title: Molecular motor KIF1C is not essential for mouse survival and motor-dependent retrograde Golgi apparatus-to-endoplasmic reticulum transport.
abstract: KIF1C is a new member of the kinesin superfamily of proteins (KIFs), which act as microtubule-based molecular motors involved in intracellular transport. We cloned full-length mouse kif1C cDNA, which turned out to have a high homology to a mitochondrial motor KIF1Balpha and to be expressed ubiquitously. To investigate the in vivo significance of KIF1C, we generated kif1C(-/-) mice by knocking in the beta-galactosidase gene into the motor domain of kif1C gene. On staining of LacZ, we detected its expression in the heart, liver, hippocampus, and cerebellum. Unexpectedly, kif1C(-/-) mice were viable and showed no obvious abnormalities. Because immunocytochemistry showed partial colocalization of KIF1C with the Golgi marker protein, we compared the organelle distribution in primary lung fibroblasts from kif1C(+/+) and kif1C(-/-) mice. We found that there was no significant difference in the distribution of the Golgi apparatus or in the transport from the Golgi apparatus to the endoplasmic reticulum (ER) facilitated by brefeldin A between the two cells. This retrograde membrane transport was further confirmed to be normal by time-lapse analysis. Consequently, KIF1C is dispensable for the motor-dependent retrograde transport from the Golgi apparatus to the ER.
authors.affiliation: Department of Cell Biology and Anatomy, Graduate School of Medicine, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Nakajima
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Takei
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Terunaga
authors.initials: T
authors.lastname: Nakagawa
authors.forename: Takao
authors.initials: T
authors.lastname: Nakata
authors.forename: Yasuko
authors.initials: Y
authors.lastname: Noda
authors.forename: Mitsutoshi
authors.initials: M
authors.lastname: Setou
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Hirokawa
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001693:Biological Transport, Active; D001921:Brain / Q000378:metabolism; D002478:Cells, Cultured; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D004721:Endoplasmic Reticulum / Q000502:physiology*; D018390:Gene Targeting; D006056:Golgi Apparatus / Q000502:physiology*; D016547:Kinesins / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D051379:Mice; D018345:Mice, Knockout; D020409:Molecular Motor Proteins / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D008969:Molecular Sequence Data; D017386:Sequence Homology, Amino Acid
chemical_list: D018076:DNA, Complementary; C485246:Kif1c protein, mouse; D020409:Molecular Motor Proteins; D016547:Kinesins