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Tuning the redox potential of the primary electron donor in bacterial reaction centers by manganese binding and light-induced structural changes.

Author(s): Deshmukh SS, Kálmán L

Biochim Biophys Acta Bioenerg. 2020 Aug 07;:148285 Authors: Deshmukh SS, Kálmán L

Article GUID: 32777306
Bound detergent molecules in bacterial reaction centers facilitate detection of tetryl explosive.

Author(s): Modafferi D, Zazubovich V, Kálmán L

Photosynth Res. 2020 Jul 06;: Authors: Modafferi D, Zazubovich V, Kálmán L

Article GUID: 32632533
Proton release due to manganese binding and oxidation in modified bacterial reaction centers.

Author(s): Kálmán L, Thielges MC, Williams JC, Allen JP

Biochemistry. 2005 Oct 11;44(40):13266-73 Authors: Kálmán L, Thielges MC, Williams JC, Allen JP

Article GUID: 16201752
Comparison of bacterial reaction centers and photosystem II.

Author(s): Kálmán L, Williams JC, Allen JP

Photosynth Res. 2008 Oct-Dec;98(1-3):643-55 Authors: Kálmán L, Williams JC, Allen JP

Article GUID: 18853275
Effect of anions on the binding and oxidation of divalent manganese and iron in modified bacterial reaction centers.

Author(s): Tang K, Williams JC, Allen JP, Kálmán L

Biophys J. 2009 Apr 22;96(8):3295-304 Authors: Tang K, Williams JC, Allen JP, Kálmán L

Article GUID: 19383473
Light-induced conformational changes in photosynthetic reaction centers: dielectric relaxation in the vicinity of the dimer.

Author(s): Deshmukh SS, Williams JC, Allen JP, Kálmán L

Biochemistry. 2011 Jan 25;50(3):340-8 Authors: Deshmukh SS, Williams JC, Allen JP, Kálmán L

Article GUID: 21141811
Light-induced conformational changes in photosynthetic reaction centers: redox-regulated proton pathway near the dimer.

Author(s): Deshmukh SS, Williams JC, Allen JP, Kálmán L

Biochemistry. 2011 Apr 26;50(16):3321-31 Authors: Deshmukh SS, Williams JC, Allen JP, Kálmán L

Article GUID: 21410139
Light-induced conformational changes in photosynthetic reaction centers: impact of detergents and lipids on the electronic structure of the primary electron donor.

Author(s): Deshmukh SS, Akhavein H, Williams JC, Allen JP, Kalman L

Biochemistry. 2011 Jun 14;50(23):5249-62 Authors: Deshmukh SS, Akhavein H, Williams JC, Allen JP, Kalman L

Article GUID: 21561160
Lipid binding to the carotenoid binding site in photosynthetic reaction centers.

Author(s): Deshmukh SS, Tang K, Kálmán L

J Am Chem Soc. 2011 Oct 12;133(40):16309-16 Authors: Deshmukh SS, Tang K, Kálmán L

Article GUID: 21894992
The interaction of streptococcal enolase with canine plasminogen: the role of surfaces in complex formation.

Author(s): Balhara V, Deshmukh SS, Kálmán L, Kornblatt JA

PLoS One. 2014;9(2):e88395 Authors: Balhara V, Deshmukh SS, Kálmán L, Kornblatt JA

Article GUID: 24520380
Low potential manganese ions as efficient electron donors in native anoxygenic bacteria.

Author(s): Deshmukh SS, Protheroe C, Ivanescu MA, Lag S, Kálmán L

Biochim Biophys Acta Bioenerg. 2018 Apr;1859(4):227-233 Authors: Deshmukh SS, Protheroe C, Ivanescu MA, Lag S, Kálmán L

Article GUID: 29355486
Title:Bound detergent molecules in bacterial reaction centers facilitate detection of tetryl explosive.
Authors:Modafferi D,  Zazubovich V,  Kálmán L
Link:https://www.ncbi.nlm.nih.gov/pubmed/32632533?dopt=Abstract
DOI:10.1007/s11120-020-00770-7
Category:Photosynth Res
PMID:32632533
Dept Affiliation: PHYSICS
1 Department of Physics, Concordia University, 7141 Sherbrooke Street West, Montreal, QC, H4B 1R6, Canada.
2 Department of Chemical Engineering, McGill University, Montreal, QC, Canada.
3 Department of Physics, Concordia University, 7141 Sherbrooke Street West, Montreal, QC, H4B 1R6, Canada. valter.zazubovits@concordia.ca.
4 Department of Physics, Concordia University, 7141 Sherbrooke Street West, Montreal, QC, H4B 1R6, Canada. laszlo.kalman@concordia.ca.

Description:

Bound detergent molecules in bacterial reaction centers facilitate detection of tetryl explosive.

Photosynth Res. 2020 Jul 06;:

Authors: Modafferi D, Zazubovich V, Kálmán L

Abstract

Bacterial reaction centers (BRC) from Rhodobacter sphaeroides were found to accelerate, about 100-fold, the reaction between tetryl (2,4,6-trinitrophenylmethylnitramine) explosive and n-lauryl-N-N-dimethylamine-N-oxide (LDAO) that results in the formation of picric acid-like product with characteristic UV-VIS absorption spectrum with peaks at 345 and 415 nm. Moreover, this product also affects the spectra of BRC cofactors in the NIR spectral region and stabilizes the conformational changes associated with slow charge recombination. The evolution of the NIR absorption changes correlated with the kinetics of the product formation. Comparison between the wild-type and the R26 carotenoid-less strain indicates that tetryl-LDAO reaction is roughly five times faster for R26, which allows for identifying the carotenoid binding site as the optimal reaction site. Another, less-defined reaction site is located in the BRC's hydrophobic cavity. These effects are highly selective for tetryl and not observed for several other widespread nitric explosives; slowed-down charge recombination allows for distinguishing between tetryl and QB-site herbicides. The current limit of detection is in the ppb range or?~?100 nM. Details of the molecular mechanisms of the reactions and perspectives of using these effects in bioassays or biosensors for explosives detection are also discussed.

PMID: 32632533 [PubMed - as supplied by publisher]