# Keith R. Willison
**Keith Robert Willison** (born 1953) is a molecular biologist who holds the Chair in Chemical Biology in the Department of Chemistry at [Imperial College London](https://www.edgepedia.org/imperial-college-london), where he has been Professor of Chemical Biology since 1 March 2012.[1](https://profiles.imperial.ac.uk/keith.willison) • [2](https://doi.org/10.1093/ww/9780199540884.013.42214) He is known for two connected lines of work: the genetics of the mouse t haplotype, a variant chromosome region on mouse chromosome 17, and, according to a UK-centric history of studies on the mouse t-complex, the discovery and characterization of the chaperonin containing TCP-1 (CCT, also called TRiC), the eukaryotic cytosolic machine that folds the cytoskeletal proteins actin and tubulin.[3](https://www.cell.com/cell/abstract/0092-8674(86)90839-1) • [4](https://cshmonographs.org/index.php/monographs/article/view/4898/0)
| Fact | Detail |
|---|---|
| Born | 1953[2](https://doi.org/10.1093/ww/9780199540884.013.42214) |
| Field | Molecular biology; protein folding, chemical biology[2](https://doi.org/10.1093/ww/9780199540884.013.42214) • [1](https://profiles.imperial.ac.uk/keith.willison) |
| Current post | Chair in Chemical Biology, Imperial College London, since 1 March 2012[1](https://profiles.imperial.ac.uk/keith.willison) |
| Training | BSc Biochemistry, Sussex (1972–1975); PhD Biochemistry, Cambridge (1975–1978); postdoctoral fellow in virology, Cold Spring Harbor Laboratory (1979–1981)[1](https://profiles.imperial.ac.uk/keith.willison) |
| Signature work | Cloning of the mouse Tcp-1 gene (Cell, 1986); definition of TCP-1 as a subunit of the CCT chaperonin (Nature, 1991)[3](https://www.cell.com/cell/abstract/0092-8674(86)90839-1) • [5](https://www.nature.com/articles/358249a0) |
| Main affiliation before Imperial | Institute of Cancer Research (ICR), 1981–2011[1](https://profiles.imperial.ac.uk/keith.willison) |
## Education and early career
Willison took his BSc Hons in [Biochemistry](https://www.edgepedia.org/biochemistry) at the [University of Sussex](https://www.edgepedia.org/university-of-sussex) from 1 October 1972 to 1 July 1975, and his PhD in Biochemistry at the [University of Cambridge](https://www.edgepedia.org/university-of-cambridge) from 1 October 1975 to 30 September 1978.[1](https://profiles.imperial.ac.uk/keith.willison) He then spent about two years and eight months as a Postdoctoral Fellow in Virology at Cold Spring Harbor Laboratory in the United States, from 1 January 1979 to 31 August 1981.[1](https://profiles.imperial.ac.uk/keith.willison)
## Career
He joined the Institute of Cancer Research (ICR) as [Scientist](https://www.edgepedia.org/scientist) and Team Leader in the Section of Cell and Molecular Biology on 1 September 1981 and remained there until 31 August 2011.[1](https://profiles.imperial.ac.uk/keith.willison) From 1 January 1996 to 30 April 2005 he was Head of Chester Beatty Laboratories at the ICR in London.[1](https://profiles.imperial.ac.uk/keith.willison) He describes his three decades at the ICR as the period in which he pioneered the genetics and biochemical analysis of the CCT system.[6](https://hstalks.com/t/341/chaperonin-containing-tcp-1-cct-actin-springs-and-/)
On 1 March 2012 he took up his Chair in Chemical Biology in Imperial College London's Department of Chemistry, where he remains.[1](https://profiles.imperial.ac.uk/keith.willison) Between the two posts he was Weston Visiting Professor in Structural Biology at the [Weizmann Institute of Science](https://www.edgepedia.org/weizmann-institute-of-science) in Rehovot, Israel, from 1 October 2011 to 31 August 2012, and he has been a Special Visiting Professor in Cell Biology at Tokyo Institute of Technology under the Top Global Universities Program since 20 October 2017.[1](https://profiles.imperial.ac.uk/keith.willison)
## Representative work
Willison's 1983 Nature paper reported a major rearrangement in the H–2 major histocompatibility complex of mouse t haplotypes, published on 1 August 1983.[7](https://doi.org/10.1038/304549a0) The t haplotype is a variant chromosome region on mouse chromosome 17.[4](https://cshmonographs.org/index.php/monographs/article/view/4898/0)
His 1986 Cell paper cloned the gene for t complex polypeptide 1 (TCP-1), an abundant testicular germ-cell protein that has a variant form, TCP-1A, in t haplotypes.[3](https://www.cell.com/cell/abstract/0092-8674(86)90839-1) The cDNA clone pB1.4 hybridizes to a 19S mRNA abundant in haploid cells during mouse spermatogenesis, and a Taq1 restriction fragment length polymorphism created by a T-to-C transition allowed typing of the Tcp-1 gene cluster in 40+ complete and partial t haplotype chromosomes.[3](https://www.cell.com/cell/abstract/0092-8674(86)90839-1) DNA sequence comparison of the Tcp-1 genes suggested that the t haplotype chromosome arose within the genus *Mus* more than one million years ago.[3](https://www.cell.com/cell/abstract/0092-8674(86)90839-1)
The 1989 Cell paper, published in May 1989, showed that TCP-1 is associated with the cytoplasmic aspect of Golgi membranes.[8](https://doi.org/10.1016/0092-8674(89)90131-1) TCP-1 then turned out to be one subunit of a much larger machine. In a 1991 Nature paper from the ICR's Chester Beatty Laboratories, Willison's group reported that native murine and human [TCP1](https://www.edgepedia.org/tcp1) is distributed throughout the cytosol as an 800K–950K hetero-oligomeric particle associated with four to six unidentified proteins and two Hsp70 heat-shock proteins; negative-stain electron microscopy showed two stacked rings 12–16 nm in diameter.[5](https://www.nature.com/articles/358249a0) Using monoclonal antibodies raised against TCP-1, the group purified the protein biochemically, initially from testis, and found it to be a subunit of a large heteromeric complex with many properties in common with *E. coli* GroEL.[9](https://doi.org/10.1387/ijdb.10761848) A Cold Spring Harbor monograph records that the discovery of CCT arose from three independent lines of investigation, one of them Willison's laboratory's work on the mouse Tcp-1 gene, which maps to the t-complex region of chromosome 17 and is up-regulated during spermatogenesis; the group cloned mouse and human TCP1 cDNAs and genes, made seven monoclonal antibodies to the protein, and biochemically purified the chaperonin.[4](https://cshmonographs.org/index.php/monographs/article/view/4898/0)
## What CCT does
The chaperonin containing TCP-1 is present in the cytosol of all eukaryotes and folds newly synthesized actins and tubulins through ATP-dependent release of folding intermediates.[9](https://doi.org/10.1387/ijdb.10761848) Independent work in Chinese hamster ovary cells showed that newly synthesized alpha-tubulin, beta-tubulin, and actin enter a complex of approximately 900 kDa that coelutes with TCP1 and can be immunoprecipitated with anti-TCP1 antibody, demonstrating a cytosolic pathway for folding tubulin and actin in vivo.[10](https://pmc.ncbi.nlm.nih.gov/articles/PMC47580/) Willison's group isolated the mouse genes for the eight subunits of CCT, orthologous to yeast CCT1–CCT8, and developed a model for the subunit arrangement within a ring; the assembled complex is 950 kDa, two back-to-back rings of eight subunits each.[9](https://doi.org/10.1387/ijdb.10761848)
In his 2018 Biochemical Journal review, Willison described actin folding by CCT as a sequential allosteric mechanism in which non-native actin is annealed through sequential binding and hydrolysis of ATP around the double-ring ATPase built from the eight related subunits CCT1–CCT8. CCT releases a folded but soft ATP-G-actin monomer trapped about 80 kJ/mol uphill on the folding energy surface by its ATP-Mg2+/Ca2+ clasp, and the review traces the origin of the CCT–actin system to the last eukaryotic common ancestor, where it may have facilitated phagocytosis during early eukaryotic evolution.[11](https://doi.org/10.1042/bcj20170378) He has consistently maintained that the main function of the CCT assembly is to fold actin and tubulin, with other functions ancillary; unlike bacterial GroEL, it is a specific machine for folding a relatively small number of proteins.[6](https://hstalks.com/t/341/chaperonin-containing-tcp-1-cct-actin-springs-and-/)
## Later research and single-molecule work
Since moving to Imperial, his group's research has covered eukaryotic protein folding and single-molecule approaches to protein dynamics and protein counting, in interdisciplinary collaboration across the college.[1](https://profiles.imperial.ac.uk/keith.willison) Imperial's Molecular Dynamics Group has collaborated with Willison's Protein Folding and Assembly Team at the ICR on protein-protein interaction networks relevant to cancer research, using physical chemistry and optical spectroscopy.[12](https://www.ch.ic.ac.uk/klug/Research/SingleMolec/ResearchSMol.html) In 2006 he was a co-holder of a £5 million grant from the EPSRC and BBSRC, running five and a half years, to support the Single Cell Proteomics group at Imperial; he said at the time that new single-cell, single-molecule approaches are vital in the hunt for rare cancer cells.[13](https://www.icr.ac.uk/about-us/icr-news/detail/working-to-identify-proteins-inside-cells)
A 2025 Nature paper on single-molecule dynamics of the TRiC (CCT) chaperonin system in vivo reported single-particle tracking in human cells of TRiC and its co-chaperone [prefoldin](https://www.edgepedia.org/prefoldin). Both chaperones engaged nascent polypeptides repeatedly in brief probing events typically lasting around one second, with prefoldin recruiting TRiC; near translation termination, prefoldin bound for several seconds, facilitating TRiC recruitment for post-translational folding in multiple reaction cycles of around 2.5 seconds, and TRiC often remained confined near its client in a localized "protective zone" in which free diffusion is restricted.[14](https://www.nature.com/articles/s41586-025-10073-3)
## Funding and training
Willison was a founder member of the EPSRC-funded Centre for Doctoral Training in Chemical Biology, which started in 2003, was renewed for a fifth student intake for 2024–2029, and trained over 250 PhDs across its first four programs.[1](https://profiles.imperial.ac.uk/keith.willison)
## References
1. [Professor Keith Willison | Imperial College London](https://profiles.imperial.ac.uk/keith.willison)
2. [Willison, Prof. Keith Robert (Who's Who, Oxford University Press)](https://doi.org/10.1093/ww/9780199540884.013.42214)
3. https://www.cell.com/cell/abstract/0092-8674(86)90839-1
4. [The Structure, Function, and Genetics of the Chaperonin Containing TCP-1 (CCT) in Eukaryotic Cytosol](https://cshmonographs.org/index.php/monographs/article/view/4898/0)
5. [T-complex polypeptide-1 is a subunit of a heteromeric particle in the eukaryotic cytosol (Nature, 1991)](https://www.nature.com/articles/358249a0)
6. [Chaperonin-containing TCP-1 (CCT), actin springs, and protein folding fluxes | HSTalks](https://hstalks.com/t/341/chaperonin-containing-tcp-1-cct-actin-springs-and-/)
7. [A major rearrangement in the H–2 complex of mouse t haplotypes (Nature, 1983)](https://doi.org/10.1038/304549a0)
8. https://doi.org/10.1016/0092-8674(89)90131-1
9. [A UK-centric history of studies on the mouse t-complex (Int. J. Developmental Biology)](https://doi.org/10.1387/ijdb.10761848)
10. [The t-complex polypeptide 1 complex is a chaperonin for tubulin and actin in vivo](https://pmc.ncbi.nlm.nih.gov/articles/PMC47580/)
11. [The structure and evolution of eukaryotic chaperonin-containing TCP-1 and its mechanism that folds actin into a protein spring (Biochemical Journal, 2018)](https://doi.org/10.1042/bcj20170378)
12. [Single Molecules Research | Imperial College Chemistry (Klug group)](https://www.ch.ic.ac.uk/klug/Research/SingleMolec/ResearchSMol.html)
13. [Working to Identify Proteins Inside Cells | Institute of Cancer Research](https://www.icr.ac.uk/about-us/icr-news/detail/working-to-identify-proteins-inside-cells)
14. [Single-molecule dynamics of the TRiC chaperonin system in vivo | Nature, 2025](https://www.nature.com/articles/s41586-025-10073-3)
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