The regulatory light chain of nonmuscle myosin is encoded by spaghetti-squash, a gene required for cytokinesis in Drosophila.

Abstract:

:Two independent approaches to understanding the molecular mechanism of cytokinesis have converged on the gene spaghetti-squash (sqh). A genetic screen for mitotic mutants identified sqh1, a mutation that disrupts cytokinesis, which was then cloned by transposon tagging. Independently, the gene that encodes the regulatory light chain of the biochemically defined nonmuscle myosin (MRLC-C) was also cloned. We show here that sqh encodes MRLC-C and that in sqh1 mutants, the level of stable light chain transcript is greatly reduced. Reversion by transposon excision or transformation with a wild-type copy of the sqh transcription unit rescues cytokinesis failure and other defects in sqh1. Vertebrate homologs of MRLC-C are phosphorylatable and regulate myosin activity in vitro. These studies provide genetic proof that MRLC-C is required for cytokinesis, suggest a role for the protein in regulating contractile ring function, and establish a genetic system to evaluate its function.

journal_name

Cell

journal_title

Cell

authors

Karess RE,Chang XJ,Edwards KA,Kulkarni S,Aguilera I,Kiehart DP

doi

10.1016/0092-8674(91)90013-o

subject

Has Abstract

pub_date

1991-06-28 00:00:00

pages

1177-89

issue

7

eissn

0092-8674

issn

1097-4172

pii

0092-8674(91)90013-O

journal_volume

65

pub_type

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