The plant pathogen Pectobacterium atrosepticum contains a functional formate hydrogenlyase-2 complex

Alexander J. Finney, Rebecca Lowden, Michal Fleszar, Marta Albareda, Sarah J. Coulthurst, Frank Sargent (Lead / Corresponding author)

Research output: Contribution to journalArticle

Abstract

Pectobacterium atrosepticum SCRI1043 is a phytopathogenic gram-negative enterobacterium. Genomic analysis has identified that genes required for both respiration and fermentation are expressed under anaerobic conditions. One set of anaerobically expressed genes is predicted to encode an important but poorly-understood membrane-bound enzyme termed formate hydrogenlyase-2 (FHL-2), which has fascinating evolutionary links to the mitochondrial NADH dehydrogenase (Complex I). In this work, molecular genetic and biochemical approaches were taken to establish that FHL-2 is fully functional in P. atrosepticum and is the major source of molecular hydrogen gas generated by this bacterium. The FHL-2 complex was shown to comprise a rare example of an active [NiFe]-hydrogenase-4 (Hyd-4) isoenzyme, itself linked to an unusual selenium-free formate dehydrogenase in the final complex. In addition, further genetic dissection of the genes encoding the predicted membrane arm of FHL-2 established surprisingly that the majority of genes encoding this domain are not required for physiological hydrogen production activity. Overall, this study presents P. atrosepticum as a new model bacterial system for understanding anaerobic formate and hydrogen metabolism in general, and FHL-2 function and structure in particular.

Original languageEnglish
Number of pages27
JournalMolecular Microbiology
Early online date17 Aug 2019
DOIs
Publication statusE-pub ahead of print - 17 Aug 2019

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Pectobacterium
Hydrogen
formic acid
Genes
Formate Dehydrogenases
Electron Transport Complex I
Membranes
Enterobacteriaceae
Selenium
Isoenzymes
Fermentation
Dissection
Molecular Biology
Respiration
Gases
formate hydrogenlyase
Bacteria
Enzymes

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Finney, Alexander J. ; Lowden, Rebecca ; Fleszar, Michal ; Albareda, Marta ; Coulthurst, Sarah J. ; Sargent, Frank. / The plant pathogen Pectobacterium atrosepticum contains a functional formate hydrogenlyase-2 complex. In: Molecular Microbiology. 2019.
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abstract = "Pectobacterium atrosepticum SCRI1043 is a phytopathogenic gram-negative enterobacterium. Genomic analysis has identified that genes required for both respiration and fermentation are expressed under anaerobic conditions. One set of anaerobically expressed genes is predicted to encode an important but poorly-understood membrane-bound enzyme termed formate hydrogenlyase-2 (FHL-2), which has fascinating evolutionary links to the mitochondrial NADH dehydrogenase (Complex I). In this work, molecular genetic and biochemical approaches were taken to establish that FHL-2 is fully functional in P. atrosepticum and is the major source of molecular hydrogen gas generated by this bacterium. The FHL-2 complex was shown to comprise a rare example of an active [NiFe]-hydrogenase-4 (Hyd-4) isoenzyme, itself linked to an unusual selenium-free formate dehydrogenase in the final complex. In addition, further genetic dissection of the genes encoding the predicted membrane arm of FHL-2 established surprisingly that the majority of genes encoding this domain are not required for physiological hydrogen production activity. Overall, this study presents P. atrosepticum as a new model bacterial system for understanding anaerobic formate and hydrogen metabolism in general, and FHL-2 function and structure in particular.",
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The plant pathogen Pectobacterium atrosepticum contains a functional formate hydrogenlyase-2 complex. / Finney, Alexander J.; Lowden, Rebecca; Fleszar, Michal; Albareda, Marta; Coulthurst, Sarah J.; Sargent, Frank (Lead / Corresponding author).

In: Molecular Microbiology, 17.08.2019.

Research output: Contribution to journalArticle

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