AUTHOR=Xu Manlin , Zhang Xia , Yu Jing , Guo Zhiqing , Li Ying , Song Xinying , He Kang , Li Guowei , Chi Yucheng 

TITLE=Proteome-Wide Analysis of Lysine 2-Hydroxyisobutyrylation in Aspergillus niger in Peanuts

JOURNAL=Frontiers in Microbiology

VOLUME=12

YEAR=2021

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2021.719337

DOI=10.3389/fmicb.2021.719337

ISSN=1664-302X

ABSTRACT=<p><italic>Aspergillus niger</italic> is a very destructive pathogen causing severe peanut root rot, especially in the seeding stage of peanuts (<italic>Arachis hypogaea</italic>), and often leading to the death of the plant. Protein lysine 2-hydroxyisobutyrylation (Khib) is a newly detected post-translational modification identified in several species. In this study, we identified 5041 Khib sites on 1,453 modified proteins in <italic>A. niger</italic>. Compared with five other species, <italic>A. niger</italic> has conserved and novel proteins. Bioinformatics analysis showed that Khib proteins are widely distributed in <italic>A. niger</italic> and are involved in many biological processes. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses revealed that Khib proteins were significantly enriched in many cellular compartments and pathways, such as ribosomes and proteasome subunits. A total of 223 Khib proteins were part of the PPI network, thus, suggesting that Khib proteins are associated with a large range of protein interactions and diverse pathways in the life processes of <italic>A. niger</italic>. Several identified proteins are involved in pathogenesis regulation. Our research provides the first comprehensive report of Khib and an extensive database for potential functional studies on Khib proteins in this economically important fungus.</p>