Refereed journal article or data article (A1)
PIM kinases phosphorylate lactate dehydrogenase A at serine 161 and suppress its nuclear ubiquitination
List of Authors: Mung Kwan Long, Meinander Annika, Koskinen Päivi J.
Publisher: WILEY
Publication year: 2022
Journal: FEBS Journal
Journal acronym: FEBS J
Number of pages: 14
ISSN: 1742-464X
eISSN: 1742-4658
DOI: http://dx.doi.org/10.1111/febs.16653
URL: https://febs.onlinelibrary.wiley.com/doi/epdf/10.1111/febs.16653
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/177357532
Abstract
Lactate dehydrogenase A (LDHA) is a glycolytic enzyme catalysing the reversible conversion of pyruvate to lactate. It has been implicated as a substrate for PIM kinases, yet the relevant target sites and functional consequences of phosphorylation have remained unknown. Here, we show that all three PIM family members can phosphorylate LDHA at serine 161. When we investigated the physiological consequences of this phosphorylation in PC3 prostate cancer and MCF7 breast cancer cells, we noticed that it suppressed ubiquitin-mediated degradation of nuclear LDHA and promoted interactions between LDHA and 14-3-3 proteins. By contrast, in CRISPR/Cas9-edited knock-out cells lacking all three PIM family members, ubiquitination of nuclear LDHA was dramatically increased followed by its decreased expression. Our data suggest that PIM kinases support nuclear LDHA expression and activities by promoting phosphorylation-dependent interactions of LDHA with 14-3-3 epsilon, which shields nuclear LDHA from ubiquitin-mediated degradation.
Lactate dehydrogenase A (LDHA) is a glycolytic enzyme catalysing the reversible conversion of pyruvate to lactate. It has been implicated as a substrate for PIM kinases, yet the relevant target sites and functional consequences of phosphorylation have remained unknown. Here, we show that all three PIM family members can phosphorylate LDHA at serine 161. When we investigated the physiological consequences of this phosphorylation in PC3 prostate cancer and MCF7 breast cancer cells, we noticed that it suppressed ubiquitin-mediated degradation of nuclear LDHA and promoted interactions between LDHA and 14-3-3 proteins. By contrast, in CRISPR/Cas9-edited knock-out cells lacking all three PIM family members, ubiquitination of nuclear LDHA was dramatically increased followed by its decreased expression. Our data suggest that PIM kinases support nuclear LDHA expression and activities by promoting phosphorylation-dependent interactions of LDHA with 14-3-3 epsilon, which shields nuclear LDHA from ubiquitin-mediated degradation.
Downloadable publication This is an electronic reprint of the original article. |  |
UTU Research Portal