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Molecular and Cellular Biology, September 2005, p. 8259-8272, Vol. 25, No. 18
0270-7306/05/$08.00+0     doi:10.1128/MCB.25.18.8259-8272.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Human NDR Kinases Are Rapidly Activated by MOB Proteins through Recruitment to the Plasma Membrane and Phosphorylation

Alexander Hergovich, Samuel J. Bichsel, and Brian A. Hemmings^*

Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland

Received 11 March 2005/ Returned for modification 26 April 2005/ Accepted 16 June 2005

Human nuclear Dbf2-related kinases (NDRs) are up-regulated in certain cancer types, yet their precise function(s) and regulatory mechanism(s) still remain to be defined. Here, we show that active (phosphorylated on Thr444) and inactive human NDRs are both mainly cytoplasmic. Moreover, NDR kinases colocalize at the plasma membrane with human MOBs (hMOBs), which are recently described coactivators of human NDR in vitro. Strikingly, membrane targeting of NDR results in a constitutively active kinase due to phosphorylation on Ser281 and Thr444 that is further activated upon coexpression of hMOBs. Membrane-targeted hMOBs also robustly promoted activation of NDR. We further demonstrate that the in vivo activation of human NDR by membrane-bound hMOBs is dependent on their interaction and occurs solely at the membrane. By using a chimeric molecule of hMOB, which allows inducible membrane translocation, we found that NDR phosphorylation and activation at the membrane occur a few minutes after association of hMOB with membranous structures. We provide insight into a potential in vivo mechanism of NDR activation through rapid recruitment to the plasma membrane mediated by hMOBs.

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* Corresponding author. Mailing address: Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland. Phone: 41 61 697 4872. Fax: 41 61 697 3976. E-mail: brian.hemmings{at}fmi.ch.

Supplemental material for this article may be found at http://mcb.asm.org/.

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Molecular and Cellular Biology, September 2005, p. 8259-8272, Vol. 25, No. 18
0022-538X/05/$08.00+0     doi:10.1128/MCB.25.18.8259-8272.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

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