Biochemical properties of CumA multicopper oxidase from plant pathogen, Pseudomonas syringae

Author:

Ishida Konan1ORCID,Tsukamoto Yuya2,Horitani Masaki34ORCID,Ogawa Tomohisa15,Tanaka Yoshikazu1ORCID

Affiliation:

1. Graduate School of Life Sciences, Tohoku University, Sendai, Japan

2. Department of Earth Science, Graduate School of Science, Tohoku University, Sendai, Japan

3. Department of Applied Biochemistry and Food Science, Saga University, Honjo-machi, Japan

4. United Graduate School of Agricultural Science, Kagoshima University, Kagoshima, Japan

5. Graduate School of Agricultural Science, Tohoku University, Sendai, Japan

Abstract

ABSTRACT Multicopper oxidases have a wide range of substrate specificity to be involved in various physiological reactions. Pseudomonas syringae, a plant pathogenic bacterium, has a multicopper oxidase, CumA. Multicopper oxidases have ability to degrade plant cell wall component, lignin. Once P. syringae enter apoplast and colonize, they start to disrupt plant immunity. Therefore, deeper understanding of multicopper oxidases from plant pathogens helps to invent measures to prevent invasion into plant cell, which brings agricultural benefits. Several biochemical studies have reported lower activity of CumA compared with other multicopper oxidase called CotA. However, the mechanisms underlying the difference in activity have not yet been revealed. In order to acquire insight into them, we conducted a biophysical characterization of PsCumA. Our results show that PsCumA has weak type I copper EPR signal, which is essential for oxidation activity. We propose that difference in the coordination of copper ions may decrease reaction frequency.

Funder

Son-Masayoshi foundation

JSPS

Publisher

Oxford University Press (OUP)

Subject

Organic Chemistry,Molecular Biology,Applied Microbiology and Biotechnology,General Medicine,Biochemistry,Analytical Chemistry,Biotechnology

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