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J Biol Chem, Vol. 273, Issue 31, 19639-19649, July 31, 1998

Localization of Tctex-1, a Cytoplasmic Dynein Light Chain, to the Golgi Apparatus and Evidence for Dynein Complex Heterogeneity

Andrew W. TaiDagger , Jen-Zen Chuang§, and Ching-Hwa SungDagger §

From the Departments of Dagger  Cell Biology and Anatomy and § Ophthalmology, Margaret M. Dyson Vision Research Institute, Cornell University Medical College, New York, New York 10021

To date, much attention has been focused on the heavy and intermediate chains of the multisubunit cytoplasmic dynein complex; however, little is known about the localization or function of dynein light chains. In this study, we find that Tctex-1, a light chain of cytoplasmic dynein, localizes predominantly to the Golgi apparatus in interphase fibroblasts. Immunofluorescent staining reveals striking juxtanuclear staining characteristic of the Golgi apparatus as well as nuclear envelope and punctate cytoplasmic staining that often decorates microtubules. Tctex-1 colocalization with Golgi compartment markers, its distribution upon treatment with various pharmacological agents, and the cofractionation of Tctex-1-associated membranes with Golgi membranes are all consistent with a Golgi localization. The distribution of Tctex-1 in interphase cells only partially overlaps with the dynein intermediate chain and p150Glued upon immunofluorescence, but most of Tctex-1 is redistributed onto mitotic spindles along with other dynein/dynactin subunits. Using sequential immunoprecipitations, we demonstrate that there is a subset of Tctex-1 not associated with the intermediate chain at steady state; the converse also appears to be true. Distinct populations of dynein complexes are likely to exist, and such diversity may occur in part at the level of their light chain compositions.

Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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