Proteomic Profile of the Bacterium Sinorhizobium meliloti Depends on Its Life Form and Host Plant Species


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Abstract—The importance of root nodule bacteria in biotechnology is determined by their distinctive feature: symbiotic nitrogen fixation resulting in the production of organic nitrogen-containing compounds. While interacting with host legume plants, the cells of these bacteria undergo global changes at all levels of expression of genetic information leading to the formation in root nodules of so-called bacteroids functioning as nitrogen fixation factories. The molecular mechanisms underlying plant-microbial symbiosis are actively investigated, and one of the most interesting and poorly studied aspects of this problem is the species-specificity of interaction between root nodule bacteria and host plants. In this work we have performed the proteomic analysis of the Sinorhizobium meliloti bacteroids isolated from two legume species: alfalfa (Medicago sativa L.) and yellow sweet clover (Melilotus officinalis L.). It has been shown that the S. meliloti bacteroids produce a lot of proteins (many of them associated with symbiosis) in a host-specific manner, i.e., only in certain host plant species. It has been demonstrated for the first time that the levels of expression in bacteroids of the genes encoding the ExoZ and MscL proteins responsible for the synthesis of surface lipopolysaccharides and formation of a large conductance mechanosensitive channel, respectively, depend on a host plant species that confirms the results of proteomic analysis. Overall, our data show that the regulation of bacteroid development by the host plant has species-specific features.

作者简介

K. Antonets

All-Russia Research Institute of Agricultural Microbiology; St. Petersburg State University

Email: ant.nizhnikov@gmail.com
俄罗斯联邦, Pushkin, St. Petersburg, 196608; St. Petersburg, 199034

O. Onishchuk

All-Russia Research Institute of Agricultural Microbiology

Email: ant.nizhnikov@gmail.com
俄罗斯联邦, Pushkin, St. Petersburg, 196608

O. Kurchak

All-Russia Research Institute of Agricultural Microbiology

Email: ant.nizhnikov@gmail.com
俄罗斯联邦, Pushkin, St. Petersburg, 196608

K. Volkov

St. Petersburg State University

Email: ant.nizhnikov@gmail.com
俄罗斯联邦, St. Petersburg, 199034

A. Lykholay

St. Petersburg State University

Email: ant.nizhnikov@gmail.com
俄罗斯联邦, St. Petersburg, 199034

E. Andreeva

St. Petersburg State University

Email: ant.nizhnikov@gmail.com
俄罗斯联邦, St. Petersburg, 199034

E. Andronov

All-Russia Research Institute of Agricultural Microbiology; St. Petersburg State University

Email: ant.nizhnikov@gmail.com
俄罗斯联邦, Pushkin, St. Petersburg, 196608; St. Petersburg, 199034

A. Pinaev

All-Russia Research Institute of Agricultural Microbiology

Email: ant.nizhnikov@gmail.com
俄罗斯联邦, Pushkin, St. Petersburg, 196608

N. Provorov

All-Russia Research Institute of Agricultural Microbiology

Email: ant.nizhnikov@gmail.com
俄罗斯联邦, Pushkin, St. Petersburg, 196608

A. Nizhnikov

All-Russia Research Institute of Agricultural Microbiology; St. Petersburg State University

编辑信件的主要联系方式.
Email: ant.nizhnikov@gmail.com
俄罗斯联邦, Pushkin, St. Petersburg, 196608; St. Petersburg, 199034

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