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H-, N-, and K-Ras are isoforms of Ras proteins, which undergo different lipid modifications at the C terminus. These post-translational events make possible the association of Ras proteins both with the inner plasma membrane and to the cytosolic surface of endoplasmic reticulum and Golgi complex, which is also required for the proper function of these(More)
The biological impact of Rho depends critically on the precise subcellular localization of its active, GTP-loaded form. This can potentially be determined by the balance between molecules that promote nucleotide exchange or GTP hydrolysis. However, how these activities may be coordinated is poorly understood. We now report a molecular pathway that achieves(More)
The pathogenesis of gastroparesis is complicated and poorly understood. This lack of understanding remains a major impediment to the development of effective therapies for this condition. Most of the scientific information available on the pathogenesis of gastroparesis has been derived from experimental studies of diabetes in animals. These studies suggest(More)
Although human papillomavirus (HPV) infection is the main causal factor for cervical cancer (CC), there are data suggesting that genetic factors could modulate the risk for CC. Sibling studies suggest that maternally inherited factors could be involved in CC. To assess whether mitochondrial DNA (mtDNA) polymorphisms are associated to CC, HPV infection and(More)
Cadherin junctions arise from the integrated action of cell adhesion, signaling, and the cytoskeleton. At the zonula adherens (ZA), a WAVE2-Arp2/3 actin nucleation apparatus is necessary for junctional tension and integrity. But how this is coordinated with cadherin adhesion is not known. We now identify cortactin as a key scaffold for actin regulation at(More)
An acylation/deacylation cycle is necessary to maintain the steady-state subcellular distribution and biological activity of S-acylated peripheral proteins. Despite the progress that has been made in identifying and characterizing palmitoyltransferases (PATs), much less is known about the thioesterases involved in protein deacylation. In this work, we(More)
E-cadherin cell-cell junctions couple the contractile cortices of epithelial cells together, generating tension within junctions that influences tissue organization. Although junctional tension is commonly studied at the apical zonula adherens, we now report that E-cadherin adhesions induce the contractile actomyosin cortex throughout the apical-lateral(More)
The functional link between glycolipid glycosyltransferases (GT) relies on the ability of these proteins to form organized molecular complexes. The organization, stoichiometry and composition of these complexes may impact their sorting properties, sub-Golgi localization, and may determine relative efficiency of GT in different glycolipid biosynthetic(More)
We use a two-dimensional cellular Potts model to represent the behavior of an epithelial cell layer and describe its dynamics in response to a microscopic wound. Using an energy function to describe properties of the cells, we found that the interaction between contractile tension along cell-cell junctions and cell-cell adhesion plays an important role not(More)