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Prothymosin α (ProTα) is an acidic protein with a nuclear role related to the chromatin activity through its interaction with histones in mammalian cells. ProTα acts as an anti-apoptotic factor involved in the control of the apoptosome activity in the cytoplasm, however the mechanisms underlying this function are still known. ProTα shares similar biological functions with acidic nuclear-cytoplasmic shuttling proteins included in SET and ANP32 family members. Using affinity chromatography, co-immunoprecipitation and chemical cross-linking, we demonstrate that ProTα interacts with SET, ANP32A and ANP32B proteins. The study by mass spectrometry of the complexes stabilized by chemical cross-linking showed that associations of ProTα consist of six highly acidic ProTα-complexes, which corresponds to differentiated interactions of ProTα either with SET or ANP32 proteins. The presence in the ProTα-complexes of cytoplasmic proteins involved in membrane remodeling and proteins implicated in the mitochondrial permeability, seems to indicate that they could be related to a cytoplasmic-mitochondrial activity. According to the cellular function of the characterized targets of ProTα, and the evolution in the composition of the diverse ProTα-complexes when proliferation activity was reduced or apoptosis induced, leads to hypothesized that ProTα interactions might be related to the proliferation activity and control of the cell survival. Copyright © 2017. Published by Elsevier Inc.


Pablo Barbeito, Concepción S Sarandeses, Cristina Díaz-Jullien, Juan Muras, Guillermo Covelo, David Moreira, Carmen Freire-Cobo, Manuel Freire. Prothymosin α interacts with SET, ANP32A and ANP32B and other cytoplasmic and mitochondrial proteins in proliferating cells. Archives of biochemistry and biophysics. 2017 Dec 01;635:74-86

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PMID: 29106904

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