Scientist - Protein Engineering

SoseiHeptares Great Abington United Kingdom Biotech Hybrid
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Company Description

Sosei Heptares (the corporate brand of Sosei Group Corporation) is a research-focused biotechnology group, publicly listed in Japan (TSE: 4565) and with sites in Tokyo, London and Cambridge (UK).

Our mission is to make a significant contribution to improving the quality of life and health of people around the world. To achieve this, we will discover, design and develop the most innovative and effective medicines for patients worldwide, through our world-leading patent-protected StaR® technology and platform.

Our primary focus is the discovery and early development of new medicines originating from our proprietary G Protein-Coupled Receptor (GPCR)-targeted StaR® technology and Structure-Based Drug Design (SBDD) platform capabilities. We are advancing a broad and deep pipeline of novel medicines across multiple therapeutic areas, including CNS, immuno-oncology, gastroenterology, inflammation and other rare/specialty indications.

We have established partnerships with some of the world’s leading pharmaceutical companies, including Abbvie, AstraZeneca, Genentech (Roche), Novartis, Pfizer and Takeda; and additionally, with multiple emerging biotechnology companies.

Sosei Heptares has approximately 145 employees based at its new R&D research facility at Granta Park. The size of the company ensures a transparent linkage between all activities from early discovery through to clinical development


We are currently seeking a molecular biologist to join the Protein Engineering group working on GPCR structure determination to enable drug discovery efforts.

The successful candidate will undertake the following responsibilities:

  • Cloning of plasmid constructs for expression;
  • Expression of GPCRs in insect, yeast and human cells;
  • Characterization of GPCRs in membranes and in detergent-solubilised form using ligand binding assays;
  • Establishing and optimising thermal stability assays;
  • Mutant library generation and directed evolution of proteins;
  • Screening for stabilising mutations using our proprietary platform to create StaR® proteins;
  • Construct engineering to optimise expression;
  • Purification and biochemical characterisation of GPCRs using a range of techniques such as size exclusion chromatography;
  • Optimising expression of other membrane proteins (e.g., ion channels and transporters)
  • Careful documentation of experimental work; and,
  • Work closely with molecular biologists, protein expression scientists, biophysicists, structural biologists, and pharmacologists to help advance the project.

This is an exceptional opportunity to participate in pioneering science with an Industry-leading Drug Discovery company.


Our preferred candidate will have the following profile:

  • BSc or MSc in a relevant area of biology
  • Ability to work flexibly within a team, whilst being highly self-motivated and able to work independently;
  • Analytical thinking and good problem-solving skills;
  • Excellent organisational and time-management skills, including the ability to work to strict deadlines;
  • Fluency in oral and written English is essential; and
  • Relevant lab experience would be preferred including:
  • Experience in cloning techniques;
  • Proficient in cell culture techniques for the expression of proteins in mammalian, insect or yeast cells;
  • Experience in protein purification;
  • Experience of assay development and optimisation;
  • Experience in flow cytometry;
  • Experience in GPCR in vitro pharmacology and GPCR biochemical assays would be desirable.

Other information

Other information

Applicants must be able to demonstrate proof of the right to work in the United Kingdom.

The successful candidate will be employed by Heptares Therapeutics Ltd, a UK wholly owned subsidiary of Sosei Group Corporation.

We offer a competitive salary, commensurate with qualifications and experience, and benefits package including pension and healthcare schemes.

Applications should include a covering letter, providing a short description of the background to their interest in the role, with curriculum vitae including the names and contact details for two referees. Please apply through our on-line jobs portal with your application in pdf format, quoting reference number 2023-SciProEng.

The closing date for applications is 28th February 2023

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