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Unraveling the 17β-Estradiol Degradation Pathway in Novosphingobium tardaugens NBRC 16725
We have analyzed the catabolism of estrogens in Novosphingobium tardaugens NBRC 16725, which is able to use endocrine disruptors such as 17β-estradiol, estrone, and estriol as sole carbon and energy sources. A transcriptomic analysis enabled the identification of a cluster of catabolic genes (edc cl...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Frontiers Media S.A.
2020
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7793797/ https://www.ncbi.nlm.nih.gov/pubmed/33424788 http://dx.doi.org/10.3389/fmicb.2020.588300 |
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author | Ibero, Juan Galán, Beatriz Rivero-Buceta, Virginia García, José L. |
author_facet | Ibero, Juan Galán, Beatriz Rivero-Buceta, Virginia García, José L. |
author_sort | Ibero, Juan |
collection | PubMed |
description | We have analyzed the catabolism of estrogens in Novosphingobium tardaugens NBRC 16725, which is able to use endocrine disruptors such as 17β-estradiol, estrone, and estriol as sole carbon and energy sources. A transcriptomic analysis enabled the identification of a cluster of catabolic genes (edc cluster) organized in two divergent operons that are involved in estrogen degradation. We have developed genetic tools for this estrogen-degrading bacterium, allowing us to delete by site-directed mutagenesis some of the genes of the edc cluster and complement them by using expression plasmids to better characterize their precise role in the estrogen catabolism. Based on these results, a catabolic pathway is proposed. The first enzyme of the pathway (17β-hydroxysteroid dehydrogenase) used to transform 17β-estradiol into estrone is encoded out of the cluster. A CYP450 encoded by the edcA gene performs the second metabolic step, i.e., the 4-hydroxylation of estrone in this strain. The edcB gene encodes a 4-hydroxyestrone-4,5-dioxygenase that opens ring A after 4-hydroxylation. The initial steps of the catabolism of estrogens and cholate proceed through different pathways. However, the degradation of estrogens converges with the degradation of testosterone in the final steps of the lower catabolic pathway used to degrade the common intermediate 3aα-H-4α(3′-propanoate)7a-β-methylhexahydro-1,5-indanedione (HIP). The TonB-dependent receptor protein EdcT appears to be involved in estrogen uptake, being the first time that this kind of proteins has been involved in steroid transport. |
format | Online Article Text |
id | pubmed-7793797 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-77937972021-01-09 Unraveling the 17β-Estradiol Degradation Pathway in Novosphingobium tardaugens NBRC 16725 Ibero, Juan Galán, Beatriz Rivero-Buceta, Virginia García, José L. Front Microbiol Microbiology We have analyzed the catabolism of estrogens in Novosphingobium tardaugens NBRC 16725, which is able to use endocrine disruptors such as 17β-estradiol, estrone, and estriol as sole carbon and energy sources. A transcriptomic analysis enabled the identification of a cluster of catabolic genes (edc cluster) organized in two divergent operons that are involved in estrogen degradation. We have developed genetic tools for this estrogen-degrading bacterium, allowing us to delete by site-directed mutagenesis some of the genes of the edc cluster and complement them by using expression plasmids to better characterize their precise role in the estrogen catabolism. Based on these results, a catabolic pathway is proposed. The first enzyme of the pathway (17β-hydroxysteroid dehydrogenase) used to transform 17β-estradiol into estrone is encoded out of the cluster. A CYP450 encoded by the edcA gene performs the second metabolic step, i.e., the 4-hydroxylation of estrone in this strain. The edcB gene encodes a 4-hydroxyestrone-4,5-dioxygenase that opens ring A after 4-hydroxylation. The initial steps of the catabolism of estrogens and cholate proceed through different pathways. However, the degradation of estrogens converges with the degradation of testosterone in the final steps of the lower catabolic pathway used to degrade the common intermediate 3aα-H-4α(3′-propanoate)7a-β-methylhexahydro-1,5-indanedione (HIP). The TonB-dependent receptor protein EdcT appears to be involved in estrogen uptake, being the first time that this kind of proteins has been involved in steroid transport. Frontiers Media S.A. 2020-12-07 /pmc/articles/PMC7793797/ /pubmed/33424788 http://dx.doi.org/10.3389/fmicb.2020.588300 Text en Copyright © 2020 Ibero, Galán, Rivero-Buceta and García. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Microbiology Ibero, Juan Galán, Beatriz Rivero-Buceta, Virginia García, José L. Unraveling the 17β-Estradiol Degradation Pathway in Novosphingobium tardaugens NBRC 16725 |
title | Unraveling the 17β-Estradiol Degradation Pathway in Novosphingobium tardaugens NBRC 16725 |
title_full | Unraveling the 17β-Estradiol Degradation Pathway in Novosphingobium tardaugens NBRC 16725 |
title_fullStr | Unraveling the 17β-Estradiol Degradation Pathway in Novosphingobium tardaugens NBRC 16725 |
title_full_unstemmed | Unraveling the 17β-Estradiol Degradation Pathway in Novosphingobium tardaugens NBRC 16725 |
title_short | Unraveling the 17β-Estradiol Degradation Pathway in Novosphingobium tardaugens NBRC 16725 |
title_sort | unraveling the 17β-estradiol degradation pathway in novosphingobium tardaugens nbrc 16725 |
topic | Microbiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7793797/ https://www.ncbi.nlm.nih.gov/pubmed/33424788 http://dx.doi.org/10.3389/fmicb.2020.588300 |
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