Novel role of the muskelin-RanBP9 complex as a nucleocytoplasmic mediator of cell morphology regulation.

The Journal of Cell Biology
Manojkumar ValiyaveettilJosephine C Adams

Abstract

The evolutionarily conserved kelch-repeat protein muskelin was identified as an intracellular mediator of cell spreading. We discovered that its morphological activity is controlled by association with RanBP9/RanBPM, a protein involved in transmembrane signaling and a conserved intracellular protein complex. By subcellular fractionation, endogenous muskelin is present in both the nucleus and the cytosol. Muskelin subcellular localization is coregulated by its C terminus, which provides a cytoplasmic restraint and also controls the interaction of muskelin with RanBP9, and its atypical lissencephaly-1 homology motif, which has a nuclear localization activity which is regulated by the status of the C terminus. Transient or stable short interfering RNA-based knockdown of muskelin resulted in protrusive cell morphologies with enlarged cell perimeters. Morphology was specifically restored by complementary DNAs encoding forms of muskelin with full activity of the C terminus for cytoplasmic localization and RanBP9 binding. Knockdown of RanBP9 resulted in equivalent morphological alterations. These novel findings identify a role for muskelin-RanBP9 complex in pathways that integrate cell morphology regulation and nucleocytoplasmic commu...Continue Reading

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Methods Mentioned

BETA
two-hybrid
confocal microscopy
coimmunoprecipitation
immunoprecipitation
protein folding
transfection
FCS
PCR
restriction digest

Software Mentioned

Scansite
Openlab
BLASTP
WebLogo
Image J
Improvision
BLAST
Prosite
Leica

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