An inventory of the Aspergillus niger secretome by combining in silico predictions with shotgun proteomics data

Abstract:

Background

The ecological niche occupied by a fungal species, its pathogenicity and its usefulness as a microbial cell factory to a large degree depends on its secretome. Protein secretion usually requires the presence of a N-terminal signal peptide (SP) and by scanning for this feature using available highly accurate SP-prediction tools, the fraction of potentially secreted proteins can be directly predicted. However, prediction of a SP does not guarantee that the protein is actually secreted and current in silico prediction methods suffer from gene-model errors introduced during genome annotation.

Results

A majority rule based classifier that also evaluates signal peptide predictions from the best homologs of three neighbouring Aspergillus species was developed to create an improved list of potential signal peptide containing proteins encoded by the Aspergillus niger genome. As a complement to these in silico predictions, the secretome associated with growth and upon carbon source depletion was determined using a shotgun proteomics approach. Overall, some 200 proteins with a predicted signal peptide were identified to be secreted proteins. Concordant changes in the secretome state were observed as a response to changes in growth/culture conditions. Additionally, two proteins secreted via a non-classical route operating in A. niger were identified.

Conclusions

We were able to improve the in silico inventory of A. niger secretory proteins by combining different gene-model predictions from neighbouring Aspergilli and thereby avoiding prediction conflicts associated with inaccurate gene-models. The expected accuracy of signal peptide prediction for proteins that lack homologous sequences in the proteomes of related species is 85%. An experimental validation of the predicted proteome confirmed in silico predictions.

SEEK ID: https://hub.ibisba.eu/publications/3

PubMed ID: 20959013

DOI: 10.1186/1471-2164-11-584

Projects: An inventory of the Aspergillus niger secretome by combining in silico p...

Publication type: Journal

Journal: BMC genomics

Publisher: BMC Genomics

Citation: BMC Genomics 11(1),584

Date Published: 1st Dec 2010

URL: https://europepmc.org/articles/PMC3091731

Registered Mode: imported from a bibtex file

Authors: Machtelt Braaksma, Elena S Martens-Uzunova, Peter J Punt, Peter J Schaap

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Braaksma, M., Martens-Uzunova, E. S., Punt, P. J., & Schaap, P. J. (2010). An inventory of the Aspergillus niger secretome by combining in silico predictions with shotgun proteomics data. BMC Genomics, 11(1). http://doi.org/10.1186/1471-2164-11-584
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