Systematic Analysis of the Lysine Malonylome in Sanghuangporus Sanghuang

Abstract

Background: Sanghuangporus sanghuang is a well-known traditional medicinal mushroom associated with mulberry, which has enormous economic and medical value. Despite being known for many years, proteomics studies of S. sanghuang have not been reported. In this paper, a series of technologies, such as high-performance liquid chromatography (HPLC) classification technology, malonyl peptide segment enrichment technology and proteomics technology, are combined to study the qualitative analysis of malonylation in S. sanghuang.Results: Strategies for qualitative proteomics included malonyl enrichment and high-resolution liquid chromatography-tandem mass spectrometry (LC-MS/MS). In total, 714 malonyl modification sites were matched to 255 different proteins. The analysis indicated that malonyl modifications are involved in a wide range of acellular functions and displayed a distinct subcellular localization.Bioinformatics analysis indicates that malonylated proteins are engaged in different metabolic pathways, including glyoxylate and dicarboxylate metabolism, glycolysis/gluconeogenesis, and the tricarboxylic acid (TCA) cycle; consequently, a total of 26 enzymes related to triterpene and polysaccharide biosynthesis were found to be malonylated.Conclusions: These findings suggest that malonylation is associated with many metabolic pathways, particularly the metabolism of bioactive compounds. This paper provides the first comprehensive survey of malonylation in S. sanghuang.