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Science 19 March 2004:
Vol. 303. no. 5665, p. 1725
DOI: 10.1126/science.303.5665.1725k
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A variety of physiological processes--from cell motility to the partitioning of chromosomes during cell division--have been explained by the presumed existence of gradients of functionally active proteins. Niethammer et al. (p. 1862) have now observed the existence of steady-state phosphorylation gradients of the tubulin-binding protein stathmin. These gradients were present in the lamellipodia of motile cells during interphase and around condensed chromosomes during mitosis. In both of these cases, the gradients are likely to be the result of localized kinase and diffusible phosphatase activities and will contribute to the production of polarized microtubule structures.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)