Referenced in: none

Automatically associated channels: Kir2.3

Title: The 93-kDa glycine receptor-associated protein binds to tubulin.

Authors: J Kirsch, D Langosch, P Prior, U Z Littauer, B Schmitt, H Betz

Journal, date & volume: J. Biol. Chem., 1991 Nov 25 , 266, 22242-5

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/1657993

Abstract
A peripheral membrane protein with a relative molecular mass of 93,000 Da is associated with cytoplasmic domains of the inhibitory glycine receptor of mammalian spinal cord. Here, evidence is given that this 93-kDa protein binds to polymerized tubulin. First, tubulin cofractionated with the 93-kDa protein upon affinity purification of the glycine receptor. Second, tubulin bound to the isolated 93-kDa protein in an overlay procedure. Third, in assays containing the purified glycine receptor, the 93-kDa protein as well as the glycine receptor alpha and beta subunits coassembled with tubulin and microtubules. The interaction of the 93-kDa protein with tubulin displayed high affinity (KD approximately 2.5 nM) and significant cooperativity (Hill coefficient approximately 2.1) and approached a stoichiometry of approximately 1:4 under saturating conditions. These data suggest that the 93-kDa protein anchors the glycine receptor at postsynaptic sites via binding to subsynaptic tubulin.