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Matthew Tyska
Faculty Member
Last active: 4/10/2018

MYO1A (brush border myosin I) dynamics in the brush border of LLC-PK1-CL4 cells.

Tyska MJ, Mooseker MS
Biophys J. 2002 82 (4): 1869-83

PMID: 11916846 · PMCID: PMC1301984 · DOI:10.1016/S0006-3495(02)75537-9

The kidney epithelial cell line, LLC-PK1-CL4 (CL4), forms a well ordered brush border (BB) on its apical surface. CL4 cells were used to examine the dynamics of MYO1A (M1A; formerly BB myosin I) within the BB using GFP-tagged MIA (GFP-M1A), MIA motor domain (GFP-MDIQ), and tail domain (GFP-Tail). GFP-beta-actin (GFP-Actin) was used to assess actin dynamics within the BB. GFP-M1A, GFP-Tail, but not GFP-MDIQ localized to the BB, indicating that the tail is sufficient for apical targeting of M1A. GFP-Actin targeted to all the actin domains of the cell including the BB. Fluorescence recovery after photobleaching analysis revealed that GFP-M1A and GFP-Tail turnover in the BB is rapid, approximately 80% complete in <1 min. As expected for an actin-based motor, ATP depletion resulted in significant inhibition of GFP-M1A turnover yet had little effect on GFP-Tail exchange. Rapid turnover of GFP-M1A and GFP-Tail was not due to actin turnover as GFP-Actin turnover in the BB was much slower. These results indicate that the BB population of M1A turns over rapidly, while its head and tail domains interact transiently with the core actin and plasma membrane, respectively. This rapidly exchanging pool of M1A envelops an actin core bundle that, by comparison, is static in structure.

MeSH Terms (24)

Actins Animals Biophysical Phenomena Biophysics Cloning, Molecular Cytoskeleton Electrophoresis, Polyacrylamide Gel Green Fluorescent Proteins Humans Kidney Kinetics LLC-PK1 Cells Luminescent Proteins Microscopy, Confocal Microscopy, Fluorescence Microvilli Myosin Type I Precipitin Tests Protein Structure, Tertiary Recombinant Fusion Proteins Subcellular Fractions Swine Time Factors Transfection

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