CREM-dependent transcription in male germ cells controlled by a kinesin

Betina Macho, Stefano Brancorsini, Gian Maria Fimia, Mitsutoshi Setou, Nobutaka Hirokawa, Paolo Sassone-Corsi

Research output: Contribution to journalArticlepeer-review


ACT is a LIM-only protein expressed exclusively in round spermatids, where it cooperates with transcriptional activator CREM in regulating various postmeiotic genes. Targeted inactivation of CREM leads to a complete block of mouse spermiogenesis. We sought to identify the regulatory steps controlling the functional interplay between CREM and ACT. We found that ACT selectively associates with KIF17b, a kinesin highly expressed in male germ cells. The ACT-KIF17b interaction is restricted to specific stages of spermatogenesis and directly determines the intracellular localization of ACT. Sensitivity to leptomycin B indicates that KIF17b can be actively exported from the nucleus through the Crml receptor. Thus, a kinesin directly controls the activity of a transcriptional coactivator by a tight regulation of its intracellular localization.

Original languageEnglish
Pages (from-to)2388-2390
Number of pages3
Issue number5602
Publication statusPublished - Dec 20 2002

ASJC Scopus subject areas

  • General


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