Summary

Rhamnolipids have been identified as microbial biosurfactants with huge potential for industrial exploitation, however, the best known producer, Pseudomonas aeruginosa is a human pathogen and therefore unacceptable as an industrial organism. A number of other non-pathogenic bacterial producers of rhamnolipid have been identified and these are currently being intensively researched.  All these bacteria yield a mixture of mono-rhamnolipids and di-rhamnolipids in different proportions since the mono form provides the substrate for a second rhamnosyltransferase to add the second sugar molecule to produce the di form.

It is this second rhamnosyltransferase that will form the focus for this project since it controls the proportion of mono to di-rhamnolipid in the final product. The approach in this project will be to use our existing knowledge of the gene sequences of this enzyme from different organisms to give heterologous expression in E.coli  of a his-tagged protein which can then be purified. Having a purified enzyme will allow protein sequencing to be carried out by mass spectrometry and the development of a cell free enzyme assay to determine the kinetics of each of the rhamnosyltransferases.

Applicants should note that Bench fees of £2000.00 are required.

Related references:

V. U. Irorere, L. Tripathi, R. Marchant, S. McClean and I. M. Banat (2017). Microbial Rhamnolipid Production: A Critical Re-evaluation of Published Data and Suggested Future Publication Criteria. Applied Microbiology & Biotechnology. 101:3941–3951.   DOI 10.1007/s00253-017-8262-0

Dulcey, Carlos Eduardo; de los Santos, Yossef Lopez); Deziel, Eric ; Doucet, Nicolas. (2017). Semi-rational evolution of the Pseudomonas aeruginosa Rhamnosyltransferase 1 subunit A (RhlA) for the synthesis of industrially relevant rhamnolipids. Protein Science,  26:  68-68.


Essential criteria

  • To hold, or expect to achieve by 15 August, an Upper Second Class Honours (2:1) Degree or equivalent from a UK institution (or overseas award deemed to be equivalent via UK NARIC) in a related or cognate field.

Funding

This is a self-funded PhD opportunity.


Other information


The Doctoral College at Ulster University


Reviews

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Kamin Hau - PhD in Biomedical Sciences


Profile picture of Kieran O'Donnell

My experience has been great and the people that I have worked with have been amazing

Kieran O'Donnell - 3D printing of biological cells for tissue engineering applications

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Profile picture of Michelle Clements Clements

Completing the MRes provided me with a lot of different skills, particularly in research methods and lab skills.

Michelle Clements Clements - MRes - Life and Health Sciences

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Profile picture of Sarah Craig

I completed my undergraduate studies at Ulster University, where I graduated in 2017 with first class honours in Biomedical Science with a Diploma in Professional Practice . I joined the Diabetes Research group as a PhD researcher in September 2017 and completed my PhD studies in June 2020.I am proud to say I not only completed my PhD studies within 3 years, but also became the World Champion (with a perfect score!) in Irish Dance during my PhD studies. My favourite memory was the opportunity to present my PhD work at the EASD conference in 2019. If I could speak to myself at the start of my PhD, the best piece of advice I would give myself would be to enjoy every single minute as the time flies in. I really would do another PhD!

Sarah Craig - PhD in Biomedical Sciences


Profile picture of Natalie Klempel

I completed my undergraduate studies in America at Texas Woman’s University where I majored in Kinesiology. I then moved to Scotland to successfully complete my Masters with Merit in Human Anatomy at the University of Dundee.My proudest moment was when I passed my viva! My favourite memory was …the dissections. I’ll never forget the friends I made and the good times we had together. I couldn’t have got through this without the support of my family, friends, lab colleagues, supervisors, and my boyfriend. If I could speak to myself at the start of my PhD, the best piece of advice I would give myself would be to write up after every experiment, keep a lot of back up copies of the work, and to enjoy the experience.

Natalie Klempel - PhD in Biomedical Sciences


Profile picture of Poonam Singh Nigam

I joined Ulster university in Jan 1990 after completing Postdoctoral research in Germany (1986-88) and PhD in India (1985). DSc degree in Applied Microbial-Biotechnology has been awarded after the evaluation of my thesis based on Research, Publication & related activities, completed as a research-active academic member of staff (1990-2019). DSc thesis summarised my scientific outputs and contributions (183 research papers, 3 biotechnology reference-books, 43 research-informed book-chapters, 26 research-informed review-articles, 90 conference-abstracts,1 European Patent and 2 Technology-transfers; Supervision of National & International researchers-18 Postdoctoral/Exchange and 12 PhD; and affiliations as Examiner of 58 PhD researchers globally, and Fellow & Member of nine scientific & academic societies.My message to all researchers is that "Chase your Aspirations and Never Give up". I couldn’t have got through my long academic & Professional journey without

Poonam Singh Nigam - DSc in Biomedical Sciences


Profile picture of Karl Smith

I started my PhD after I completed my undergraduate in Biology at Ulster University in 2016, with a dissertation project that focused on genetic variations in bacterial species. I continued using some of these techniques in my doctoral research, which primarily involved the investigation and development of mass spectrometry imaging in vitamin D treated prostate cancer, looking at the metabolic and genetic variations upon treatment. I worked with international collaborators at the University of Edinburgh and Maastricht University, where I got to learn and develop mass spectrometry techniques that have not previously been carried out in Northern Ireland. I now work as a postdoctoral researcher at the National High Magnetic Field Laboratory at Florida State University in Tallahassee, Florida, where I am helping to develop and implement a mass spectrometry imaging facility for users across the world with the super powerful 21T FT-ICR mass spectrometer.A PhD is a demanding process but when

Karl Smith - PhD in Biomedical Sciences


Profile picture of William Crowe

Throughout my PhD I’ve been provided with continuous support and guidance by my supervisors and the staff at the University.I’ve also received many opportunities to further enhance my professional development in the form of teaching experience and presenting my work at conferences which will aid in my pursuit of a career in academia or industry.

William Crowe


Profile picture of Ryan Kelsey

I graduated Ulster University in 2016 with a degree in Biomedical Science with DPP (Pathology). I was then offered a PhD studentship with Dr Catriona Kelly and Professor Neville McClenaghan at CTRIC which I started in September 2016. My PhD explored the pathophysiology of Cystic Fibrosis-Related Diabetes, the most common co-morbidity associated with Cystic Fibrosis.My proudest moment was undoubtedly passing my Viva (via Skype!), but I was also proud to be given the opportunity to present my work at the UK Cystic Fibrosis Trust Conference in 2018. Through this conference, I was able to meet with people with CF and the challenges they face which was important reminder that the research I was doing mattered. I couldn't have got through this without the unwavering support of my family, who were always there for me in the good times and the bad. I am also extremely grateful for the support and mentorship of my supervisors Dr Catriona Kelly, Professor Neville McClenaghan and Dr Dawood Khan

Ryan Kelsey - PhD in Biomedical Sciences


Profile picture of Ahmed Abuelhana

My proudest moment was when I knew the possibility of the full transfer of my PhD project to Ulster University, the University which I loved and started my first steps towards my PhD in, and also being a PhD graduate from one of the highly reputable universities such as Ulster is a big thing which I should always be proud of. I think there is no that word that can ever express my deepest thanks and sincere appreciation to my supervisor Professor Kathryn Burnett for her ideal supervision, valuable guidance, encouragement, generous help and ultimate support throughout my PhD project. I have been really lucky to have her as a supervisor. Also my deepest gratitude to Mr Linden Ashfield, Principal Clinical Pharmacist, Antrim Area Hospital (NHSCT) for his help and endless support throughout the whole research project. Also, I could not have got through this without the support of my beloved family (my father ”Sayed”, my mother ”Gamila”, my wife “Nermeen”

Ahmed Abuelhana - PhD in Biomedical Sciences


Profile picture of Ryan Lafferty

I graduated from Queen's University Belfast with a Master's in pharmacy in 2014 and subsequently began working as a community pharmacist in the Greater Belfast area. My career began to take an unusual turn when I got involved with a small startup company who developed a novel blood glucose monitor for diabetic patients. From here, my interest in diabetes was piqued and I applied for a PhD project (somewhat optimistically!) in the Diabetes Research Group at Ulster. Nearly four years later, I'm still there working as a postdoctoral researcher. Not bad considering I never thought I had a chance of getting a PhD spot!My time within the DRG has been, and still is, fantastic. I've made life-long friends (and surprisingly few enemies!) who have been patient, helpful and a joy to collaborate with. I couldn't have got through it without them (you know who you are). Likewise, the guidance from my supervisors, Prof. Peter Flatt and Dr. Nigel Irwin, has been invaluable. I'm probably most proud of

Ryan Lafferty - PhD in Biomedical Sciences