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Structural features of the terminal loop region of frog retinal rod outer segment disk membranes: II. Organization of the terminal loop complex


Structural features of the terminal loop region of frog retinal rod outer segment disk membranes: II. Organization of the terminal loop complex



Journal of Comparative Neurology 257(1): 9-23



ISSN/ISBN: 0021-9967

PMID: 2437163

DOI: 10.1002/cne.902570103

In addition to a lipid bilayer component (Corless, Fetter, and Costello: J. Comp. Neurol. 257:1-8, '87), the terminal loop region of frog rod outer segment (ROS) disks displays a clustering of discrete elements referred to as the terminal loop complex. It consists of (1) semicircular or crescentic densities within the terminal loop, (2) linear interdisk densities spanning the cytoplasm near terminal loops, and (3) distinctive freeze-fracture particles associated with the terminal loop, located between 1 and 2. The linear interdisk densities are organized on a two-dimensional lattice that appears to ensheath completely the lamellar domains of all ROS disks. Indirect evidence is presented for a net axial alignment of intraloop densities. We interpret the large freeze-fracture particles of the terminal loop region to reflect transmembrane components that connect the interdisk and intraloop densities. Thus, we propose that the entire terminal loop (TL) complex is organized on a two-dimensional net. We further infer that each TL complex is organized as a dimeric unit and that such dimers interact axially and laterally to generate the observed lattice structure. It is suggested that one component of the terminal loop complex is the high molecular weight protein localized along the disk perimeter by Papermaster, Schneider, Zorn, and Kraehenbuhl (J. Cell. Biol. 78:415-425, '78).

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Accession: 006491181

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Related references

Structural features of the terminal loop region of frog retinal rod outer segment disk membranes. I: Organization of the terminal loop complex. Journal of Comparative Neurology (1911) 257(1): 9-23, 1987

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