What question did this study set out to answer?

To investigate the molecular function, cell cycle regulation, and subcellular dynamics of human ECT2 in cytokinesis.

November 29, 1999The Journal of Cell BiologyOpen Access

Human Ect2 Is an Exchange Factor for Rho Gtpases, Phosphorylated in G2/M Phases, and Involved in Cytokinesis

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Authors

TTTakashi TatsumotoNational Cancer Institute XXXiaozhen XieNational Cancer Institute RBRayah BlumenthalNational Institutes of Health

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Implication

Experimental study reveals ECT2 regulates cytokinesis via cell cycle-dependent Rho GTPase activation in human cells, indicating a key link between cell division and Rho signaling.

Key Points

To investigate the molecular function, cell cycle regulation, and subcellular dynamics of human ECT2 in cytokinesis.
Assayed guanine nucleotide exchange factor activity of ECT2 toward RhoA, Rac1, and Cdc42, and evaluated phosphorylation across cell cycle stages.
Tracked ECT2 subcellular localization during interphase, prometaphase, and cytokinesis.
Inhibited ECT2 function via expression of a COOH-terminal truncated dominant-negative mutant and microinjection of anti-ECT2 antibodies into interphase cells.
ECT2 catalyzed guanine nucleotide exchange on RhoA, Rac1, and Cdc42, with exchange activity strictly dependent on phosphorylation during G2 and M phases.
ECT2 localized to the nucleus during interphase, dispersed throughout the cytoplasm during prometaphase, and concentrated at the midbody during cytokinesis.
Expression of the NH2-terminal midbody-localizing domain lacking the catalytic domain or microinjection of anti-ECT2 antibodies strongly inhibited cytokinesis.

Cite This Study

Tatsumoto et al. (1999) studied this question.

synapsesocial.com/papers/6a71c72d75498292b70b230b https://doi.org/10.1083/jcb.147.5.921

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Implication

Experimental study reveals ECT2 regulates cytokinesis via cell cycle-dependent Rho GTPase activation in human cells, indicating a key link between cell division and Rho signaling.

Human Ect2 Is an Exchange Factor for Rho Gtpases, Phosphorylated in G2/M Phases, and Involved in Cytokinesis

Discussion

Member takes

Implication

Key Points

Cite This Study

Human Ect2 Is an Exchange Factor for Rho Gtpases, Phosphorylated in G2/M Phases, and Involved in Cytokinesis

Discussion

Member takes

Implication

Key Points

Cite This Study

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