Professor Marshall Stark
- Professor of Molecular Genetics (Molecular Biosciences)
telephone:
01413305116
email:
Marshall.Stark@glasgow.ac.uk
R504c Level 5, Institute of MC&SB, Bower Building, Glasgow G12 8QQ
Biography
My first degree was in Chemistry (Glasgow University, 1980). For my Ph.D I studied the biosynthetic pathway to a group of fungal antibiotics (also in the Chemistry Department in Glasgow). Following a post-doc in Cambridge (studying the biosynthesis of porphyrins) and a spell in industry (ICI/Zeneca, Manchester, working on synthesis of specialized organic light-absorbing compounds), I returned to Glasgow and a post-doc in the Genetics Department with Prof. David Sherratt. My project aimed to understand the mechanism of the site-specific recombination system of the bacterial penicillin resistance transposon Tn3. In 1999 I was fortunate to be awarded a Royal Society University Research Fellowship, which funded me for the next 10 years and gave me the freedom and resources to continue my site-specific recombination research independently. When my Fellowship ended I was appointed as a Reader here and was subsequently made Professor of Molecular Genetics. My research group and I continue to study DNA site-specific recombination. We are interested in the structures and molecular mechanisms of the recombinases (the enzymes that catalyse recombination), and how these remarkable enzymes can be used as tools for editing DNA sequences for biotechnology, synthetic biology and gene therapy.
Research interests
Mechanisms, structures and applications of site-specific recombination
We study enzymes that can rearrange the structure of DNA molecules. Site-specific recombinases break both strands of a DNA molecule at two defined points, and rejoin the four ends of the double helix in a new arrangement. For example, Tn3 resolvase is a small protein (20 kDa), yet it can promote complete site-specific recombination (recognizing the two sites, bringing them together, breaking the four DNA strands, rearranging the ends, and rejoining them to new partners).
We are studying the reactions of resolvase and other recombinases in vitro, using innovative techniques, and interpreting our results in the context of crystal structures of complexes of the recombinases with DNA. We aim to develop a detailed picture of the structures and mechanisms involved in the site-specific recombination process and its regulation.
Site-specific recombination reactions are excellent model systems for studying the properties and functions of proteins that bind to and act on DNA. In the course of our work, we are gaining insight into the behaviour of the DNA molecule itself, and how proteins deal with it. We are also working on ways of developing these biological systems as potentially very useful tools for Synthetic Biology, Biotechnology and gene therapy.
Current PhD students
Rich Clubbe - Serine Integrase-based "landing pad" systems for chromosomal Integrations of heterologous genes.
Jumai Abioye - Designer recombinases targeting the HIV provirus.
Research groups
Grants
Grants and Awards listed are those received whilst working with the University of Glasgow.
- The directionality mechanism of DNA site-specific recombination by serine integrases
Biotechnology and Biological Sciences Research Council
2022 - 2025
- Elucidation of the rotary mechanism of serine recombinases
Biotechnology and Biological Sciences Research Council
2018 - 2021
- A platform for rapid and precise DNA module rearrangements in Synthetic Biology
Biotechnology and Biological Sciences Research Council
2012 - 2018
- Chimaeric site-specific recombinases for 'genomic surgery'
Biotechnology and Biological Sciences Research Council
2008 - 2011
- Regulation of catalysis in the resolvase synaptosome
Wellcome Trust
2008 - 2010
- The mechanism of DNA strand exchange by serine recombinases
Biotechnology and Biological Sciences Research Council
2007 - 2010
- Recombinase-mediated site-specific gene integration in mammalian somatic cells
Biotechnology and Biological Sciences Research Council
2005 - 2008
- Site-specific recombination by resolvase - assembly and activation of the catalytic tetramer
Wellcome Trust
2003 - 2006
Supervision
Projects for postgraduate students are available in any of the following areas:
- We are investigating the very unusual “subunit rotation” mechanism of the serine recombinases, which is not yet properly understood. We are using state-of-the-art single-molecule fluorescence methods to observe individual DNA-recombinase complexes in real time as they undergo recombination, aiming to understand the mechanism in detail.
- We are studying one group of recombinases called the serine integrases, whose properties make them especially suitable as tools for Synthetic Biology. We wish to understand how they catalyse recombination and how they can be engineered to optimize their performance as gene-editing enzymes.
- By splicing together parts of serine recombinases with zinc finger or TALE DNA-binding domains we have created “zinc finger recombinases” (ZFRs) and “TALE recombinases” (TALERs) that can be targeted to specific chosen sequences (for example, target sequences in cellular genomic DNA). Using these enzymes we can integrate transgenic DNA sequences at a specific genetic locus, or delete specific sequences from the genome. We aim to optimize the efficiency and specificity of these ZFRs and TALERs so as to make them useful gene editing tools.
Recently completed PhD students/projects in my lab:
Hayley Macfarlane (2017) - Engineering site-specific recombinases for use in Synthetic Biology.
Jeffrey Kentner (2015) - Engineering zinc finger recombinases for use in targeted genomic editing.
Stephanie Holt (2014) - Target site recognition by Tn3 and Sin resolvases.
Jan-Gero Schloetel (2011) - Single-molecule FRET studies of the mechanism of strand exchange in site-specific recombination by Tn3 resolvase.
Teaching
- Postgraduate Research Convenor for IMCSB
- L4 DNA Option: Course coordinator
- L4 Tutorials: for Genetics, MCB, and Biochemistry students
- L3 Genetics: lectures on recombination
- L3 Genetics/MCB/Biotechnology: lectures on Mobile DNA
Research datasets
Additional information
Editorial Board
- 2007 - present: Biochemical Journal - Editor
Grant Advisory Board
- 2011 - present: BBSRC - Pool of Experts Panel D
Invited International Presentations
- 2010: Montreal, Canada - ASM conference: Mobile DNA
- 2010: Oleron, France - Site-specific recombination conference
- 2010: Sheffield, UK - NACON VIII conference
- 2009: Cambridge, UK - Meeting organizer and Session Chair: International meeting "Machines on Genes" (sponsored by Biochemical Society)
- 2008: Chicago, USA - University of Chicago - Z-resolvases: Tools for genomic surgery"
- 2008: Sussex, UK - University of Sussex - "Resolvase: How to switch it on?"
- 2008: Cambridge, UK - University of Cambridge - "Resolvase: How to switch it on?"
- 2008: Wood's Hole, USA - International meeting
- 2006: Warwick University, Warwick, UK - Co-organizer and session Chair of international conference: “Meiosis and the causes and consequences of recombination” (sponsored by Genetics Society/Biochemical Society)
- 2004: Wood's Hole, USA - Site-specific recombination meeting
- 2004: Roscoff, France - EMBO Transposition meeting
- 2003: Glasgow, UK - Tenovus Symposium, 'Eukaryotic Gene Expression' Session Chair
- 2003: University College London, UK
- 2002: Oxford, UK. - 2002 Workshop on site-specific recombination and transposition.
Professional Learned Society
- 2007 - present: Genetics Society - Member
- 2004 - 2009: Biochemical Society - Member of 'Genes' Theme Panel from 2005
Research Fellowship
- 1989 - 1999: Royal Society University Research Fellowship