Following his PhD, Winter completed postdoctoral research at the Laboratory of Molecular Biology in Cambridge. He continued to specialise in protein and nucleic acid sequencing and became a Group Leader at the MRC Laboratory of Molecular Biology in 1981. He became interested in the idea that all antibodies have the same basic structure, with only small changes making them specific for one target. Georges Köhler and César Milstein had won the 1984 Nobel Prize for their work at the Laboratory of Molecular Biology, in discovering a method to isolate and reproduce individual, or monoclonal, antibodies from among the multitude of different antibody proteins that the immune system makes to seek and destroy foreign invaders attacking the body. However, these monoclonal antibodies had limited application in human medicine, because mouse monoclonal antibodies are rapidly inactivated by the human immune response, which prevents them from providing long-term benefits. Winter then pioneered a technique to "humanise" mouse monoclonal antibodies; a technique that was used in the development of Campath-1H by the Laboratory of Molecular Biology and University of Cambridge scientists. This antibody now looks promising for the treatment of multiple sclerosis. Humanised monoclonal antibodies form the majority of antibody-based drugs on the market today and include several blockbuster antibodies, such as Keytruda, which works with your immune system to help fight certain cancers. Winter founded Cambridge Antibody Technology in 1989, and Bicycle Therapeutics. He worked on the Scientific Advisory Board of Covagen, and is also the chairman of the Scientific Advisory Board for Biosceptre International Limited. In 1989, Winter was a founder of Cambridge Antibody Technology, one of the early commercial biotech companies involved in antibody engineering. One of the most successful antibody drugs developed was HUMIRA, which was discovered by Cambridge Antibody Technology as D2E7, and developed and marketed by Abbott Laboratories. HUMIRA, an antibody to TNF alpha, was the world's first fully human antibody, which went on to become the world's top selling pharmaceutical with sales of over $18Bn in 2017 Cambridge Antibody Technology was acquired by AstraZeneca in 2006 for £702m. In 2000, Winter founded Domantis to pioneer the use of domain antibodies, which use only the active portion of a full-sized antibody. Domantis was acquired by the pharmaceutical GlaxoSmithKline in December 2006 for £230 million. Winter subsequently founded another company, Bicycle Therapeutics Limited as a start up company which is developing very small protein mimics based on a covalently bonded hydrophobic core.
Awards and honours
Winter was elected a Fellow of the Royal Society in 1990 and awarded the Royal Medal by the society in 2011 "for his pioneering work in protein engineering and therapeutic monoclonal antibodies, and his contributions as an inventor and entrepreneur". He was given the Scheele Award in 1994. In 1995, Winter won several international awards including the King Faisal International Prize for Medicine and in 1999, the Cancer Research Institute William B. Coley Award. Winter was formerly the Joint Head of the Division of Protein and Nucleic acid Chemistry-Biotechnology, and is Deputy Director, at the Laboratory of Molecular Biology, Cambridge, an institution funded by the UK Medical Research Council. He was also Deputy Director of the MRC's Centre for Protein Engineering until its absorption into the Laboratory of Molecular Biology. He is a member of the Advisory Council for the Campaign for Science and Engineering. Winter was appointed Commander of the Order of the British Empire in 1997 and Knight Bachelor in 2004. He served as Master of Trinity College, Cambridge from 2012 to 2019. In 2015 he received the Wilhelm Exner Medal. Winter was awarded the Nobel Prize in Chemistry on 3 October 2018 for his work on phage displays for antibodies, along with George Smith and Frances Arnold. In 2020 he was featured on The Times' 'Science Power List'.