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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

The forkhead-associated domain of Ki-67 antigen interacts with the novel kinesin-like protein Hklp2.

The Ki-67 antigen (pKi-67) is widely used as a cell proliferation marker protein. Its actual role in the cell cycle progression, however, is presently unclear. Using a two-hybrid screening in yeast, a novel protein, termed Hklp2 (human kinesin-like protein 2), was identified and shown to interact with the forkhead-associated (FHA) domain of pKi-67. Hklp2 has 1388 amino acids and shows a striking similarity (a 53% identity in amino acids) to Xklp2, a plus-end directed kinesin-like motor found in Xenopus. The interaction domain of Hklp2 was mapped to the portion that comprised residues 1017-1237 and that was phosphorylated in vitro by incubating with mitotic but not interphasic HeLa cell extracts. That the interaction was striking in the mitotic extract was also verified. In addition, immunofluorescence using specific antibodies revealed an association between pKi-67 and Hklp2 at the periphery of mitotic chromosomes, largely in close proximity to the centromeres. These findings suggest that pKi-67 is involved in the progression of mitosis via its interaction with Hklp2.[1]

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