6H4A image
Entry Detail
PDB ID:
6H4A
Keywords:
Title:
Human MALT1(329-728) in complex with MLT-748
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2018-07-20
Release Date:
2019-02-13
Method Details:
Experimental Method:
Resolution:
2.65 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Mucosa-associated lymphoid tissue lymphoma translocation protein 1
Chain IDs:A
Chain Length:404
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
An allosteric MALT1 inhibitor is a molecular corrector rescuing function in an immunodeficient patient.
Nat. Chem. Biol. 15 304 313 (2019)
PMID: 30692685 DOI: 10.1038/s41589-018-0222-1

Abstact

MALT1 paracaspase is central for lymphocyte antigen-dependent responses including NF-κB activation. We discovered nanomolar, selective allosteric inhibitors of MALT1 that bind by displacing the side chain of Trp580, locking the protease in an inactive conformation. Interestingly, we had previously identified a patient homozygous for a MALT1 Trp580-to-serine mutation who suffered from combined immunodeficiency. We show that the loss of tryptophan weakened interactions between the paracaspase and C-terminal immunoglobulin MALT1 domains resulting in protein instability, reduced protein levels and functions. Upon binding of allosteric inhibitors of increasing potency, we found proportionate increased stabilization of MALT1-W580S to reach that of wild-type MALT1. With restored levels of stable MALT1 protein, the most potent of the allosteric inhibitors rescued NF-κB and JNK signaling in patient lymphocytes. Following compound washout, MALT1 substrate cleavage was partly recovered. Thus, a molecular corrector rescues an enzyme deficiency by substituting for the mutated residue, inspiring new potential precision therapies to increase mutant enzyme activity in other deficiencies.

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Primary Citation of related structures