8FE9 image
Entry Detail
PDB ID:
8FE9
Title:
Crystal structure of Ack1 kinase K161Q mutant in complex with the selective inhibitor (R)-9b
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2022-12-06
Release Date:
2023-03-29
Method Details:
Experimental Method:
Resolution:
3.20 Å
R-Value Free:
0.22
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
I 4 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Activated CDC42 kinase 1
Mutations:K161Q
Chain IDs:A
Chain Length:287
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Biochemical Studies of Systemic Lupus Erythematosus-Associated Mutations in Nonreceptor Tyrosine Kinases Ack1 and Brk.
Biochemistry 62 1124 1137 (2023)
PMID: 36854171 DOI: 10.1021/acs.biochem.2c00685

Abstact

Tyrosine kinases (TKs) play essential roles in signaling processes that regulate cell survival, migration, and proliferation. Dysregulation of tyrosine kinases underlies many disorders, including cancer, cardiovascular and developmental diseases, as well as pathologies of the immune system. Ack1 and Brk are nonreceptor tyrosine kinases (NRTKs) best known for their roles in cancer. Here, we have biochemically characterized novel Ack1 and Brk mutations identified in patients with systemic lupus erythematosus (SLE). These mutations are the first SLE-linked polymorphisms found among NRTKs. We show that two of the mutants are catalytically inactive, while the other three have reduced activity. To understand the structural changes associated with the loss-of-function phenotype, we solved the crystal structure of one of the Ack1 kinase mutants, K161Q. Furthermore, two of the mutated residues (Ack1 A156 and K161) critical for catalytic activity are highly conserved among other TKs, and their substitution in other members of the kinase family could have implications in cancer. In contrast to canonical gain-of-function mutations in TKs observed in many cancers, we report loss-of-function mutations in Ack1 and Brk, highlighting the complexity of TK involvement in human diseases.

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Primary Citation of related structures