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Regular Article |
a Department of Biochemistry and Molecular Biology, University of Calgary, Calgary, Alberta, Canada T2N 4N1
ABSTRACT
Kinesins are tetrameric motor molecules, consisting of two kinesin heavy chains (KHCs) and two kinesin light chains (KLCs) that are involved in transport of cargo along microtubules. The function of the light chain may be in cargo binding and regulation of kinesin activity. In the mouse, two KLC genes, KLC1 and KLC2, had been identified. KLC1 plays a role in neuronal transport, and KLC2 appears to be more widely expressed. We report the cloning from a testicular cDNA expression library of a mammalian light chain, KLC3. The KLC3 gene is located in close proximity to the ERCC2 gene. KLC3 can be classified as a genuine light chain: it interacts in vitro with the KHC, the interaction is mediated by a conserved heptade repeat sequence, and it associates in vitro with microtubules. In mouse and rat testis, KLC3 protein expression is restricted to round and elongating spermatids, and KLC3 is present in sperm tails. In contrast, KLC1 and KLC2 can only be detected before meiosis in testis. Interestingly, the expression profiles of the three known KHCs and KLC3 differ significantly: Kif5a and Kif5b are not expressed after meiosis, and Kif5c is expressed at an extremely low level in spermatids but is not detectable in sperm tails. Our characterization of the KLC3 gene suggests that it carries out a unique and specialized role in spermatids.
First decision: 21 November 2000.
1 Supported by grants from the Medical Research Council of Canada to F.A.v.d.H. A.J. and B.B. were supported in part by studentships from the Alberta Cancer Foundation.
2 Correspondence: Frans A. van der Hoorn, Department of Biochemistry and Molecular Biology, University of Calgary, 3330 Hospital Drive N.W., Calgary, AB, Canada T2N 4N1. FAX: 403 283 8727; fvdhoorn{at}ucalgary.ca
3 These authors contributed equally to this work.
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