Tribbles pseudokinases: novel targets for chemical biology and drug discovery?

Abstract:

:Tribbles (TRIB) proteins are pseudokinase mediators of eukaryotic signalling that have evolved important roles in lipoprotein metabolism, immune function and cellular differentiation and proliferation. In addition, an evolutionary-conserved modulation of PI3K/AKT signalling pathways highlights them as novel and rather unusual pharmaceutical targets. The three human TRIB family members are uniquely defined by an acidic pseudokinase domain containing a 'broken' α C-helix and a MEK (MAPK/ERK)-binding site at the end of the putative C-lobe and a distinct C-terminal peptide motif that interacts directly with a small subset of cellular E3 ubiquitin ligases. This latter interaction drives proteasomal-dependent degradation of networks of transcription factors, whose rate of turnover determines the biological attributes of individual TRIB family members. Defining the function of individual Tribs has been made possible through evaluation of individual TRIB knockout mice, siRNA/overexpression approaches and genetic screening in flies, where the single TRIB gene was originally described 15 years ago. The rapidly maturing TRIB field is primed to exploit chemical biology approaches to evaluate endogenous TRIB signalling events in intact cells. This will help define how TRIB-driven protein-protein interactions and the atypical TRIB ATP-binding site, fit into cellular signalling modules in experimental scenarios where TRIB-signalling complexes remain unperturbed. In this mini-review, we discuss how small molecules can reveal rate-limiting signalling outputs and functions of Tribs in cells and intact organisms, perhaps serving as guides for the development of new drugs. We predict that appropriate small molecule TRIB ligands will further accelerate the transition of TRIB pseudokinase analysis into the mainstream of cell signalling.

journal_name

Biochem Soc Trans

authors

Foulkes DM,Byrne DP,Bailey FP,Eyers PA

doi

10.1042/BST20150109

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

1095-103

issue

5

eissn

0300-5127

issn

1470-8752

pii

BST20150109

journal_volume

43

pub_type

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