PMID- 10559254 OWN - NLM STAT- MEDLINE DCOM- 19991214 LR - 20210209 IS - 0021-9258 (Print) IS - 0021-9258 (Linking) VI - 274 IP - 47 DP - 1999 Nov 19 TI - The kinesin-like motor protein KIF1C occurs in intact cells as a dimer and associates with proteins of the 14-3-3 family. PG - 33654-60 AB - Proteins of the kinesin superfamily are regulated in their motor activity as well as in their ability to bind to their cargo by carboxyl-terminal associating proteins and phosphorylation. KIF1C, a recently identified member of the KIF1/Unc104 family, was shown to be involved in the retrograde vesicle transport from the Golgi-apparatus to the endoplasmic reticulum. In a yeast two-hybrid screen using the carboxyl-terminal 350 amino acids of KIF1C as a bait, we identified as binding proteins 14-3-3 beta, gamma, epsilon, and zeta. In addition, a clone encoding the carboxyl-terminal 290 amino acids of KIF1C was found, indicating a potential for KIF1C to dimerize. Subsequent transient overexpression experiments showed that KIF1C can dimerize efficiently. However, in untransfected cells, only a small portion of KIF1C was detected as a dimer. The association of 14-3-3 proteins with KIF1C could be confirmed in transient expression systems and in untransfected cells and was dependent on the phosphorylation of serine 1092 located in a consensus binding sequence for 14-3-3 ligands. Serine 1092 was a substrate for the protein kinase casein kinase II in vitro, and inhibition of casein kinase II in cells diminished the association of KIF1C with 14-3-3gamma. Our data thus suggest that KIF1C can form dimers and is associated with proteins of the 14-3-3 family. FAU - Dorner, C AU - Dorner C AD - Medical Clinic IV, University of Tubingen, Tubingen, 72076 Germany. FAU - Ullrich, A AU - Ullrich A FAU - Haring, H U AU - Haring HU FAU - Lammers, R AU - Lammers R LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - J Biol Chem JT - The Journal of biological chemistry JID - 2985121R RN - 0 (14-3-3 Proteins) RN - 0 (KIF1C protein, human) RN - 0 (Kif1c protein, mouse) RN - 0 (Proteins) RN - EC 1.14.16.2 (Tyrosine 3-Monooxygenase) RN - EC 2.7.11.1 (Casein Kinase II) RN - EC 2.7.11.1 (Protein-Serine-Threonine Kinases) RN - EC 3.6.4.4 (Kinesin) SB - IM MH - 14-3-3 Proteins MH - Animals MH - Binding Sites MH - Casein Kinase II MH - Cell Line MH - Dimerization MH - Humans MH - Kinesin/chemistry/*metabolism MH - Mice MH - Phosphorylation MH - Protein Binding MH - Protein-Serine-Threonine Kinases/metabolism MH - Proteins/*metabolism MH - Substrate Specificity MH - Two-Hybrid System Techniques MH - *Tyrosine 3-Monooxygenase EDAT- 1999/11/24 00:00 MHDA- 1999/11/24 00:01 CRDT- 1999/11/24 00:00 PHST- 1999/11/24 00:00 [pubmed] PHST- 1999/11/24 00:01 [medline] PHST- 1999/11/24 00:00 [entrez] AID - 10.1074/jbc.274.47.33654 [doi] AID - S0021-9258(17)46512-4 [pii] PST - ppublish SO - J Biol Chem. 1999 Nov 19;274(47):33654-60. doi: 10.1074/jbc.274.47.33654.