Site-specific processing of Ras and Rap1 Switch I by a MARTX toxin effector domain

Irena Antic, Marco Biancucci, Yueming Zhu, David R. Gius and Karla J. F. Satchell ()
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Irena Antic: Feinberg School of Medicine, Northwestern University
Marco Biancucci: Feinberg School of Medicine, Northwestern University
Yueming Zhu: Feinberg School of Medicine, Northwestern University
David R. Gius: Feinberg School of Medicine, Northwestern University
Karla J. F. Satchell: Feinberg School of Medicine, Northwestern University

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: Abstract Ras (Rat sarcoma) protein is a central regulator of cell growth and proliferation. Mutations in the RAS gene are known to occur in human cancers and have been shown to contribute to carcinogenesis. In this study, we show that the multifunctional-autoprocessing repeats-in-toxin (MARTX) toxin-effector domain DUF5Vv from Vibrio vulnificus to be a site-specific endopeptidase that cleaves within the Switch 1 region of Ras and Rap1. DUF5Vv processing of Ras, which occurs both biochemically and in mammalian cell culture, inactivates ERK1/2, thereby inhibiting cell proliferation. The ability to cleave Ras and Rap1 is shared by DUF5Vv homologues found in other bacteria. In addition, DUF5Vv can cleave all Ras isoforms and KRas with mutations commonly implicated in malignancies. Therefore, we speculate that this new family of Ras/Rap1-specific endopeptidases (RRSPs) has potential to inactivate both wild-type and mutant Ras proteins expressed in malignancies.

Date: 2015
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DOI: 10.1038/ncomms8396

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