Evaluation of Rpf protein of Micrococcus luteus for cultivation of soil actinobacteria |
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| Institution: | 1. Marine Microbiology Group, Department of Animal and Microbial Biodiversity, Mediterranean Institute for Advanced Studies (IMEDEA UIB-CSIC), Esporles, Spain;2. Department of Physiology, Genetics and Microbiology, Universidad de Alicante, Alicante, Spain;1. College of Geography and Environmental Science, Zhejiang Normal University, Jinhua, 321004, China;2. Department of Meteorology, COMSATS University, Islamabad, 44000, Pakistan;3. Environmental Science Research and Design Institute of Zhejiang Province, Hangzhou, 310007, China;1. Federal Research Center “Fundamentals of Biotechnology” of the Russian Academy of Sciences, Moscow, Russia;2. Skolkovo Institute of Science and Technology, Moscow, Russia;3. Institute for Information Transmission Problems, Moscow, Russia;4. Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia;5. Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia |
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| Abstract: | Rpf protein, a kind of resuscitation promoting factor, was first found in the culture supernatant of Micrococcus luteus. It can resuscitate the growth of M. luteus in “viable but non-culture, VBNC” state and promote the growth of Gram-positive bacteria with high G + C content. This paper investigates the resuscitating activity of M. luteus ACCC 41016T Rpf protein, which was heterologously expressed in E. coli, to cells of M. luteus ACCC 41016T and Rhodococcus marinonascens HBUM200062 in VBNC state, and examines the effect on the cultivation of actinobacteria in soil. The results showed that the recombinant Rpf protein had resuscitation effect on M. luteus ACCC 41016T and R. marinonascens HBUM200062 in VBNC state. 83 strains of actinobacteria, which were distributed in 9 families and 12 genera, were isolated from the experimental group with recombinant Rpf protein in the culture medium. A total of 41 strains of bacteria, which were distributed in 8 families and 9 genera, were isolated from the control group without Rpf protein. The experimental group showed richer species diversity than the control group. Two rare actinobacteria, namely HBUM206391T and HBUM206404T, were obtained in the experimental group supplemented with Rpf protein. Both may be potential new species of Actinomadura and Actinokineospora, indicating that the recombinant expression of M. luteus ACCC 41016T Rpf protein can effectively promote the isolation and culture of actinobacteria in soil. |
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| Keywords: | Rpf Actinobacteria VBNC Cultivation |
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