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Calmodulin-binding proteins in teleost retina, rod inner and outer segments, and rod cytoskeletons.

125I-calmodulin gel overlay techniques have been used to identify calmodulin-binding proteins in teleost retina, in a rod fragment preparation which contains rod inner and outer segments (RIS-ROS), and in RIS-ROS cytoskeletons. We have previously shown that teleost rods change length in response to changes in light conditions, that rod movement is mediated by the actin filaments in the rod inner segment, and that both Ca2+ and cAMP appear to be involved in regulating rod movement. We report here the development of a rod fragment preparation (RIS-ROS), which retains the movable part of the rod, for use in biochemical analysis of rod motility. Gel overlay studies indicate that isolated whole retinas have six prominent calmodulin-binding proteins, migrating at 240 K, 190 K, 150 K, 61 K and a doublet at 18/19 K. In contrast, detached RIS-ROS have three different prominent calmodulin-binding proteins, migrating at 330 K, 33 K, and 31 K. RIS-ROS cytoskeletons have been produced by extraction with Triton X-100; they contain both actin filament bundles and microtubules associated with the connecting cilium. RIS-ROS cytoskeletons have 3 prominent calmodulin-binding proteins migrating at 240 and 18/19 K. These proteins produce faint bands in gel overlays of intact RIS-ROS, but prominent bands in overlays of whole retina. The 240 K protein of RIS-ROS cytoskeletons co-migrates with the 240 K calmodulin-binding subunit of rat brain fodrin. We suggest that the rod 240 K calmodulin-binding protein may be a spectrin-like protein which participates in Ca2+- and calmodulin-regulation of rod motility.