Staff profile

Biography and research interests.

Johan’s expertise is in molecular cloning, genome editing, synthetic and metabolic engineering biotechnology in a broad range of Agri biotech and crop/microbial strain engineering projects. He has been involved in project design and management in academic and private industry. Particular interests are in research towards quality or yield improvement of plants and microbes leading to sustainable solutions in food, phytochemical and industrial intermediate chemical production through plant and strain metabolic engineering. Johan holds a PhD degree from Durham University (2000), an undergraduate degree from the University of Amsterdam and a MSc. from the Free University Amsterdam.   Up to 1993, he was research scientist in the private company Florigene Europe/Free University Amsterdam, studying flavonoid biosynthesis with special interest in key regulatory and blue color genes for design of novel flowers using genetic engineering.   Until 2011, as Senior Research Associate in the laboratories of Prof. Antoni Slabas in Durham University Biosciences and with a multitude of industrial collaborative partners, he was involved in metabolic engineering of lipid/oil pathways in plants and microbes. From 2011, Johan joined a sustainability research division in a state of the art, multidisciplinary chemical industry Biotec R & D team within Invista Intermediates, a subsidiary of privately owned Koch Industries Inc. His role was Bioscientist Molecular and Synthetic Biology, applying forefront approaches to provide sustainable solutions for polymer production.   Johan re-joined Durham University Biosciences in 2014 – current, as Senior Experimental Officer/Instructor and facility/lab manager with Prof. Patrick Hussey who was serving as Pro-Vice-Chancellor (Science) at the time (until 2019). Additionally, he is also closely involved with strategic project/experimental design and instruction in projects/students teaching/consultation in several different research groups and teaching modules.

Research groups

• Durham Centre for Crop Improvement Technology
• Molecular Plant Sciences

• Genome engineering, synthetic and metabolic engineering Agribusiness/Biotechnology and crop/microbial strain engineering projects
• Lipids and homeostasis
• Secondary metabolites
• Cytoskeleton associated proteins

Conference Paper

• Mutagenesis of squash (Cucurbita moschata) glycerol-3-phosphate acyltransferase (GPAT) to produce an enzyme with altered substrate selectivity
  
  Hayman, M., Fawcett, T., Schierer, T., Simon, J., Kroon, J., Gilroy, J., Rice, D., Rafferty, J., Turnbull, A., Sedelnikova, S., & Slabas, A. (2000). Mutagenesis of squash (Cucurbita moschata) glycerol-3-phosphate acyltransferase (GPAT) to produce an enzyme with altered substrate selectivity. Biochemical Society Transactions, 28(6), 680-681. https://doi.org/10.1042/bst0280680

Journal Article

• Exo84c interacts with VAP27 to regulate exocytotic compartment degradation and stigma senescence
  
  Zhang, T., Li, Y., Li, C., Zang, J., Gao, E., Kroon, J. T., Qu, X., Hussey, P. J., & Wang, P. (2023). Exo84c interacts with VAP27 to regulate exocytotic compartment degradation and stigma senescence. Nature Communications, 14(1), Article 4888. https://doi.org/10.1038/s41467-023-40729-5
• NET4 and RabG3 link actin to the tonoplast and facilitate cytoskeletal remodelling during stomatal immunity
  
  Hawkins, T. J., Kopischke, M., Duckney, P. J., Rybak, K., Mentlak, D. A., Kroon, J. T. M., Bui, M. T., Richardson, A. C., Casey, M., Alexander, A., De Jaeger, G., Kalde, M., Moore, I., Dagdas, Y., Hussey, P. J., & Robatzek, S. (2023). NET4 and RabG3 link actin to the tonoplast and facilitate cytoskeletal remodelling during stomatal immunity. Nature Communications, 14(1), Article 5848. https://doi.org/10.1038/s41467-023-41337-z
• Extracellular ATP targets Arabidopsis RIBONUCLEASE 1 to suppress mycotoxin stress-induced cell death
  
  Goodman, H. L., Kroon, J. T., Tomé, D. F., Hamilton, J. M., Alqarni, A. O., & Chivasa, S. (2022). Extracellular ATP targets Arabidopsis RIBONUCLEASE 1 to suppress mycotoxin stress-induced cell death. New Phytologist, 235(4), 1531-1542. https://doi.org/10.1111/nph.18211
• TraB family proteins are components of ER-mitochondrial contact sites and regulate ER-mitochondrial interactions and mitophagy
  
  Li, C., Duckney, P., Zhang, T., Fu, Y., Li, X., Kroon, J., De Jaeger, G., Cheng, Y., Hussey, P. J., & Wang, P. (2022). TraB family proteins are components of ER-mitochondrial contact sites and regulate ER-mitochondrial interactions and mitophagy. Nature Communications, 13, Article 5658. https://doi.org/10.1038/s41467-022-33402-w
• Isolation of Arabidopsis extracellular ATP‐binding proteins by affinity proteomics and identification of PHOSPHOLIPASE C‐LIKE 1 as an extracellular protein essential for fumonisin B1 toxicity
  
  Smith, S. J., Goodman, H., Kroon, J. T., Brown, A. P., Simon, W. J., & Chivasa, S. (2021). Isolation of Arabidopsis extracellular ATP‐binding proteins by affinity proteomics and identification of PHOSPHOLIPASE C‐LIKE 1 as an extracellular protein essential for fumonisin B1 toxicity. Plant Journal, 106(5), 1387-1400. https://doi.org/10.1111/tpj.15243
• NETWORKED2‐Subfamily Proteins Regulate the Cortical Actin Cytoskeleton of Growing Pollen Tubes and Polarised Pollen Tube Growth
  
  Duckney, P., Kroon, J. T., Dixon, M. R., Hawkins, T. J., Deeks, M. J., & Hussey, P. J. (2021). NETWORKED2‐Subfamily Proteins Regulate the Cortical Actin Cytoskeleton of Growing Pollen Tubes and Polarised Pollen Tube Growth. New Phytologist, 231(1), 152-164. https://doi.org/10.1111/nph.17391
• A PXY-Mediated Transcriptional Network Integrates Signaling Mechanisms to Control Vascular Development in Arabidopsis
  
  Smit, M., McGregor, S., Sun, H., Gough, C., Bågman, A., Soyars, C., Kroon, J., Gaudinier, A., Williams, C., Yang, X., Nimchuk, Z., Weijers, D., Turner, S., Brady, S., & Etchells, J. (2020). A PXY-Mediated Transcriptional Network Integrates Signaling Mechanisms to Control Vascular Development in Arabidopsis. Plant Cell, 32, 319-335. https://doi.org/10.1105/tpc.19.00562
• Organ-specific genetic interactions between paralogues of the PXY and ER receptor kinases enforce radial patterning in Arabidopsis vascular tissue
  
  Wang, N., Bagdassarian, K., Doherty, R., Kroon, J., Connor, K., Wang, X., Wang, W., Jermyn, I., Turner, S., & Etchells, J. (2019). Organ-specific genetic interactions between paralogues of the PXY and ER receptor kinases enforce radial patterning in Arabidopsis vascular tissue. Development., 146(10), Article 177105. https://doi.org/10.1242/dev.177105
• Actin–membrane interactions mediated by NETWORKED2 in Arabidopsis pollen tubes through associations with Pollen Receptor-Like Kinase 4 and 5
  
  Duckney, P., Deeks, M., Dixon, M., Kroon, J., Hawkins, T., & Hussey, P. (2017). Actin–membrane interactions mediated by NETWORKED2 in Arabidopsis pollen tubes through associations with Pollen Receptor-Like Kinase 4 and 5. New Phytologist, 216(4), 1170-1180. https://doi.org/10.1111/nph.14745
• Cyclin-dependent kinase activity enhances phosphatidylcholine biosynthesis in Arabidopsis by repressing phosphatidic acid phosphohydrolase activity
  
  Craddock, C. P., Adams, N., Kroon, J. T., Bryant, F. M., Hussey, P. J., Kurup, S., & Eastmond, P. J. (2017). Cyclin-dependent kinase activity enhances phosphatidylcholine biosynthesis in Arabidopsis by repressing phosphatidic acid phosphohydrolase activity. Plant Journal, 89(1), 3-14. https://doi.org/10.1111/tpj.13321
• A Novel Function for Arabidopsis CYCLASE1 in Programmed Cell Death Revealed by Isobaric Tags for Relative and Absolute Quantitation (iTRAQ) Analysis of Extracellular Matrix Proteins
  
  Smith, S. J., Kroon, J. T., Simon, W. J., Slabas, A. R., & Chivasa, S. (2015). A Novel Function for Arabidopsis CYCLASE1 in Programmed Cell Death Revealed by Isobaric Tags for Relative and Absolute Quantitation (iTRAQ) Analysis of Extracellular Matrix Proteins. Molecular and Cellular Proteomics, 14(6), 1556-1568. https://doi.org/10.1074/mcp.m114.045054
• Proteomics reveals new insights into the role of light in cadmium response in Arabidopsis cell suspension cultures.
  
  Wang, Y., Kroon, J., Slabas, A., & Chivasa, S. (2013). Proteomics reveals new insights into the role of light in cadmium response in Arabidopsis cell suspension cultures. Proteomics, 13(7), 1145-1158. https://doi.org/10.1002/pmic.201200321
• Tissue-specific whole transcriptome sequencing in castor, directed at understanding triacylglycerol lipid biosynthetic pathways
  
  Brown, A., Kroon, J., Swarbreck, D., Febrer, M., Larson, T., Graham, I., Caccamo, M., & Slabas, A. (2012). Tissue-specific whole transcriptome sequencing in castor, directed at understanding triacylglycerol lipid biosynthetic pathways. PLoS ONE, 7(2), Article e30100. https://doi.org/10.1371/journal.pone.0030100
• Components of Complex Lipid Biosynthetic Pathways in Developing Castor (Ricinus communis) Seeds Identified by MudPIT Analysis of Enriched Endoplasmic Reticulum
  
  Brown, A., Kroon, J., Topping, J., Robson, J., Simon, W., & Slabas, A. (2011). Components of Complex Lipid Biosynthetic Pathways in Developing Castor (Ricinus communis) Seeds Identified by MudPIT Analysis of Enriched Endoplasmic Reticulum. Journal of Proteome Research, 10(8), 3565-3577. https://doi.org/10.1021/pr2002066
• A phosphatidate phosphatase double mutant provides a new insight into plant membrane lipid homeostasis
  
  Eastmond, P., Quettier, A., Kroon, J., Craddock, C., Adams, N., & Slabas, A. (2011). A phosphatidate phosphatase double mutant provides a new insight into plant membrane lipid homeostasis. Plant Signaling & Behavior, 6(4), 526-527. https://doi.org/10.4161/psb.6.4.14748
• PHOSPHATIDIC ACID PHOSPHOHYDROLASE1 and 2 Regulate Phospholipid Synthesis at the Endoplasmic Reticulum in Arabidopsis
  
  Eastmond, P. J., Quettier, A., Kroon, J. T., Craddock, C., Adams, N., & Slabas, A. R. (2010). PHOSPHATIDIC ACID PHOSPHOHYDROLASE1 and 2 Regulate Phospholipid Synthesis at the Endoplasmic Reticulum in Arabidopsis. Plant Cell, 22(8), 2796-2811. https://doi.org/10.1105/tpc.109.071423
• Recessive mutations in the putative calcium-activated chloride channel Anoctamin 5 cause proximal LGMD2L and distal MMD3 muscular dystrophies.
  
  Bolduc, V., Marlow, G., Boycott, K., Saleki, K., Inoue, H., Kroon, J., Itakura, M., Robitaille, Y., Parent, L., Baas, F., Mizuta, K., Kamata, N., Richard, I., Linssen, W., Mahjneh, I., de Visser, M., Bashir, R., & Brais, B. (2010). Recessive mutations in the putative calcium-activated chloride channel Anoctamin 5 cause proximal LGMD2L and distal MMD3 muscular dystrophies. American Journal of Human Genetics, 86(2), 213-221. https://doi.org/10.1016/j.ajhg.2009.12.013
• Proof of function of a putative 3-hydroxyacyl-acyl carrier protein dehydratase from higher plants by mass spectrometry of product formation.
  
  Brown, A., Affleck, V., Kroon, J., & Slabas, A. (2009). Proof of function of a putative 3-hydroxyacyl-acyl carrier protein dehydratase from higher plants by mass spectrometry of product formation. FEBS Letters, 583(2), 363-368. https://doi.org/10.1016/j.febslet.2008.12.022
• Identification and functional expression of a type 2 acyl-CoA:diacylglycerol acyltransferase (DGAT2) in developing castor bean seeds which has high homology to the major triglyceride biosynthetic enzyme of fungi and animals
  
  Kroon, J. T., Wei, W., Simon, W. J., & Slabas, A. R. (2006). Identification and functional expression of a type 2 acyl-CoA:diacylglycerol acyltransferase (DGAT2) in developing castor bean seeds which has high homology to the major triglyceride biosynthetic enzyme of fungi and animals. Phytochemistry, 67(23), 2541-2549. https://doi.org/10.1016/j.phytochem.2006.09.020
• Identification and functional expression of a type 2 acyl-CoA :diacylglycerol acyltransferase (DGAT2) in developing castor bean seedswhich has high homology to the major triglyceride biosynthetic enzymeof fungi and animals.
  
  Kroon, J., Wei, W., Simon, J., & Slabas, A. (2006). Identification and functional expression of a type 2 acyl-CoA :diacylglycerol acyltransferase (DGAT2) in developing castor bean seedswhich has high homology to the major triglyceride biosynthetic enzymeof fungi and animals. Phytochemistry, 67(23), 2541-2549.
• Arabidopsis RecQsim, a plant-specific member of the RecQ helicase family, can suppress the MMS hypersensitivity of the yeast sgs1 mutant.
  
  Bagherieh-Najjar, M. B., de Vries, O. M., Kroon, J. T., Wright, E. L., Elborough, K. M., Hille, J., & Dijkwel, P. P. (2003). Arabidopsis RecQsim, a plant-specific member of the RecQ helicase family, can suppress the MMS hypersensitivity of the yeast sgs1 mutant. Plant Molecular Biology, 52(2), 273-284. https://doi.org/10.1023/a%3A1023968429220
• Squash glycerol-3-phosphate (1)-acyltransferase - Alteration of substrate selectivity and identification of arginine and lysineresidues important in catalytic activity
  
  Slabas, A., Kroon, J., Scheirer, T., Gilroy, J., Hayman, M., Rice, D., Turnbull, A., Rafferty, J., Fawcett, T., & Simon, W. (2002). Squash glycerol-3-phosphate (1)-acyltransferase - Alteration of substrate selectivity and identification of arginine and lysineresidues important in catalytic activity. Journal of Biological Chemistry, 277(46), 43918-43923. https://doi.org/10.1074/jbc.m206429200
• Analysis of the Structure, Substrate Specificity, and Mechanism of Squash Glycerol-3-Phosphate (1)-Acyltransferase.
  
  Turnbull, A., Rafferty, J., Sedelnikova, S., Slabas, A., Scheirer, T., Kroon, J., Simon, J., Fawcett, T., Nishida, I., Murata, N., & Rice, D. (2001). Analysis of the Structure, Substrate Specificity, and Mechanism of Squash Glycerol-3-Phosphate (1)-Acyltransferase. Structure, 9(5), 347-353. https://doi.org/10.1016/s0969-2126%2801%2900595-0
• Crystallization and preliminary X-ray analysis of theglycerol-3-phosphate 1-acyltransferase from squash (Cucurbita moschata)
  
  Turnbull, A., Rafferty, J., Sedelnikova, S., Slabas, A., Schierer, T., Kroon, J., Nishida, J., Murata, N., Simon, J., & Rice, D. (2001). Crystallization and preliminary X-ray analysis of theglycerol-3-phosphate 1-acyltransferase from squash (Cucurbita moschata). Acta Crystallographica . Section D, Biological Crystallography, 57, 451-453. https://doi.org/10.1107/s0907444901000257
• Mutagenesis of squash (Cucurbita moschata) glycerol-3-phosphateacyltransferase (GPAT) to produce an enzyme with altered substrateselectivity
  
  Hayman, M. W., Fawcett, T., Schierer, T. F., Simon, J. W., Kroon, J. T. M., Gilroy, J. S., Rice, D. W., Rafferty, J., Turnbull, A. P., Sedelnikova, S. E., & Slabas, A. R. (2000). Mutagenesis of squash (Cucurbita moschata) glycerol-3-phosphateacyltransferase (GPAT) to produce an enzyme with altered substrateselectivity. Biochemical Society Transactions, 28, 680-681.
• Plant glycerol-3-phosphate-1-acyltransferase (GPAT): structure selectivity studies
  
  Slabas, A., Simon, W., Schierer, T., Kroon, J., Fawcett, T., Hayman, M., Gilroy, J., Nishida, I., Murata, N., Rafferty, J., Turnbull, A., & Rice, D. (2000). Plant glycerol-3-phosphate-1-acyltransferase (GPAT): structure selectivity studies. Biochemical Society Transactions, 28, 677-679.
• The X-ray structure of Brassica napus β-keto acyl carrier protein reductase and its implications for substrate binding and catalysis
  
  Fisher, M., Kroon, J. T., Martindale, W., Stuitje, A. R., Slabas, A. R., & Rafferty, J. B. (2000). The X-ray structure of Brassica napus β-keto acyl carrier protein reductase and its implications for substrate binding and catalysis. Structure, 8(4), 339-347. https://doi.org/10.1016/s0969-2126%2800%2900115-5
• The X-ray structure of Brassica napus beta-keto acyl carrier proteinreductase and its implications for substrate binding and catalysis
  
  Fisher, M., Kroon, J., Martindale, W., Stuitje, A., Slabas, A., & Rafferty, J. (2000). The X-ray structure of Brassica napus beta-keto acyl carrier proteinreductase and its implications for substrate binding and catalysis. Structure, 8(4), 339-347.
• A Consensus Sequence for Long-chain Fatty-acid Alcohol Oxidases from Candida Identifies a Family of Genes Involved in Lipid ω-Oxidation in Yeast with Homologues in Plants and Bacteria
  
  Vanhanen, S., West, M., Kroon, J. T., Lindner, N., Casey, J., Cheng, Q., Elborough, K. M., & Slabas, A. R. (2000). A Consensus Sequence for Long-chain Fatty-acid Alcohol Oxidases from Candida Identifies a Family of Genes Involved in Lipid ω-Oxidation in Yeast with Homologues in Plants and Bacteria. Journal of Biological Chemistry, 275(6), P4445-4452. https://doi.org/10.1074/jbc.275.6.4445
• Towards the genetic engineering of triacylglycerols of defined fatty acid composition: major changes in erucic acid content at the sn-2 position affected by the introduction of a 1-acyl-sn-glycerol-3-phosphate acyltransferase from Limnanthes douglasii into oil seed rape
  
  Brough, C. L., Coventry, J. M., Christie, W. W., Kroon, J. T., Brown, A. P., Barsby, T. L., & Slabas, A. R. (1996). Towards the genetic engineering of triacylglycerols of defined fatty acid composition: major changes in erucic acid content at the sn-2 position affected by the introduction of a 1-acyl-sn-glycerol-3-phosphate acyltransferase from Limnanthes douglasii into oil seed rape. Molecular Breeding, 2(2), 133-142. https://doi.org/10.1007/bf00441428
• Towards the genetic engineering of triacylglycerols of defined fatty acid composition: Major changes in erucic acid content at the sn-2position affected by the introduction of a1-acyl-sn-glycerol-3-phosphate acyltransferase from Limnanthesdouglasii into oi
  
  Brough, C., Coventry, J., Christie, W., Kroon, J., Brown, A., Barsby, T., & Slabas, A. (1996). Towards the genetic engineering of triacylglycerols of defined fatty acid composition: Major changes in erucic acid content at the sn-2position affected by the introduction of a1-acyl-sn-glycerol-3-phosphate acyltransferase from Limnanthesdouglasii into oi. Molecular Breeding, 2(2), 133-142.
• Identification of a cDNA that encodes a 1-acyl-sn-glycerol-3-phosphate acyltransferase from Limnanthes douglasii
  
  Brown, A. P., Brough, C. L., Kroon, J. T., & Slabas, A. R. (1995). Identification of a cDNA that encodes a 1-acyl-sn-glycerol-3-phosphate acyltransferase from Limnanthes douglasii. Plant Molecular Biology, 29(2), 267-278. https://doi.org/10.1007/bf00043651
• Identification of a cDNA that encodes a 1-acyl-sn-glycerol-3-phosphate acyltransferase from Limnanthes douglasii.
  
  Brown, A., Brough, C., KROON, J., & Slabas, A. (1995). Identification of a cDNA that encodes a 1-acyl-sn-glycerol-3-phosphate acyltransferase from Limnanthes douglasii. Plant Molecular Biology, 29(2), 267-278.
• Isolation of cDNAs from Brassica napus encoding the biotin-binding and transcarboxylase domains of acetyl-CoA carboxylase: assignment of the domain structure in a full-length Arabidopsis thaliana genomic clone.
  
  Elborough, K., Swinhoe, R., Winz, R., KROON, J., Farnsworth, L., Fawcett, T., Martinezrivas, J., & Slabas, A. (1994). Isolation of cDNAs from Brassica napus encoding the biotin-binding and transcarboxylase domains of acetyl-CoA carboxylase: assignment of the domain structure in a full-length Arabidopsis thaliana genomic clone. Biochemical Journal, 301(2), 599-605. https://doi.org/10.1042/bj3010599
• Cloning and structural analysis of the anthocyanin pigmentation locus Rt of Petunia hybrida: characterization of insertion sequences in two mutant alleles
  
  Kroon, J., Souer, E., de Graaff, A., Xue, Y., Mol, J., & Koes, R. (1994). Cloning and structural analysis of the anthocyanin pigmentation locus Rt of Petunia hybrida: characterization of insertion sequences in two mutant alleles. Plant Journal, 5(1). https://doi.org/10.1046/j.1365-313x.1994.5010069.x
• The petunia homologue of the Antirrhinum majus candi and Zea mays A2 flavonoid genes; homology to flavanone 3-hydroxylase and ethylene-forming enzyme
  
  Weiss, D., van der Luit, A. H., Kroon, J. T., Mol, J. N., & Kooter, J. M. (1993). The petunia homologue of the Antirrhinum majus candi and Zea mays A2 flavonoid genes; homology to flavanone 3-hydroxylase and ethylene-forming enzyme. Plant Molecular Biology, 22(5), 893-897. https://doi.org/10.1007/bf00027374
• Paralogues of the PXY and ER receptor kinases enforce radial patterning in plant vascular tissue
  
  Wang, N., Bagdassarian, K. S., Doherty, R. E., Wang, X. Y., Kroon, J. T., Wang, W., Jermyn, I. H., Turner, S. R., & Etchells, J. P. (n.d.). Paralogues of the PXY and ER receptor kinases enforce radial patterning in plant vascular tissue. BioRxiv (Preprint Server for Biology) [Submitted].