Biography

Career: 

2008-2013 University of East Anglia. RCUK Fellow on Biochemistry of Microbial Metabolism

2007-2008 University of East Anglia. Senior Research Associate on NERC-funded grant, 'Functional and molecular biodiversity of the bacterial production of the climate-changing gas deimethyl sulphide.'

2006-2007 University of East Anglia. Senior Research Associate on BBSRC-funded grant, 'Molecular analysis of gene regulators in the remarkable iron-ome of the symbiotic bacterium Rhizobium.'

2003-2006 University of East Anglia. Senior Research Associate on BBSRC-funded grant, 'Life beyond fur - novel regulators and novel targets in the iron regulon of Rhizobium.'

2000-2004 University of East Anglia. PhD, 'RirA, a novel iron-responsive regulator in the symbiotic bacterium Rhizobium leguminosarum.'


Researcher ID

http://www.researcherid.com/rid/B-8967-2009


Website

http://jontoddresearch.com/  

All Publications

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Curson, A. R. J., Liu, J., Bermejo Martinez, A., Green, R. T., Chan, Y., Carrión, O., Williams, B. T., Zhang, S., Yang, G., Bulman Page, P. C., Zhang, X., Todd, J. D.

(2017)

Dimethylsulfoniopropionate biosynthesis in marine bacteria and identification of the key gene in this process,

in Nature Microbiology

2

article no. 17009

Full Text UEA Repository

(Article)

(Published)


Schnicker, N. J., De Silva, S. M., Todd, J. D., Dey, M.

(2017)

Structural and Biochemical Insights into Dimethylsulfoniopropionate Cleavage by Cofactor-bound DddK from the Prolific Marine Bacterium Pelagibacter,

in Biochemistry

Full Text UEA Repository

(Article)

(E-pub ahead of print)


Johnston, A., Green, R., Todd, J.

(2016)

Enzymatic breakage of dimethylsulfoniopropionate - a signature molecule for life at sea,

in Current Opinion in Chemical Biology

31

pp. 58-65

Full Text UEA Repository

(Article)

(Published)


Sun, J., Todd, J. D., Thrash, J. C., Qian, Y., Qian, M. C., Temperton, B., Guo, J., Fowler, E. K., Aldrich, J. T., Nicora, C. D., Lipton, M. S., Smith, R. D., De Leenheer, P., Payne, S. H., Johnston, A. W., Davie-Martin, C. L., Halsey, K. H., Giovannoni, S. J.

(2016)

The abundant marine bacterium Pelagibacter simultaneously catabolizes dimethylsulfoniopropionate to the gases dimethyl sulfide and methanethiol,

in Nature Microbiology

1

article no. 16065

Full Text UEA Repository

(Article)

(Published)


Carrion Fonseca, O., Curson, A., Kumaresan, D., Fu, Y., Lang, A., Mercadé, E., Todd, J.

(2015)

A novel pathway producing dimethylsulphide in bacteria is widespread in soil environments,

in Nature Communications

6

article no. 6579

Full Text UEA Repository

(Article)

(Published)


Brummett, A. E., Schnicker, N. J., Crider, A., Todd, J., Dey, M.

(2015)

Biochemical, Kinetic, and Spectroscopic Characterization of Ruegeria pomeroyi DddW-A Mononuclear Iron-Dependent DMSP Lyase,

in PLoS ONE

10

(5)

article no. e0127288

Full Text UEA Repository

(Article)

(Published)


Curson, A., Burns, O., Voget, S., Daniel, R., Todd, J., McInnis, K., Wexler, M., Johnston, A.

(2014)

Screening of Metagenomic and Genomic Libraries Reveals Three Classes of Bacterial Enzymes That Overcome the Toxicity of Acrylate,

UEA Repository

(Paper)

(Published)


Curson, A. R. J., Burns, O. J., Voget, S., Daniel, R., Todd, J. D., McInnis, K., Wexler, M., Johnston, A. W. B.

(2014)

Screening of Metagenomic and Genomic Libraries Reveals Three Classes of Bacterial Enzymes That Overcome the Toxicity of Acrylate,

in PLoS ONE

9

(5)

article no. e97660

Full Text UEA Repository

(Article)

(Published)


Green, R., Todd, J., Johnston, A.

(2013)

Manganese uptake in marine bacteria; the novel MntX transporter is widespread in Roseobacters, Vibrios, Alteromonadales and the SAR11 and SAR116 clades,

in The ISME Journal

7

(3)

pp. 581-591

Full Text UEA Repository

(Article)

(Published)


Todd, J., Kirkwood, M., Newton-Payne, S., Johnston, A.

(2012)

DddW, a third DMSP lyase in a model Roseobacter marine bacterium, Ruegeria pomeroyi DSS-3,

in The ISME Journal

6

(1)

pp. 223-226

Full Text UEA Repository

(Article)

(Published)


Curson, A., Fowler, E., Dickens, S., Johnston, A., Todd, J.

(2012)

Multiple DMSP lyases in the γ-proteobacterium Oceanimonas doudoroffii,

in Biogeochemistry

110

(1-3)

pp. 109-119

Full Text UEA Repository

(Article)

(Published)


Sun, L., Curson, A., Todd, J., Johnston, A.

(2012)

Diversity of DMSP transport in marine bacteria, revealed by genetic analyses,

in Biogeochemistry

110

(1-3)

pp. 121-130

Full Text UEA Repository

(Article)

(Published)


Todd, J., Curson, A., Sullivan, M., Kirkwood, M., Johnston, A.

(2012)

The Ruegeria pomeroyi acuI Gene Has a Role in DMSP Catabolism and Resembles yhdH of E. coli and Other Bacteria in Conferring Resistance to Acrylate,

in PLoS ONE

7

(4)

article no. e35947

Full Text UEA Repository

(Article)

(Published)


Curson, A., Todd, J., Sullivan, M., Johnston, A.

(2011)

Catabolism of dimethylsulphoniopropionate: microorganisms, enzymes and genes,

in Nature Reviews Microbiology

9

(12)

pp. 849-859

Full Text UEA Repository

(Article)

(Published)


White, G., Singleton, C., Todd, J., Cheesman, M., Johnston, A., Le Brun, N.

(2011)

Heme binding to the second, lower-affinity site of the global iron regulator Irr from Rhizobium leguminosarum promotes oligomerization,

in FEBS Journal

278

(12)

pp. 2011-2021

Full Text UEA Repository

(Article)

(Published)


Todd, J., Curson, A., Kirkwood, M., Sullivan, M., Green, R., Johnston, A.

(2011)

DddQ, a novel, cupin-containing, dimethylsulfoniopropionate lyase in marine roseobacters and in uncultured marine bacteria,

in Environmental Microbiology

13

(2)

pp. 427-438

Full Text UEA Repository

(Article)

(Published)


Sullivan, M., Curson, A., Shearer, N., Todd, J., Green, R., Johnston, A.

(2011)

Unusual regulation of a leaderless operon involved in the catabolism of dimethylsulfoniopropionate in Rhodobacter sphaeroides,

in PLoS ONE

6

(1)

article no. e15972

Full Text UEA Repository

(Article)

(Published)


Curson, A., Sullivan, M., Todd, J., Johnston, A.

(2011)

DddY, a periplasmic dimethylsulfoniopropionate lyase found in taxonomically diverse species of Proteobacteria,

in The ISME Journal

5

(7)

pp. 1191-1200

Full Text UEA Repository

(Article)

(Published)


Singleton, C., White, G., Todd, J., Marritt, S., Cheesman, M., Johnston, A., Le Brun, N.

(2010)

Heme-responsive DNA binding by the global iron regulator Irr from Rhizobium leguminosarum,

in The Journal of Biological Chemistry

285

(21)

pp. 16023-16031

Full Text UEA Repository

(Article)

(Published)


Kirkwood, M., Le Brun, N., Todd, J., Johnston, A.

(2010)

The dddP gene of Roseovarius nubinhibens encodes a novel lyase that cleaves dimethylsulfoniopropionate into acrylate plus dimethyl sulfide,

in Microbiology

156

(6)

pp. 1900-1906

Full Text UEA Repository

(Article)

(Published)


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Key Research Interests

I am a molecular microbiologist who is interested in how a broad range of microbes, both Prokaryotic and Eukaryotic, participate in biogeochemical cycling. My research group focuses on the specific mechanisms that allow such organisms to synthesise and breakdown key biological molecules and importantly regulate these processes as to allow them to sense and respond to environmental cues.


Current Research Projects: 

  • Identification and characterisation of the ways in which microbes breakdown the anti-stress molecule dimethylsulphoniopropionate (DMSP) that is made by many marine phytoplankton, macroalgae and a few angiosperms. This microbial DMSP catabolism is central to the global sulphur cycle, can affect both the local and global climate and is an important signaling cue to many higher organisms. (With Prof. AWB Johnston, funded by NERC and BBSRC
     
  • How and why do Eukaryotic Algae make DMSP? As well as studying the catabolism of DMSP we are also identifying the ways in which algae make the most abundant sulphurous molecule in the oceans and importantly why do they do so. Surprisingly the exact function of DMSP remains unclear. (With Dr Thomas Mock, funded by NERC)
  • Studies of mechanisms involved in metal transport and metal responsive gene regulation in Rhizobium and marine proteobacteria. (With Prof. AWB Johnston, funded by BBSRC)
  • Analysis of Carbon Monoxide Dehydrogenase enzymes in marine roeobacters that serve to detoxify this respiratory inhibitor. (With Dr Michael Cunliffe at the Marine Biological Association)
  • A study into denitrification in marine roseobacters. We are interested in the expression, regulation and enzymology of a suit of denitrification genes that exist in these microaerobic organisms. (with Dr Andrew Gates)


Life in our Research Group: 

As a research group we use molecular genetics to study i. how a wide range of microbes catabolise dimethylsulfoniopropionate (DMSP), the most abundant sulphur-containing anti-stress molecule in the oceans; and more recently ii. how Eukaryotic phytoplankton, macroalgae and a few marine plants that make DMSP do so and importantly why. The application of molecular genetics to the field DMSP research by us and notably by Mary Anne Moran’s group at the University of Georgia has been responsible for discovering the mechanisms by which many marine bacteria and some fungi breakdown DMSP generating the important gases DMS and Methanethiol. Our studies into the generation of DMS from DMSP through the enzyme products of the ddd genes has found that there is remarkable diversity in the ways in which different microbes do this this (six different Ddd enzymes have identified thus far); that the ddd genes are the subject of widespread horizontal gene transfer; and that these enzymes appear to have differing physiological roles depending on the organism that contains them (potentially involved in growth, respiration or signaling processes). Quite aside from needing to understand the role played by DMSP in primary producers, studies into its catobolism by microbes are important because DMS is a significant chemo-attractant for marine animals, its oxidation products are “cloud condensation nuclei” that initiate cloud formation over the oceans and it and methanthiol are a key intermediates in the global sulphur cycle .

Our other main running research theme in the lab revolves around how microbes, both marine and terrestrial, acquire and regulate the acquisition of essential transition metals, such as iron and manganese, from their environment. In the past we have worked on how this is carried out in Rhizobia, a terrestrial alpha-proteobacterium that forms nitrogen fixing symbiosis with leguminous plants. As a result of this work we found that alpha-proteobaterial Fe homeostasis does not conform to the conventional Fur global regulator system. In model organisms, such as E. coli, Fur represses many genes in response to iron availability. Instead we found that two global regulators, called Irr and RirA, work in concert to control the expression of many genes under conditions of iron availability in the alpha’s. Using biochemistry coupled to molecular genetics we found that Irr regulates gene expression in response to haem availability, whereas RirA is an iron-sulphur containing regulator that represses in the presence of its co-factor.

Since aphaproteobacteria are incredibly abundant in the ocean and through a combination of genomics, bioinformatics, transcrptomics coupled to molecular genetics we are beginning to address the way in which these marine bugs both acquire their essential metals and control this acquisition. It is surprising how little molecular biology is carried out on marine systems despite their importance and abundance.

As detailed in our “Current Research Topics” we have other projects on going, but these are very much in their infancy. All our lab projects are microbiological based involve molecular genetics, genomics and bioinformatics. Some of our projects involve metagenomics molecular ecology, metabolomics and biochemistry.

We pride ourselves on having a friendly, but, hardworking lab atmosphere. Everybody cares for their lab colleagues and actively participates in weekly lab meetings

Our work benefits from collaboration with colleagues in the Norwich Research Park (Nick Le Brun, Charles Brearley, Thomas Mock, Lionel Hill, Tony Davy, Phil Page, Phil Poole, Arnoud van Vliet, Yohan Chan, Allan Downie and Paul Nicholson) and elsewhere (such as Andrew Lang, Jeffrey Waller, Chris Dupont, Krystal Rypien, Michael Steinke, Dmitry Rodionov, Steve Giovanonni, Colin Murrell and Hendrik Schaefer). 

PhD Positions

Click here for current PhD opportunities in Biological Sciences. But feel free to email me to discuss projects outside these areas and alternative sources of funding.

Postdocs and Fellows: 

I welcome enquiries from motivated postdocs who are interested in applying for their own funding to come and work in my lab. 

 

 

 

 

 

 

Teaching Interests

BIO-2B02: Molecular Biology

BIO-3C20: Molecular Plant Microbe Interactions 

CMPSMB4Y: Fundamentals of Computational and Structural Genomics

BIO-3C10: Molecular Cell Biology 

BIO-3C41: Genomes, Genes and Genomics

BIO-M101: Microbial and Enzyme Biotechnology

BIO-1A61: Introductory Chemistry for Life Sciences

External Activities and Indicators of Esteem

  • Referee for international journals and grants
  • Member of the Society of General Microbiology 2004 - present
  • Member of the Editorial Board of Frontiers in microbial Physiology and Metabolism, a speciality of Frontiers in Microbiology (from March 2012)
  • Involved in organising the Molecular Microbial Ecology Group Annual Meeting in December 2012 at UEA with Prof Colin Murrell

Key Responsibilities

Module organiser for BIO-3C20: Molecular Plant Microbe Interactions

Organiser of the BIO 2B02 Molecular Biology practical

Represent Molecules and Pathways theme on the PhD interview panel