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Proc Natl Acad Sci U S A
1993 Mar 01;905:1671-5. doi: 10.1073/pnas.90.5.1671.
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Recombinant kinesin motor domain binds to beta-tubulin and decorates microtubules with a B surface lattice.
Song YH
,
Mandelkow E
.
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We have expressed the recombinant squid kinesin head domain in Escherichia coli and studied its interaction with microtubules. The head is active as a microtubule-stimulated ATPase and binds to microtubules, but it does not support microtubule gliding by itself. The head binds to both microtubules and depolymerized tubulin. In each case the zero-length crosslinker 1-ethyl-3-[3-dimethylamino)propyl] carbodiimide induces a bond specifically to beta- but not alpha-tubulin. The head decorates brain microtubules with an 8-nm axial spacing. Thus the stoichiometry is one kinesin head per tubulin dimer. The lattice is that of flagellar B-tubules, implying that reassembled microtubules are not symmetric. Moreover, the A- and B-tubules of intact flagellar outer doublets are both decorated with a B lattice. This suggests that the B lattice is a general property of microtubules.
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