Protein lactylation in health and diseases: molecular mechanisms, biological significance, and clinical implications
Abstract
Protein lysine lactylation (Kla) is a newly identified post-translational modification (PTM), in which lactyl groups are transferred to specific lysine residues in proteins. As a crucial intermediary between cellular metabolism and epigenetic regulation, Kla immensely increases the functional diversity of the proteome. This intriguing modification extends beyond histones to non-histone proteins, signaling molecules, enzymes, and substrates. In addition to enzymatic L-lactylation utilizing lactate as a lactyl donor and involving enzymes including writers (lactyltransferases), readers (lactylation-binding enzymes), erasers (delactylases), and lactyl-coenzyme A (lactyl-CoA) synthases, non-enzymatic D-lactylation derived from the glyoxalase II substrate S-D-lactoylglutathione (SLG) has also been identified. Emerging evidence underscores the molecular significance of Kla, including gene transcriptional activation, protein stability, enzyme activity, protein‒protein interactions, protein subcellular translocation, crosstalk with other PTMs, RNA modification, epigenetic instability, and phase separation, in orchestrating diverse biological processes. Functionally, Kla plays a fundamental role in physiology, such as somatic cell reprogramming, as well as embryonic, neural, and cochlear development, by regulating gene expression, cell cycle progression, and signal transduction. Conversely, dysregulated Kla renders extensive impacts on the pathogenesis of various diseases, including…
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