Several extracellular domains of the neural cell adhesion molecule L1 are involved in homophilic interactions.

Abstract:

:The neural cell adhesion molecule L1 is a multidomain protein that plays important roles in cell adhesion, migration, and neurite outgrowth. It can interact with itself by a self-binding, i.e., homophilic adhesion mechanism (Kadmon et al.: J Cell Biol 110: 193-208, 1990a). To determine the domains of L1 involved in homophilic binding, we have generated protein fragments of L1 in a prokaryotic and a eukaryotic expression system and used these covalently coupled to fluorescent microspheres to quantify aggregation between them by cytofluorometric analysis. Protein fragments containing the first and second Ig-like domains and the third fibronectin type III homologous repeat showed avid self-binding. Ig-like domains III and IV also showed some self-binding, whereas Ig-like domains V and VI and fibronectin type III homologous repeats 1 and 2 as well as 4 and 5 were less or not active. Binding between different domains was also observed: fibronectin type III homologous repeats 4 and 5 interacted with Ig-like domains I and II, and fibronectin type III homologous repeats 3-5 interacted with all Ig-like domains. These results were confirmed by experiments testing the binding of fragment-conjugated microspheres to substrate-coated L1 or to cell surface-expressed L1 on cultured neurons. Binding of L1 to itself was interfered with by all protein fragments tested, suggesting that also less avidly binding domains of L1 contribute to homophilic binding. These observations indicate prominent functional roles of both Ig-like domains and fibronectin type III homologous repeats in homophilic binding of L1.

journal_name

J Neurosci Res

authors

Holm J,Appel F,Schachner M

doi

10.1002/jnr.490420103

subject

Has Abstract

pub_date

1995-09-01 00:00:00

pages

9-20

issue

1

eissn

0360-4012

issn

1097-4547

journal_volume

42

pub_type

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