Innovating Protein Biochemistry into Biotechnology (Spring 2022)
Graduate Student Position Available
Queen’s University / National Research Council – Ottawa
Supervisors: Dr. Michele Loewen & Dr. John Allingham
Start Date: May 2016 or sooner if possible.
Please visit our Jobs page for more information: Loewen Lab Jobs
Interested individuals should contact Dr. Michele Loewen as soon as possible at: michele.loewen@queensu.ca
The lab is pleased to welcome two new members including, Mr James Wells and Dr. Zerihun Demissie. James is co-op student joining us from the Queen’s University Biochemistry Coo-op Program. He is undertaking an 8 month term with us working on enzymes involved in carotenoid metabolism in wheat kernels. Ze joins us having recently completed his PhD in Plant Molecular Biology and Biochemistry at UBC-Okanagan with Dr. Solheil Mahmoud, and a short post-doctoral stint at Brock University with Dr. Vince DeLuca. Ze will be working on projects focused on hormone signalling and ABC transporter targets as they relate to the development of resistance to the wheat fungal pathogen, Fusarium Head Blight.
Please visit our Publications Page for details:
Choudhary, P., & Loewen, M.C., (2015) Cell Biol. Int. Aug 27. doi: 10.1002/cbin.10541. [Epub ahead of print].
Choudhary, P., & Loewen, M.C. (2015) J Biochem. 2015 Jul 30. pii: mvv072. [Epub ahead of print].
Galka MM, Rajagopalan N, Buhrow LM, Nelson KM, Switala J, Cutler AJ, Palmer DR, Loewen PC, Abrams SR, Loewen MC. (2015) PLoS One. 2015 Jul 21;10(7):e0133033. doi: 10.1371/journal.pone.0133033.
Pydi, S.P., Sobotkiewca, T., Bilakanti, R., Bhullar, R.P., Loewen, M.C., Chelikani, P., (2014) J. Biol. Chem. 289:25054-25066.
This work represents a comparative computational analysis of the dynamics of the interactions between abscisic acid receptors and their downstream signalling target, Type2 protein phosphatases. In particular the effect of sets of mutations on the basal or constitutive activity of the receptors is considered.
This work reposents a caollabortive effort between the labs of Dr. Grill in Germany and Dr. Abrams and Loewen in Canada. In this work we have carried out a structure activity study of a selection of analogs of abscisic acid, looking at both in vitro characteristics by enzymatic assay and isothermal titration calorimietry, and physiological effect on germination, root growth and stomatal aperture. Together the results highlight the selectivity and specificity of select analogs in physiological functions and for differentiating the functionalities of the broader family of abscisic acid receptors.
Olesya A. Kharenko; Devin Polichuk; Ken M. Nelson; Suzanne R. Abrams; Michele C. Loewen (2013) Identification and characterization of interactions between abscisic acid and human heat shock protein 70 family members J Biochem 154:383-391 [PDF]
This work represents a twist in our chemical proteomics strategy, having here applied it not to plant target tissues, but to human cell extracts. ABA is well known to have positive beneficial effects on human health, but the primary targets of ABA in mediating its effects remain enigmatic. Here we present evidence of an interaction between ABA and a heatshock protein, glucose responsive protein 78, involved in a variety of human conditions including diabetes and immunological responses and cancer.
We recently deposited a new structure for Pisum sativum (a.k.a. garden pea) rubisco bound to its substrate ribulose 1,5-bisphosphate and abscisic acid. The structure can be accessed through the RCSB database under PDBID 4MKV.
The lab is pleased to welcome Mr. Enwu Liu and Dr. Shawn Clark. They join us from the lab of Dr. Jon Page here at NRC. Both Shawn and Enwu have been working for more than a year now as part of the Canadian Wheat Alliance (CWA), Enhanced Fusarium and Rust Tolerance project. They are interested in the application of viral induced gene silencing (VIGS) to the breeding of more disease resistance wheat. Now in joining the group they will continue investigating in this area through collaborations with members of the Loewen group, NRC and within the CWA more broadly.
This work demonstrates that the phytohormone abscisic acid binds to a recombinant form of the GTG1 protein, both in intact yeast cell membranes and to affinity enriched GTG1 protein, insupport of the GTG1 protein being an abscisic acid binding protein.
This work represents a comparitive computational analysis of the dynamics of the interactions between homodimerized and monomeric abscisic acid receptors and their ligand, the phytohormone abscisic acid.
