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Plant Physiol, December 1999, Vol. 121, pp. 1127-1141

Stop-and-Go Movements of Plant Golgi Stacks Are Mediated by the Acto-Myosin System1

Andreas Nebenführ,* Larry A. Gallagher, Terri G. Dunahay, Jennifer A. Frohlick, Anna M. Mazurkiewicz, Janet B. Meehl, and L. Andrew Staehelin

Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Colorado 80309-0347

The Golgi apparatus in plant cells consists of a large number of independent Golgi stack/trans-Golgi network/Golgi matrix units that appear to be randomly distributed throughout the cytoplasm. To study the dynamic behavior of these Golgi units in living plant cells, we have cloned a cDNA from soybean (Glycine max), GmMan1, encoding the resident Golgi protein alpha -1,2 mannosidase I. The predicted protein of approximately 65 kD shows similarity of general structure and sequence (45% identity) to class I animal and fungal alpha -1,2 mannosidases. Expression of a GmMan1::green fluorescent protein fusion construct in tobacco (Nicotiana tabacum) Bright Yellow 2 suspension-cultured cells revealed the presence of several hundred to thousands of fluorescent spots. Immuno-electron microscopy demonstrates that these spots correspond to individual Golgi stacks and that the fusion protein is largely confined to the cis-side of the stacks. In living cells, the stacks carry out stop-and-go movements, oscillating rapidly between directed movement and random "wiggling." Directed movement (maximal velocity 4.2 µm/s) is related to cytoplasmic streaming, occurs along straight trajectories, and is dependent upon intact actin microfilaments and myosin motors, since treatment with cytochalasin D or butanedione monoxime blocks the streaming motion. In contrast, microtubule-disrupting drugs appear to have a small but reproducible stimulatory effect on streaming behavior. We present a model that postulates that the stop-and-go motion of Golgi-trans-Golgi network units is regulated by "stop signals" produced by endoplasmic reticulum export sites and locally expanding cell wall domains to optimize endoplasmic reticulum to Golgi and Golgi to cell wall trafficking.

1 This work was supported by the National Institutes of Health (grant no. GM18639) to L.A.S.

* Corresponding author; e-mail andreas.nebenfuehr{at}colorado.edu; fax 303-492-7744.

© 1999 American Society of Plant Physiologists


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