Journal Article

FZJ-2021-05891

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A new twist of rubredoxin function in M. tuberculosis

Sushko, T. ; Kavaleuski, A. ; Grabovec, I. ; Kavaleuskaya, A. ; Vakhrameev, D. ; Bukhdruker, S. ; Marin, E. ; Kuzikov, A. ; Shumyantseva, V. ; Masamrekh, R. ; Tsumoto, K. ; Borshchevskiy, V.FZJ* ; Strushkevich, N. ; Gilep, A. (Corresponding author)

2021
Elsevier San Diego, Calif.

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Please use a persistent id in citations: http://hdl.handle.net/2128/29689  doi:10.1016/j.bioorg.2021.104721

Abstract: Electron transfer mediated by metalloproteins drives many biological processes. Rubredoxins are a ubiquitous [1Fe-0S] class of electron carriers that play an important role in bacterial adaptation to changing environmental conditions. In Mycobacterium tuberculosis, oxidative and acidic stresses as well as iron starvation induce rubredoxins expression. However, their functions during M. tuberculosis infection are unknown. In the present work, we show that rubredoxin B (RubB) is able to efficiently shuttle electrons from cognate reductases, FprA and FdR to support catalytic activity of cytochrome P450s, CYP124, CYP125, and CYP142, which are important for bacterial viability and pathogenicity. We solved the crystal structure of RubB and characterized the interaction between RubB and CYPs using site-directed mutagenesis. Mutations that not only neutralize single charge but also change the specific residues on the surface of RubB did not dramatically decrease activity of studied CYPs. Together with isothermal calorimetry (ITC) experiments, the obtained results suggest that interactions are transient and not highly specific. The redox potential of RubB is −264 mV vs. Ag/AgCl and the measured extinction coefficients are 9931 M−1cm−1 and 8371 M−1cm−1 at 380 nm and 490 nm, respectively. Characteristic parameters of RubB along with the discovered function might be useful for biotechnological applications. Our findings suggest that a switch from ferredoxins to rubredoxins might be crucial for M. tuberculosis to support CYPs activity during the infection.

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Contributing Institute(s):

1. Strukturbiochemie (IBI-7)

Research Program(s):

1. 5241 - Molecular Information Processing in Cellular Systems (POF4-524) (POF4-524)

Appears in the scientific report 2021

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Database coverage:
; ; BIOSIS Previews ; Biological Abstracts ; Chemical Reactions ; Clarivate Analytics Master Journal List ; Current Contents - Life Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; Index Chemicus ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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