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- W2004747664 abstract "ROS-GC represents a membrane guanylate cyclase subfamily whose distinctive feature is that it transduces diverse intracellularly generated Ca(2+) signals into the production of the second messenger cyclic GMP. An intriguing feature of the first subfamily member, ROS-GC1, is that it is both stimulated and inhibited by these signals. The inhibitory signals are processed by the cyclase activating proteins, GCAPs. The only known stimulatory signal is by the Ca(2+)-dependent guanylate cyclase activating protein, CD-GCAP. There are two GCAPs, 1 and 2, which link the cyclase with phototransduction, and one CD-GCAP, which is predicted to link ROS-GC1 with its retinal synaptic activity. Individual switches for these GCAPs and CD-GCAP have been respectively defined as CRM1, CRM3, and CRM2. This report defines the identity of a new ROS-GC1 regulator: neurocalcin. A surprising feature of the regulator is that it structurally is a GCAP but functionally behaves as a CD-GCAP. Recombinant neurocalcin stimulates ROS-GC1 in a dose-dependent fashion; the stimulation is Ca(2+)-dependent with an EC(50) of 20 microM; and the modulated domain resides at the C-terminal segment, between amino acids 731 and 1054. Previously, the residence of CRM2 has also been defined in this segment of the cyclase. However, the present study shows that the neurocalcin-regulated domain is distinct from CRM2. This is now designated as CRM4. Thus, the signal transduction mechanisms of neurocalcin and CD-GCAP are different, occurring through different modules of ROS-GC1. Neurocalcin signaling of ROS-GC1 is highly specific. It does not influence the activity of its second subfamily member, ROS-GC2, and of the other retinal guanylate cyclase, atrial natriuretic factor-receptor guanylate cyclase. In conclusion, the findings extend the concept of ROS-GC1's sensing diverse Ca(2+) signals, reveal the identity of its unexpected new Ca(2+) regulator, and show that the regulator acts through its specific cyclase domain. This represents an additional transduction mechanism of Ca(2+) signaling via ROS-GC1." @default.
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- W2004747664 date "1999-09-01" @default.
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- W2004747664 title "A Second Calcium Regulator of Rod Outer Segment Membrane Guanylate Cyclase, ROS-GC1: Neurocalcin" @default.
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- W2004747664 doi "https://doi.org/10.1021/bi990851n" @default.
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