The Rhodococcus ruber Actinomycetes, Key and Universal Biooxidizers of С2−С4 Gaseous Alkanes
摘要
The interest in microorganisms capable of oxidizing higher gaseous methane homologs (ethane, propane, and n-butane) is presently on the rise. Among propane- and butane-oxidizing bacteria, Rhodococcus ruber are especially attractive, since they easily adapt to extreme environmental conditions and possess a significant biotechnological potential. The review stresses the importance of R. ruber as a bioindicator of oil and gas deposits and as a component of microbial consortia for degradation of hydrocarbons and other xenobiotics. The data on natural substrates and ecological niches of gas-oxidizing rhodococci are presented, and their morphological and physiological properties are described. The role of Rhodococcus in biogeochemical cycles and the potential for their industrial application are discussed. Analysis of the functional genes and enzyme systems for catabolism of gaseous hydrocarbons (С2−С4) was used to reveal the key stages of propane oxidation in rhodococci and the role of propanotrophy in R. ruber bioremediation potential. Necessity for further investigation for the understanding of the mechanisms involving in adaptation of these microorganisms to anthropogenic impacts is substantiated.