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Department of Biochemistry profile

Professor Iain Lamont

PositionProfessor
DepartmentDepartment of Biochemistry
QualificationsBSc (Edin) DPhil (Oxon)
Research summaryMolecular biology and infectious disease

Research

Iain has a long-standing interest in the molecular genetics of bacteria that cause infectious disease.

He and his research team have a particular focus on the pathogenic bacterium Pseudomonas aeruginosa that causes chronic infections in patients in cystic fibrosis.

P. aeruginosa is a species of bacterium that is widely distributed in the environment and is capable of causing very severe infections. During infection the bacteria secrete a number of agents collectively known as virulence factors that contribute to the pathogenic process. These include proteins (toxins, proteases and phospholipases) and an iron-chelating compound called pyoverdine. Iain and his team are using a wide range of biochemical, molecular biological, and genetic approaches to study the way in which pyoverdine contributes to infection and how it is made.

Current research areas include:

  • Regulation of virulence factor production
  • How does P. aeruginosa exist in cystic fibrosis?
  • Comparative genomics
  • Enzymes that contribute to infection

Publications

Hilliam, Y., Moore, M. P., Lamont, I. L., Bilton, D., Haworth, C. S., Foweraker, J., … Winstanley, C. (2017). Pseudomonas aeruginosa adaptation and diversification in the non-cystic fibrosis bronchiectasis lung. European Respiratory Journal, 49(4), 1602108. doi: 10.1183/13993003.02108-2016

Germoni, L. A. P., Bremer, P. J., & Lamont, I. L. (2016). The effect of alginate lyase on the gentamicin resistance of Pseudomonas aeruginosa in mucoid biofilms. Journal of Applied Microbiology, 121(1), 126-135. doi: 10.1111/jam.13153

Tchesnokov, E. P., Fellner, M., Siakkou, E., Kleffmann, T., Martin, L. W., Aloi, S., Lamont, I. L., Wilbanks, S. M., & Jameson, G. N. L. (2015). The cysteine dioxygenase homologue from Pseudomonas aeruginosa is a 3-mercaptopropionate dioxygenase. Journal of Biological Chemistry, 290(40), 24424-24437. doi: 10.1074/jbc.M114.635672

Lopez-Medina, E., Fan, D., Coughlin, L. A., Ho, E. X., Lamont, I. L., Reimmann, C., … Koh, A. Y. (2015). Candida albicans inhibits Pseudomonas aeruginosa virulence through suppression of pyochelin and pyoverdine biosynthesis. PLoS Pathogens, 11(8), e1005129. doi: 10.1371/journal.ppat.1005129

Freschi, L., Jeukens, J., Kukavica-Ibrulj, I., Boyle, B., Dupont, M.-J., LaRoche, J., … Lamont, I. L., … Levesque, R. C. (2015). Clinical utilization of genomics data produced by the international Pseudomonas aeruginosa consortium. Frontiers in Microbiology, 6, 1036. doi: 10.3389/fmicb.2015.01036

Authored Book - Research

Brumby, A. M., Lamont, I. L., Dodd, I. B., Egan, J. B., Walling, G. A., McEwan, J. C., … Montgomery, G. (1996). Defining the SOS operon of coliphage 186. N/A, 114p.

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Journal - Research Article

Hilliam, Y., Moore, M. P., Lamont, I. L., Bilton, D., Haworth, C. S., Foweraker, J., … Winstanley, C. (2017). Pseudomonas aeruginosa adaptation and diversification in the non-cystic fibrosis bronchiectasis lung. European Respiratory Journal, 49(4), 1602108. doi: 10.1183/13993003.02108-2016

Germoni, L. A. P., Bremer, P. J., & Lamont, I. L. (2016). The effect of alginate lyase on the gentamicin resistance of Pseudomonas aeruginosa in mucoid biofilms. Journal of Applied Microbiology, 121(1), 126-135. doi: 10.1111/jam.13153

Tchesnokov, E. P., Fellner, M., Siakkou, E., Kleffmann, T., Martin, L. W., Aloi, S., Lamont, I. L., Wilbanks, S. M., & Jameson, G. N. L. (2015). The cysteine dioxygenase homologue from Pseudomonas aeruginosa is a 3-mercaptopropionate dioxygenase. Journal of Biological Chemistry, 290(40), 24424-24437. doi: 10.1074/jbc.M114.635672

Freschi, L., Jeukens, J., Kukavica-Ibrulj, I., Boyle, B., Dupont, M.-J., LaRoche, J., … Lamont, I. L., … Levesque, R. C. (2015). Clinical utilization of genomics data produced by the international Pseudomonas aeruginosa consortium. Frontiers in Microbiology, 6, 1036. doi: 10.3389/fmicb.2015.01036

Lopez-Medina, E., Fan, D., Coughlin, L. A., Ho, E. X., Lamont, I. L., Reimmann, C., … Koh, A. Y. (2015). Candida albicans inhibits Pseudomonas aeruginosa virulence through suppression of pyochelin and pyoverdine biosynthesis. PLoS Pathogens, 11(8), e1005129. doi: 10.1371/journal.ppat.1005129

Donaldson, A. E., & Lamont, I. L. (2015). Metabolomics of post-mortem blood: Identifying potential markers of post-mortem interval. Metabolomics, 11(1), 237-245. doi: 10.1007/s11306-014-0691-5

Donaldson, A. E., & Lamont, I. L. (2014). Estimation of post-mortem interval using biochemical markers. Australian Journal of Forensic Sciences, 46(1), 8-26. doi: 10.1080/00450618.2013.784356

Nguyen, A. T., O'Neill, M. J., Watts, A. M., Robson, C. L., Lamont, I. L., Wilks, A., & Oglesby-Sherrouse, A. G. (2014). Adaptation of iron homeostasis pathways by a Pseudomonas aeruginosa pyoverdine mutant in the cystic fibrosis lung. Journal of Bacteriology, 196(12), 2265-2276. doi: 10.1128/JB.01491-14

Llamas, M. A., Imperi, F., Visca, P., & Lamont, I. L. (2014). Cell-surface signaling in Pseudomonas: Stress responses, iron transport and pathogenicity. FEMS Microbiology Reviews, 38, 569-597. doi: 10.1111/1574-6976.12078

Calcott, M. J., Owen, J. G., Lamont, I. L., & Ackerley, D. F. (2014). Biosynthesis of novel pyoverdines by domain substitution in a non-ribosomal peptide synthetase of Pseudomonas aeruginosa. Applied & Environmental Microbiology, 80(18), 5723-5731. doi: 10.1128/aem.01453-14

Edgar, R. J., Xu, X., Shirley, M., Konings, A. F., Martin, L. W., Ackerley, D. F., & Lamont, I. L. (2014). Interactions between an anti-sigma protein and two sigma factors that regulate the pyoverdine signaling pathway in Pseudomonas aeruginosa. BMC Microbiology, 14, 287. doi: 10.1186/s12866-014-0287-2

Butler, M. I., Stockwell, P. A., Black, M. A., Day, R. C., Lamont, I. L., & Poulter, R. T. M. (2013). Pseudomonas syringae pv. actinidiae from recent outbreaks of kiwifruit bacterial canker belong to different clones that originated in China. PLoS ONE, 8(2), e57464. doi: 10.1371/journal.pone.0057464

Reid, D. W., Latham, R., Lamont, I. L., Camara, M., & Roddam, L. F. (2013). Molecular analysis of changes in Pseudomonas aeruginosa load during treatment of a pulmonary exacerbation in cystic fibrosis. Journal of Cystic Fibrosis, 12, 688-699. doi: 10.1016/j.jcf.2013.03.008

Smith, D. J., Lamont, I. L., Anderson, G. J., & Reid, D. W. (2013). Targeting iron uptake to control Pseudomonas aeruginosa infections in cystic fibrosis. European Respiratory Journal, 42(6), 1723-1736. doi: 10.1183/09031936.00124012

Konings, A. F., Martin, L. W., Sharples, K. J., Roddam, L. F., Latham, R., Reid, D. W., & Lamont, I. L. (2013). Pseudomonas aeruginosa uses multiple pathways to acquire iron during chronic infection in cystic fibrosis lungs. Infection & Immunity, 81(8), 2697-2704. doi: 10.1128/IAI.00418-13

Donaldson, A. E., & Lamont, I. L. (2013). Biochemistry changes that occur after death: Potential markers for determining post-mortem interval. PLoS ONE, 8(11), e82011. doi: 10.1371/journal.pone.0082011

Martin, L. W., Reid, D. W., Sharples, K. J., & Lamont, I. L. (2011). Pseudomonas siderophores in the sputum of patients with cystic fibrosis. Biometals, 24(6), 1059-1067. doi: 10.1007/s10534-011-9464-z

Donaldson, A. E., Walker, N. K., Lamont, I. L., Cordiner, S. J., & Taylor, M. C. (2011). Characterising the dynamics of expirated bloodstain pattern formation using high-speed digital video imaging. International Journal of Legal Medicine, 125, 757-762. doi: 10.1007/s00414-010-0498-5

Upritchard, H. G., Yang, J., Bremer, P. J., Lamont, I. L., & McQuillan, A. J. (2011). Adsorption of enterobactin to metal oxides and the role of siderophores in bacterial adhesion to metals. Langmuir, 27(17), 10587-10596. doi: 10.1021/la202352j

Draper, R. C., Martin, L. W., Beare, P. A., & Lamont, I. L. (2011). Differential proteolysis of sigma regulators controls cell-surface signaling in Pseudomonas aeruginosa. Molecular Microbiology, 82(6), 1444-1453. doi: 10.1111/j.1365-2958.2011.07901.x

Donaldson, A., Taylor, M. C., Cordiner, S. J., & Lamont, I. L. (2010). Using oral microbial DNA analysis to identify expirated bloodspatter. International Journal of Legal Medicine, 124(6), 569-576. doi: 10.1007/s00414-010-0426-8

Nakatani, Y., Lamont, I. L., & Cutfield, J. F. (2010). Discovery and characterization of a distinctive exo-1,3/1,4-β-glucanase from the marine bacterium Pseudoalteromonas sp. strain BB1. Applied & Environmental Microbiology, 76(20), 6760-6768. doi: 10.1128/AEM.00758-10

McMillan, D. G. G., Velasquez, I., Nunn, B. L., Goodlett, D. R., Hunter, K. A., Lamont, I., Sander, S. G., & Cook, G. M. (2010). Acquisition of iron by alkaliphilic Bacillus species. Applied & Environmental Microbiology, 76(20), 6955-6961. doi: 10.1128/AEM.01393-10

Yeterian, E., Martin, L. W., Guillon, L., Journet, L., Lamont, I. L., & Schalk, I. J. (2010). Synthesis of the siderophore pyoverdine in Pseudomonas aeruginosa involves a periplasmic maturation. Amino Acids, 38(5), 1447-1459. doi: 10.1007/s00726-009-0358-0

Yeterian, E., Martin, L. W., Lamont, I. L., & Schalk, I. J. (2010). An efflux pump is required for siderophore recycling by Pseudomonas aeruginosa. Environmental Microbiology Reports, 2(3), 412-418. doi: 10.1111/j.1758-2229.2009.00115.x

Lamont, I. L., Konings, A. F., & Reid, D. W. (2009). Iron acquisition by Pseudomonas aeruginosa in the lungs of patients with cystic fibrosis. Biometals, 22(1), 53-60. doi: 10.1007/s10534-008-9197-9

Schalk, I. J., Lamont, I. L., & Cobessi, D. (2009). Structure-function relationships in the bifunctional ferrisiderophore FpvA receptor from Pseudomonas aeruginosa. Biometals, 22(4), 671-678. doi: 10.1007/s10534-008-9203-2

Ramsay, J. P., Sullivan, J. T., Jambari, N., Ortori, C. A., Heeb, S., Williams, P., … Lamont, I. L., & Ronson, C. W. (2009). A LuxRI-family regulatory system controls excision and transfer of the Mesorhizobium loti strain R7A symbiosis island by activating expression of two conserved hypothetical genes. Molecular Microbiology, 73(6), 1141-1155. doi: 10.1111/j.1365-2958.2009.06843.x

Mettrick, K. A., & Lamont, I. L. (2009). Different roles for anti-sigma factors in siderophore signalling pathways of Pseudomonas aeruginosa. Molecular Microbiology, 74(5), 1257-1271. doi: 10.1111/j.1365-2958.2009.06932.x

Shirley, M., & Lamont, I. L. (2009). Role of TonB1 in pyoverdine-mediated signaling in Pseudomonas aeruginosa. Journal of Bacteriology, 191(18), 5634-5640. doi: 10.1128/JB.00742-09

Reid, D. W., Anderson, G. J., & Lamont, I. L. (2009). Role of lung iron in determining the bacterial and host struggle in cystic fibrosis. American Journal of Physiology: Lung Cellular & Molecular Physiology, 297(5), L795-L802. doi: 10.1152/ajplung.00132.2009

Upritchard, H. G., Cordwell, S. J., & Lamont, I. L. (2008). Immunoproteomics to examine cystic fibrosis host interactions with extracellular Pseudomonas aeruginosa proteins. Infection & Immunity, 76(10), 4624-4632. doi: 10.1128/IAI.01707-07

Spencer, M. R., Beare, P. A., & Lamont, I. L. (2008). Role of cell surface signaling in proteolysis of an alternative sigma factor in Pseudomonas aeruginosa. Journal of Bacteriology, 190(14), 4865-4869.

Diggle, S. P., Matthijs, S., Wright, V. J., Fletcher, M. P., Chhabra, S. R., Lamont, I. L., … Williams, P. (2007). The Pseudomonas aeruginosa 4-quinolone signal molecules HHQ and PQS play multifunctional roles in quorum sensing and iron entrapment. Chemistry & Biology, 14, 87-96.

Carlton, T. M., Sullivan, J. T., Stuart, G. S., Hutt, K., Lamont, I. L., & Ronson, C. W. (2007). Ferrichrome utilization in a mesorhizobial population: Microevolution of a three-locus system. Environmental Microbiology, 9(12), 2923-2932.

Upritchard, H. G., Yang, J., Bremer, P. J., Lamont, I. L., & McQuillan, A. J. (2007). Adsorption to metal oxides of the Pseudomonas aeruginosa siderophore pyoverdine and implications for bacterial biofilm formation on metals. Langmuir, 23(13), 7189-7195.

Visca, P., Imperi, F., & Lamont, I. L. (2007). Pyoverdine siderophores: From biogenesis to biosignificance. Trends in Microbiology, 15(1), 22-30.

Ramsay, J. P., Sullivan, J. T., Stuart, G. S., Lamont, I. L., & Ronson, C. W. (2006). Excision and transfer of the Mesorhizobium loti R7A symbiosis island requires an integrase IntS, a novel recombination directionality factor RdfS, and a putative relaxase RlxS. Molecular Microbiology, 62(3), 723-734. doi: 10.1111/j.1365-2958.2006.05396.x

Lamont, I. L., Martin, L. W., Sims, T., Scott, A., & Wallace, M. (2006). Characterization of a gene encoding an acetylase required for pyoverdine synthesis in Pseudomonas aeruginosa. Journal of Bacteriology, 188(8), 3149-3152. doi: 10.1128/JB.188.8.3149-3152.2006

Wilson, M. J., & Lamont, I. L. (2006). Mutational analysis of an extracytoplasmic-function sigma factor to investigate its interactions with RNA polymerase and DNA. Journal of Bacteriology, 188(5), 1935-1942.

Yang, J., Bremer, P. J., Lamont, I. L., & McQuillan, A. J. (2006). Infrared spectroscopic studies of siderophore-related hydroxamic acid ligands adsorbed on titanium dioxide. Langmuir, 22(24), 10109-10117.

James, H. E., Beare, P. A., Martin, L. W., & Lamont, I. L. (2005). Mutational analysis of a bifunctional ferrisiderophore receptor and signal-transducing protein from Pseudomonas aeruginosa. Journal of Bacteriology, 187(13), 4514-4520.

Caradoc-Davies, T. T., Cutfield, S. M., Lamont, I. L., & Cutfield, J. F. (2004). Crystal structures of Escherichia coli uridine phosphorylase in two native and three complexed forms reveal basis of substrate specificity, induced conformational changes and influence of potassium. Journal of Molecular Biology, 337, 337-354.

Ackerley, D. F., & Lamont, I. L. (2004). Characterization and genetic manipulation of peptide synthetases in Pseudomonas aeruginosa PAO1 in order to generate novel pyoverdines. Chemistry & Biology, 11, 971-980.

McWhirter, M. J., Bremer, P. J., Lamont, I. L., & McQuillan, A. J. (2003). Siderophore-mediated covalent bonding to metal (oxide) surfaces during biofilm initiation by Pseudomonas aeruginosa bacteria. Langmuir, 19, 3575-3577.

Beare, P., For, R. J., Martin, L., & Lamont, I. L. (2003). Siderophore-mediated cell signalling in Pseudomonas aeruginosa: Divergent pathways regulate virulence factor production and siderophore receptor synthesis. Molecular Microbiology, 47(1), 195-207.

Lamont, I. L., & Martin, L. (2003). Identification and characterization of novel pyoverdine synthesis genes in Pseudomonas aeruginosa. Microbiology, 149, 833-842.

Ackerley, D. F., Caradoc-Davies, T. T., & Lamont, I. L. (2003). Substrate specificity of the nonribosomal peptide synthetase PvdD from Pseudomonas aeruginosa. Journal of Bacteriology, 185(9), 2848-2855.

Visca, P., Leoni, L., Wilson, M. J., & Lamont, I. L. (2002). Iron transport and regulation, cell signalling and genomics: Lessons from Escherichia coli and Pseudomonas. Molecular Microbiology, 45(5), 1177-1190.

Lamont, I. L., Beare, P. A., Ochsner, U., Vasil, A., & Vasil, M. L. (2002). Siderophore-mediated signaling regulates virulence factor production in Pseudomonas aeruginosa. PNAS, 99(10), 7072-7077.

Adhikari, R. P., Cook, G. M., Lamont, I., Lang, S., Heffernan, H., & Smith, J. M. B. (2002). Phenotypic and molecular characterization of community occurring, Western Samoan phage pattern methicillin-resistant Staphyococcus aureus. Journal of Antimicrobial Chemotherapy, 50, 825-831.

Wilderman, P. J., Vasil, A. I., Johnson, Z., Wilson, M. J., Cunliffe, H. E., Lamont, I. L., & Vasil, M. L. (2001). Characterization of an endoprotease (PrpL) encoded by a PvdS-regulated gene in Pseudomonas aeruginosa. Infection & Immunity, 69(9), 5385-5394.

Wilson, M. J., McMorran, B. J., & Lamont, I. L. (2001). Analysis of promoters recognized by PvdS, an extracytoplasmic function sigma factor protein from Pseudomonas aeruginosa. Journal of Bacteriology, 183(6), 2151-2155.

McMorran, B. J., Shantha Kumara, H. M., Sullivan, K., & Lamont, I. L. (2001). Involvement of a transformylase enzyme in siderophore synthesis in Pseudomonas aeruginosa. Microbiology, 147, 1-8.

Al-Samarrai, T. H., Zhang, N. X., Lamont, I. L., Martin, L., Kolbe, J., Wilsher, M., … Schmid, J. (2000). Simple and inexpensive but highly discriminating method of computer-assisted DNA fingerprinting of Pseudomonas aeruginosa. Journal of Clinical Microbiology, 38(12), 4445-4452.

Wilson, M. J., & Lamont, I. L. (2000). Characterization of an ECF sigma factor protein from Pseudomonas aeruginosa. Biochemical & Biophysical Research Communications, 273(2), 578-583.

Rae, J. L., Cutfield, J. F., & Lamont, I. L. (1997). Sequences and expression of pyruvate dehydrogenase genes from Pseudomonas aeruginosa. Journal of Bacteriology, 179(11), 3561-3571.

Ochsner, O. A., Johnson, Z., Lamont, I. L., Cunliffe, H. E., & Vasil, M. L. (1996). Exotoxin A production in Pseudomonas aeruginosa requires the iron-regulated pvdS gene encoding an alternative sigma factor. Molecular Microbiology, 21(5), 1019-1028. doi: 10.1046/j.1365-2958.1996.481425.x

McMorran, B. J., Merriman, M. E., Rombel, I. T., & Lamont, I. L. (1996). Characterisation of the pvdE gene which is required for pyoverdine synthesis in Pseudomonas aeruginosa. Gene, 176(1/2), 55-59.

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Journal - Research Other

Smith, D. J., Anderson, G. J., Lamont, I. L., Masel, P., Campbell, S. C., & Reid, D. W. (2013). Accurate assessment of systemic iron status in cystic fibrosis will avoid the hazards of inappropriate iron supplementation. Journal of Cystic Fibrosis, 12(3), 303-304. doi: 10.1016/j.jcf.2012.10.001

Lamont, I. L. (2003). Bacterial intercellular signalling and infectious disease. Australian Biochemist, 34(2), 4-6.

Lamont, I. L., & Beare, P. (2003). Iron uptake, cell signalling and gene expression in Pseudomonas aeruginosa. New Zealand BioScience, 12(4), 15-16.

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