A Possible Role for Ligatin and the Phosphoglycoproteins It Binds in Calcium‐Dependent Retinal Cell Adhesion

Academic Article

Abstract

  • Ligatin is a filamentous plasma membrane protein that serves as a baseplate for the attachment of peripheral glycoproteins to the external cell surface. Ligatin can be released from intact, embryonic chick neural retinal cells by treatment with 20 mM Ca++ without adversely affecting their viability. α‐Glucose‐1‐phos phate is also effective in removing ligatin‐associated glycoproteins from intact cells. After either of these treatments, the retinal cells seem not to exhibit Ca++ ‐dependent adhesion for one another. It is thus suggested that ligatin in neural retina may serve as a baseplate for the attachment to the cell surface of glycoproteins active in Ca++‐dependent adhesion. The finding that Ca++ serves to protect Ca++‐dependent adhesion molecules from digestion by trypsin is discussed in relation to steric constraints on trypsin's accessibility to these adhesion molecules because of their possible binding to arrayed ligatin filaments. Copyright © 1982 Alan R. Liss, Inc.
  • Published In

    Digital Object Identifier (doi)

    Author List

  • Marchase RB; Koro LA; Kelly CM; McClay DR
  • Start Page

  • 461
  • End Page

  • 468
  • Volume

  • 18
  • Issue

  • 4