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

ABSTRACT: Aspergillus niger is a very destructive pathogen causing severe peanut root rot, especially in the seeding stage of peanuts (Arachis hypogaea), 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 1453 modified proteins in A. niger. Compared with five other species, A. niger has conserved and novel proteins. Bioinformatics analysis showed that Khib proteins are widely distributed in A. niger and are involved in many biological processes. GO and 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 Knib proteins were part of the PPI network, thus, suggesting that Knib proteins are associated with a large range of protein interactions and diverse pathways in the life processes of A. niger. Several identified proteins are involved in pathogenesis regulation. Our research provides the first comprehensive report of lysine 2-hydroxyisobutyrylation and an extensive database for potential functional studies on Knib proteins in this economically important fungus.

INSTRUMENT(S): Q Exactive HF

ORGANISM(S): Aspergillus Aff. Niger A2

TISSUE(S): Whole Body

SUBMITTER: Xianliang Ma

LAB HEAD: Yucheng Chi

PROVIDER: PXD026373 | Pride | 2021-06-01

REPOSITORIES: Pride

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	K2ohibu_03.raw	Raw
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Proteome-Wide Analysis of Lysine 2-Hydroxyisobutyrylation in the Aspergillus niger in Peanuts

Project description:Aspergillus niger is a very destructive pathogen causing severe peanut root rot, especially in the seeding stage of peanuts (Arachis hypogaea), 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 1453 modified proteins in A. niger. Compared with five other species, A. niger has conserved and novel proteins. Bioinformatics analysis showed that Khib proteins are widely distributed in A. niger and are involved in many biological processes. GO and 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 Knib proteins were part of the PPI network, thus, suggesting that Knib proteins are associated with a large range of protein interactions and diverse pathways in the life processes of A. niger. Several identified proteins are involved in pathogenesis regulation. Our research provides the first comprehensive report of lysine 2-hydroxyisobutyrylation and an extensive database for potential functional studies on Knib proteins in this economically important fungus.

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Proteome-wide analysis of Lysine 2-Hydroxyisobutyrylation in Aspergillus fumigatus

Project description:Aspergillus fumigatus is the main culprit of invasive aspergillosis, which has a high mortality rate in immunocompromised patients. Lysine 2-hydroxyisobutyrylation is a highly conserved posttranslational modification found in a wide variety of organisms. In this study, we survey the biological impact of 2-hydroxyisobutyrylation on lysine residuals (Khib) in A. fumigatus. Using an antibody-enrichment approach along with the traditional LC-MS/MS method, the pattern of Khib-modified proteins and sites were analyzed in one wild type strain of A. fumigatus. We identified 3494 Khib-modified proteins with 18091 modified sites in this strain, and a more detailed bioinformatics analysis indicated that the Khib-modified proteins are involved in a wide range of cellular functions with diverse subcellular locations. Functional enrichment analysis featured several prominent functional pathways, including ribosome, biosynthesis of amino acids and nucleocytoplasmic transport – of which the ribosome pathway is the most affected pathway. When compared with other reported Khib eukaryotes, both Khib-modified sites and Khib-modified proteins also remained the highest. It proves that this modification is of great importance in A. fumigatus. At the same time, several enzymes in the fungal ergosterol synthesis pathway are modified with Khib. These bioinformatic results suggest that 2-hydroxyisobutyrylation may play an indispensable role in the regulation of the ribosomal biogenesis and the process of fungal resistance. Findings in this study may provide new insights for studying PTM-associated mechanisms in fungal development and antifungal drug development.

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