Src Signaling in a Low-complexity Unicellular Kinome

Overview

Journal Sci Rep

Specialty Science

Date 2018 Mar 31

PMID 29599515

Citations 6

Authors

Hiroshi Suga

W Todd Miller

Affiliations

Soon will be listed here.

Abstract

Creolimax fragrantissima is a member of the ichthyosporean clade, the earliest branching holozoan lineage. The kinome of Creolimax is markedly reduced as compared to those of metazoans. In particular, Creolimax possesses a single non-receptor tyrosine kinase: CfrSrc, the homolog of c-Src kinase. CfrSrc is an active tyrosine kinase, and it is expressed throughout the lifecycle of Creolimax. In animal cells, the regulatory mechanism for Src involves tyrosine phosphorylation at a C-terminal site by Csk kinase. The lack of Csk in Creolimax suggests that a different mode of negative regulation must exist for CfrSrc. We demonstrate that CfrPTP-3, one of the 7 tyrosine-specific phosphatases (PTPs) in Creolimax, suppresses CfrSrc activity in vitro and in vivo. Transcript levels of CfrPTP-3 and two other PTPs are significantly higher than that of CfrSrc in the motile amoeboid and sessile multinucleate stages of the Creolimax life cycle. Thus, in the context of a highly reduced kinome, a pre-existing PTP may have been co-opted for the role of Src regulation. Creolimax represents a unique model system to study the adaptation of tyrosine kinase signaling and regulatory mechanisms.

Citing Articles

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