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Comparative proteome analysis identifies species-specific signature proteins in Aspergillus pathogens

  • Genomics, Transcriptomics, Proteomics
  • Published:
Applied Microbiology and Biotechnology Aims and scope Submit manuscript

Abstract

Aspergillus flavus and Aspergillus fumigatus are important human pathogens that can infect the lung and cornea. During infection, Aspergillus dormant conidia are the primary morphotype that comes in contact with the host. As the conidial surface-associated proteins (CSPs) and the extracellular proteins during the early stages of growth play a crucial role in establishing infection, we profiled and compared these proteins between a clinical strain of A. flavus and a clinical strain of A. fumigatus. We identified nearly 100 CSPs in both Aspergillus, and these non-covalently associated surface proteins were able to stimulate the neutrophils to secrete interleukin IL-8. Mass spectrometry analysis identified more than 200 proteins in the extracellular space during the early stages of conidial growth and germination (early exoproteome). The conidial surface proteins and the early exoproteome of A. fumigatus were enriched with immunoreactive proteins and those with pathogenicity-related functions while that of the A. flavus were primarily enzymes involved in cell wall reorganization and binding. Comparative proteome analysis of the CSPs and the early exoproteome between A. flavus and A. fumigatus enabled the identification of a common core proteome and potential species-specific signature proteins. Transcript analysis of selected proteins indicate that the transcript-protein level correlation does not exist for all proteins and might depend on factors such as membrane-anchor signals and protein half-life. The probable signature proteins of A. flavus and A. fumigatus identified in this study can serve as potential candidates for developing species-specific diagnostic tests.

Key points

CSPs and exoproteins could differentiate A. flavus and A. fumigatus.

A. fumigatus conidial surface harbored more antigenic proteins than A. flavus.

Identified species-specific signature proteins of A. flavus and A. fumigatus.

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Data availability

The mass spectrometry proteomics data have been deposited to the ProteomeXchange Consortium via the PRIDE partner repository with the dataset identifiers:

• PXD022824 for the conidial surface-associated protein identification data

• PXD012982 for the exoproteome identification data.

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Funding

This work was supported by grants from the Indo-French Center for the Promotion of Advanced Research (IFCPAR)—grant no. IFC/5403-A/2015/1012. Project assistantship to LPV was provided by IFCPAR.

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Authors and Affiliations

Authors

Contributions

JMJ, DK, VA, VPN, and LP conceived and designed the research. VPN, LP, and VA contributed to the fungal isolates. LPV and JMJ performed the experiments and analyzed the data. JMJ, DK, and VA wrote the manuscript. All authors read and approved the manuscript

Corresponding author

Correspondence to Jeya Maheshwari Jayapal.

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This article does not contain any studies with human participants or animals performed by any of the authors.

Competing interests

The authors declare no competing interests.

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The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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Venugopalan, L.P., Aimanianda, V., Namperumalsamy, V.P. et al. Comparative proteome analysis identifies species-specific signature proteins in Aspergillus pathogens. Appl Microbiol Biotechnol 107, 4025–4040 (2023). https://doi.org/10.1007/s00253-023-12559-4

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  • DOI: https://doi.org/10.1007/s00253-023-12559-4

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