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Molecular mechanisms of rhomboid-like proteins in human immunity

Objective

The immune system coordinates vital responses against a plethora of threats. It relies on well-described signalling networks via soluble proteins and cell-to-cell contacts. The secretory pathway traffics all secreted and surface proteins, but the mechanism of how immune cells control this process is unclear.
Rhomboid-like proteins are a family of polytopic intramembrane proteins serine proteases and pseudoenzymes found in all organisms. Most eukaryotic rhomboid-like proteins regulate the fate of proteins in the secretory pathway. The rhomboid protease RHBDL4 is reported to regulate ER associated degradation (ERAD). The rhomboid pseudoenzyme, iRhom2, is essential for the trafficking and maturation of TACE, and subsequent TNF release in response to inflammatory stimuli in myeloid cells. Little is understood about the mechanism of how these rhomboid-like proteins regulate trafficking.
I hypothesise that RHBDL4 regulates signalling networks in myeloid cells, similarly to iRhom2. Indeed, according to my preliminary data, RHBDL4 and iRhom2 are both expressed in human myeloid cells, and are induced by interferon gamma, a modulator of signalling networks in immunity.
In this project, I aim to provide cell biological and mechanistic insight into RHBDL4 and iRhom2 regulation of signalling networks in human immunity. I will identify new interactors of RHBDL4 and iRhom2 via a novel biochemical screen called BioID. Candidates will be validated using conventional cell biological methodologies and a new interaction assay called M-Track. I will confirm these interactions in a quasi-physiological context, using a human ex vivo macrophage system. The biological significance of the interactions will be studied using detergent-permeabilised cellular systems of human macrophages. My focus on human rhomboids and immunity integrates a very timely area of fundamental cell biology with a topic of direct relevance to human health.

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Topic(s)

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Funding Scheme

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MSCA-IF-EF-ST - Standard EF

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Call for proposal

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(opens in new window) H2020-MSCA-IF-2014

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Coordinator

THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 183 454,80
Address
WELLINGTON SQUARE UNIVERSITY OFFICES
OX1 2JD Oxford
United Kingdom

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Region
South East (England) Berkshire, Buckinghamshire and Oxfordshire Oxfordshire
Activity type
Higher or Secondary Education Establishments
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 183 454,80
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