Tubulin binding protein, CacyBP/SIP, induces actin polymerization and may link actin and tubulin cytoskeletons

Biochimica Et Biophysica Acta
Gabriela SchneiderAnna Filipek

Abstract

CacyBP/SIP, originally identified as a S100A6 target, was shown to interact with some other S100 proteins as well as with Siah-1, Skp1, tubulin and ERK1/2 kinases (reviewed in Schneider and Filipek, Amino Acids, 2010). Here, we show that CacyBP/SIP interacts and co-localizes with actin in NB2a cells. Using a zero-length cross-linker we found that both proteins bound directly to each other. Co-sedimentation assays revealed that CacyBP/SIP induced G-actin polymerization and formation of unique circular actin filament bundles. The N-terminal fragment of CacyBP/SIP (residues 1-179) had similar effect on actin polymerization as the entire CacyBP/SIP protein, while the C-terminal one (residues 178-229) had not. To check the influence of CacyBP/SIP on cell morphology as well as on cell adhesion and migration, a stable NIH 3T3 cell line with an increased level of CacyBP/SIP was generated. We found that the adhesion and migration rates of the modified cells were changed in comparison with the control ones. Interestingly, the co-sedimentation and proximity ligation assays indicated that CacyBP/SIP could simultaneously interact with tubulin and actin, suggesting that CacyBP/SIP might link actin and tubulin cytoskeletons.

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Citations

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