Peer-Reviewed Journal Details
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O'Sullivan, LR;Ajaykumar, AP;Dembicka, KM;Murphy, A;Grennan, EP;Young, PW
2019
August
Febs Letters
Investigation of calmodulin-like and rod domain mutations suggests common molecular mechanism for alpha-actinin-1-linked congenital macrothrombocytopenia
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ALPHA-ACTININ TYROSINE PHOSPHORYLATION BINDING THROMBOCYTOPENIA MEGAKARYOCYTE VARIANTS PROTEIN
Actinin-1 mutations cause dominantly inherited congenital macrothrombocytopenia (CMTP), with mutations in the actin-binding domain increasing actinin's affinity for F-actin. In this study, we examined nine CMTP-causing mutations in the calmodulin-like and rod domains of actinin-1. These mutations increase, to varying degrees, actinin's ability to bundle actin filaments in vitro. Mutations within the calmodulin-like domain decrease its thermal stability slightly but do not dramatically affect calcium binding, with mutant proteins retaining calcium-dependent regulation of filament bundling in vitro. The G764S and E769K mutations increase cytoskeletal association of actinin in cells, and all mutant proteins colocalize with F-actin in cultured HeLa cells. Thus, CMTP-causing actinin-1 mutations outside the actin-binding domain also increase actin association, suggesting a common molecular mechanism underlying actinin-1 related CMTP.
HOBOKEN
0014-5793
10.1002/1873-3468.13562
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