PIM kinases phosphorylate lactate dehydrogenase A at serine 161 and suppress its nuclear ubiquitination

Kwan Long Mung, Annika Meinander, Päivi J Koskinen

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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 14-3-3ε, which shields nuclear LDHA from ubiquitin-mediated degradation.

Original languageEnglish
Number of pages14
JournalFEBS Journal
Early online date14 Oct 2022
DOIs
Publication statusE-pub ahead of print - 14 Oct 2022
MoE publication typeA1 Journal article-refereed

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