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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 DUF5 Vv  from  Vibrio vulnificus  to be a site-specific endopeptidase that cleaves within the Switch 1 region of Ras and Rap1. DUF5 Vv  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 DUF5 Vv  homologues found in other bacteria. In addition, DUF5 Vv  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.

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