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Genetically determined proteolytic cleavage modulates alpha7beta1 integrin function.

Jianming Liu1, Praveen B Gurpur, Stephen J Kaufman

  • 1Department of Cell and Developmental Biology, University of Illinois, Urbana, Illinois 61801, USA.

The Journal of Biological Chemistry
|October 23, 2008
PubMed
Summary
This summary is machine-generated.

Proteolytic cleavage of the alpha7 integrin chain enhances muscle cell adhesion and spreading. This cleavage, regulated by species-specific differences and myogenic differentiation, offers a novel mechanism for integrin function regulation.

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Area of Science:

  • Muscle biology
  • Cellular adhesion mechanisms
  • Integrin function

Background:

  • The dystrophin-glycoprotein complex and alpha7beta1 integrin link muscle fibers to the extracellular matrix.
  • Alpha7beta1 integrin is crucial for skeletal muscle, with variants arising from splicing and modifications.
  • Species-specific differences in alpha7 integrin chains due to proteolytic cleavage were observed.

Purpose of the Study:

  • Investigate a species-specific proteolytic cleavage site (603RRQ605) in the alpha7 integrin chain.
  • Determine the functional consequences of this cleavage on cell adhesion and spreading.
  • Explore the regulation and potential mediators of alpha7 integrin cleavage during muscle differentiation.

Main Methods:

  • Site-directed mutagenesis to prevent RRQ cleavage.
  • Protein structure modeling to locate the cleavage site.
  • Cell adhesion and spreading assays.
  • Analysis of cleavage during myogenic differentiation.

Main Results:

  • Mutagenesis of RRQ to GRQ abolished alpha7 integrin cleavage.
  • The cleaved alpha7 integrin form significantly enhanced cell adhesion and spreading on laminin.
  • Cleavage was elevated during myogenic differentiation, potentially mediated by urokinase-type plasminogen activator.
  • The RRQ cleavage site is conserved in vertebrates but absent in mice.

Conclusions:

  • Proteolytic cleavage is a novel regulatory mechanism for alpha7 integrin function in skeletal muscle.
  • This cleavage enhances muscle cell adhesion and spreading on laminin.
  • Evolutionary modification of cleavage sites expands protein functions, impacting muscle physiology.