Actin: A Dynamic Framework for Multiple Plant Cell Functions by Richard B. Meagher, Elizabeth C. McKinney (auth.), C. J.

By Richard B. Meagher, Elizabeth C. McKinney (auth.), C. J. Staiger, F. Baluška, D. Volkmann, P. W. Barlow (eds.)

Actin is a really considerable protein that includes a dynamic polymeric community found in all eukaryotic cells, often called the actin cytoskeleton. The constitution and serve as of the actin cytoskeleton, that's modulated by means of a plethora of actin-binding proteins, plays a various diversity of mobile roles. Well-documented features for actin comprise: supplying the molecular tracks for cytoplasmic streaming and organelle activities; formation of tethers that advisor the phone plate to the department website in the course of cytokinesis; construction of honeycomb-like arrays that enmesh and immobilize plastids in special subcellular styles; aiding the vesicle site visitors and cytoplasmic association crucial for the directional secretory mechanism that underpins tip development of sure cells; and coordinating the flowery cytoplasmic responses to additional- and intracellular indications. the former twenty years have witnessed a major accumulation of knowledge on the subject of the mobile, biochemical, and molecular elements of these kind of primary mobile methods. This brought on the editors to place jointly a various number of issues, contributed by way of confirmed overseas specialists, concerning the plant actin cytoskeleton. as the actin cytoskeleton impinges on a mess of strategies severe for plant development and improvement, in addition to for responses to the surroundings, the ebook may be precious to any researcher, from the complex undergraduate to the senior investigator, who's attracted to those components of plant phone biology.

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Discovered originally by Carlsson et aI. (1977) as a polypeptide that copurified with actin from extracts of spleen, profilin has been found in organisms from all eukaryotic kingdoms. , 45 CJ. Staiger et al. ), Actin: A Dynamic Frameworkfor Multiple Plant Cell Functions. 45-65. © 2000 Kluwer Academi c Publishers. Gibbon and Staiger 46 1994). These interactions are proposed to link profilin to signal transduction cascades that result in the reorganization of the actin cytoskeleton. The complex effects of profilin on actin organization undoubtedly result from the diversity of potential interactions.

Genetics 142: 587-602 McGrath 1M, lancso MM and Pichersky E (1993) Duplicate sequences with a similarity to expressed genes in the genome of Arabidopsis thaliana . Theor Appl Genet 86: 880-888 McKinney EC, Ali N, Traut A, Feldmann KA, Belostotsky DA, McDowell lA and Meagher RB (1995) Sequence based identification ofT-DNA insertion mutations in Arabidopsis: Actin Mutants act2-l and act4-l . Plant 18: 613-622 McKinney EC and Meagher RB (1998) Members of the Arabidopsis actin gene family are widely dispersed in the genome.

This regulation and the observations that skeletal myosin coated beads (Sheetz & Spudich, 1983) and isolated organelles (Kohno & Shimmen, 1988) move along characean actin cables, suggest the involvement of a myosin in streaming. In Chara cells, cytoplasmic streaming occurs at rates of up to 60 urn S-l (about an order of magnitude faster than the speed of the fastest muscle) (Kachar & Reese, 1988). , 1995; Higashi-Fujime et aI, 1995), strongly suggesting that the isolated protein is the motor responsible for cytoplasmic streaming.

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