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A correction to this article has been published: J. Cell Biol. 150 (6) 1517
Published online 21 August 2000. doi:10.1083/jcb.150.4.823
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© The Rockefeller University Press, 0021-9525/2000//823 $5.00
The Journal of Cell Biology, Volume 150, Number 4, , 2000 823-838

Original Article

Dynacortin, a Genetic Link between Equatorial Contractility and Global Shape Control Discovered by Library Complementation of a Dictyostelium discoideum Cytokinesis Mutant



Douglas N. Robinsona and James A. Spudicha

a Department of Biochemistry and Developmental Biology, Beckman Center, Stanford University, Stanford, California 94305-5307
Department of Biochemistry and Developmental Biology, Beckman Center, Rm. B-400, Stanford University, Stanford, CA 94305-5307.650-725-6044650-725-6376

drobinso{at}cmgm.stanford.edu

We have developed a system for performing interaction genetics in Dictyostelium discoideum that uses a cDNA library complementation/multicopy suppression strategy. Chemically mutagenized cells were screened for cytokinesis-deficient mutants and one mutant was subjected to library complementation. Isolates of four different genes were recovered as modifiers of this strain's cytokinesis defect. These include the cleavage furrow protein cortexillin I, a novel protein we named dynacortin, an ezrin-radixin-moesin-family protein, and coronin. The cortexillin I locus and transcript were found to be disrupted in the strain, identifying it as the affected gene. Dynacortin is localized partly to the cell cortex and becomes enriched in protrusive regions, a localization pattern that is similar to coronin and partly dependent on RacE. During cytokinesis, dynacortin is found in the cortex and is somewhat enriched at the poles. Furthermore, it appears to be reduced in the cleavage furrow. The genetic interactions and the cellular distributions of the proteins suggest a hypothesis for cytokinesis in which the contraction of the medial ring is a function of spatially restricted cortexillin I and myosin II and globally distributed dynacortin, coronin, and RacE.

Key Words: cytoskeleton • cortexillin • cell cortex • cell protrusion • Rac small GTPase

© 2000 The Rockefeller University Press

Abbreviations used in this paper: myo II, myosin II; myo II–, myo II null cell line; NQNO, 4-nitroquinolone-N-oxide; NaVi, sodium vanadate (Na2HVO4); ORF, open reading frame.


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