Role of yceA-cybB-yceB operon in oxidative stress tolerance, swimming motility and antibiotic susceptibility of Stenotrophomonas maltophilia

Author:

Liao Chun-Hsing12ORCID,Ku Ren-Hsuan3,Li Li-Hua45ORCID,Wu Cheng-Mu3,Yang Tsuey-Ching3

Affiliation:

1. Division of Infectious Diseases, Far Eastern Memorial Hospital , New Taipei City, Taiwan , Republic of China

2. Departmentof Medicine, National Yang Ming Chiao Tung University , Taipei, Taiwan , Republic of China

3. Department of Biotechnology and Laboratory Science in Medicine, National Yang Ming Chiao Tung University , Taipei, Taiwan , Republic of China

4. Department of Pathology and Laboratory Medicine, Taipei Veterans General Hospital , Taipei, Taiwan , Republic of China

5. School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University , Taipei, Taiwan , Republic of China

Abstract

Abstract Background Stenotrophomonas maltophilia is ubiquitous in the environment and is an important MDR opportunistic pathogen. Oxidative stress is an inevitable challenge to an aerobic bacterium. Accordingly, S. maltophilia has many capabilities to face variable oxidative stress. Some of the oxidative stress alleviation systems cross-protect bacteria from antibiotics. In our recent RNA-sequencing transcriptome analysis, we documented the increased expression of a three-gene cluster, yceA-cybB-yceB, in the presence of hydrogen peroxide (H2O2). The YceI-like, cytochrome b561 and YceI-like proteins encoded by yceA, cybB and yceB are located in the cytoplasm, inner membrane and periplasm, respectively. Objectives To characterize the role of the yceA-cybB-yceB operon of S. maltophilia in oxidative stress tolerance, swimming motility and antibiotic susceptibility. Methods The presence of the yceA-cybB-yceB operon was verified by RT–PCR. The functions of this operon were revealed by in-frame deletion mutant construction and complementation assay. Expression of the yceA-cybB-yceB operon was assessed by quantitative RT–PCR. Results The yceA, cybB and yceB genes form an operon. Loss of function of the yceA-cybB-yceB operon compromised menadione tolerance, enhanced swimming motility and increased susceptibility to fluoroquinolone and β-lactam antibiotics. The expression of the yceA-cybB-yceB operon was up-regulated by oxidative stress, such as H2O2 and superoxide, and not impacted by antibiotics, such as fluoroquinolone and β-lactams. Conclusions The evidence strongly supports the view that the physiological function of the yceA-cybB-yceB operon is to alleviate oxidative stress. The operon provides an additional example that oxidative stress alleviation systems can cross-protect S. maltophilia from antibiotics.

Funder

National Science and Technology Council of Taiwan

National Yang Ming Chiao Tung University

Far Eastern Memorial Hospital

Publisher

Oxford University Press (OUP)

Subject

Infectious Diseases,Pharmacology (medical),Pharmacology,Microbiology (medical)

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