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Article

Further Studies on the 3-Ketosteroid 9α-Hydroxylase of Rhodococcus ruber Chol-4, a Rieske Oxygenase of the Steroid Degradation Pathway

Department of Biochemistry and Molecular Biology, Universidad Complutense de Madrid, c/Jose Antonio Novais 12, 28040 Madrid, Spain
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Authors to whom correspondence should be addressed.
Academic Editor: Elías R. Olivera
Microorganisms 2021, 9(6), 1171; https://doi.org/10.3390/microorganisms9061171
Received: 27 April 2021 / Revised: 26 May 2021 / Accepted: 27 May 2021 / Published: 29 May 2021
(This article belongs to the Special Issue Bacterial Steroid Catabolism)
The biochemistry and genetics of the bacterial steroid catabolism have been extensively studied during the last years and their findings have been essential to the development of biotechnological applications. For instance, metabolic engineering of the steroid-eater strains has allowed to obtain intermediaries of industrial value. However, there are still some drawbacks that must be overcome, such as the redundancy of the steroid catabolism genes in the genome and a better knowledge of its genetic regulation. KshABs and KstDs are key enzymes involved in the aerobic breakage of the steroid nucleus. Rhodococcus ruber Chol-4 contains three kshAs genes, a single kshB gene and three kstDs genes within its genome. In the present work, the growth of R. ruber ΔkshA strains was evaluated on different steroids substrates; the promoter regions of these genes were analyzed; and their expression was followed by qRT-PCR in both wild type and ksh mutants. Additionally, the transcription level of the kstDs genes was studied in the ksh mutants. The results show that KshA2B and KshA1B are involved in AD metabolism, while KshA3B and KshA1B contribute to the cholesterol metabolism in R. ruber. In the kshA single mutants, expression of the remaining kshA and kstD genes is re-organized to survive on the steroid substrate. These data give insight into the fine regulation of steroid genes when several isoforms are present. View Full-Text
Keywords: 3-ketosteroid 9α-hydroxylase; steroids; Rhodococcus ruber; AD; ADD 3-ketosteroid 9α-hydroxylase; steroids; Rhodococcus ruber; AD; ADD
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MDPI and ACS Style

Baldanta, S.; Navarro Llorens, J.M.; Guevara, G. Further Studies on the 3-Ketosteroid 9α-Hydroxylase of Rhodococcus ruber Chol-4, a Rieske Oxygenase of the Steroid Degradation Pathway. Microorganisms 2021, 9, 1171. https://doi.org/10.3390/microorganisms9061171

AMA Style

Baldanta S, Navarro Llorens JM, Guevara G. Further Studies on the 3-Ketosteroid 9α-Hydroxylase of Rhodococcus ruber Chol-4, a Rieske Oxygenase of the Steroid Degradation Pathway. Microorganisms. 2021; 9(6):1171. https://doi.org/10.3390/microorganisms9061171

Chicago/Turabian Style

Baldanta, Sara, Juana M. Navarro Llorens, and Govinda Guevara. 2021. "Further Studies on the 3-Ketosteroid 9α-Hydroxylase of Rhodococcus ruber Chol-4, a Rieske Oxygenase of the Steroid Degradation Pathway" Microorganisms 9, no. 6: 1171. https://doi.org/10.3390/microorganisms9061171

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