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. 2017 Dec 4;10:288. doi: 10.1186/s13068-017-0976-9

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — The hybrid pathway for nicotine degradation in A. tumefaciens S33 (a) and its nicotine-degrading gene cluster (b). NdhAB, nicotine dehydrogenase; Paz, pseudoazurin; Hno, 6-hydroxynicotine oxidase; Pno, 6-hydroxypseudooxynicotine oxidase; Ald, putative aldehyde dehydrogenase; Hsh, 6-hydroxy-3-succinoylpyridine hydroxylase; Hpo, 2,5-dihydroxypyridine dioxygenase; Nfo, N-formylmaleamate deformylase; Ami, maleamate amidohydrolase (amidase); Iso, maleate cis/trans-isomerase. The red cross in panel a indicates that the pathway has been blocked by disabling the enzyme Hno; the black cross in panel b shows our strategy of disrupting the hno gene