1 domain, and stimulates the cyclase. Neurocalcin delta is not present in indicating the absence of the pathway in the outer segments and the dissociation of its linkage with phototransduction. Thus, the pathway is linked specifically with the visual transduction machinery in the secondary neurons of the retina. With the inclusion of this pathway, the findings broaden the understanding of the existing mechanisms showing how duanyu1670-GC1 is able to receive and transduce diverse Ca(2+) signals into the cell-specific generation of second-messenger cyclic GMP in the retinal neurons.
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