Optimization of secretion and surface localization of heterologous OVA protein in mycobacteria by using LipY as a carrier View Full Text


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Article Info

DATE

2019-12

AUTHORS

Maroeska J. Burggraaf, Louis S. Ates, Alexander Speer, Kim van der Kuij, Coen Kuijl, Wilbert Bitter

ABSTRACT

BACKGROUND: Mycobacterium bovis Bacille Calmette-Guérin (BCG) is not only used as a vaccine against tuberculosis but also protects against leprosy and is used as part of bladder cancer treatment to induce a protective immune response. However, protection by BCG vaccination is not optimal. To improve vaccine efficacy, recombinant BCG expressing heterologous antigens has been put forward to elicit antigen-specific cellular and humoral responses. Cell surface localized or secreted antigens induce better immune responses than their cytosolic counterparts. Optimizing secretion of heterologous proteins or protein fragments holds therefore unexplored potential for improving the efficacy of recombinant BCG vaccine candidates. Secretion of heterologous antigens requires crossing the mycobacterial inner and outer membrane. Mycobacteria have specialized ESX or type VII secretion systems that enable translocation of proteins across both membranes. Probing this secretion system could therefore be a valid approach to surface localize heterologous antigens. RESULTS: We show that ESX-5 substrate LipY, a lipase, can be used as a carrier for heterologous secretion of an ovalbumin fragment (OVA). LipY contains a PE domain and a lipase domain, separated by a linker region. This linker domain is processed upon secretion. Fusion of the PE and linker domains of LipY to OVA enabled ESX-5-dependent secretion of the fusion construct LipY-OVA in M. marinum, albeit with low efficiency. Subsequent random mutagenesis of LipY-OVA and screening for increased secretion resulted in mutants with improved heterologous secretion. Detailed analysis identified two mutations in OVA that improved secretion, i.e. an L280P mutation and a protein-extending frameshift mutation. Finally, deletion of the linker domain of LipY enhanced secretion of LipY-OVA, although this mutation also reduced surface association. Further analysis in wild type LipY showed that the linker domain is required for surface association. CONCLUSION: We show that the ESX-5 system can be used for heterologous secretion. Furthermore, minor mutations in the substrate can enhance secretion. Especially the C-terminal region seems to be important for this. The linker domain of LipY is involved in surface association. These findings show that non-biased screening approaches aid in optimization of heterologous secretion, which can contribute to heterologous vaccine development. More... »

PAGES

44

References to SciGraph publications

Journal

TITLE

Microbial Cell Factories

ISSUE

1

VOLUME

18

From Grant

  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1186/s12934-019-1093-1

    DOI

    http://dx.doi.org/10.1186/s12934-019-1093-1

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1112585428

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/30841891


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    N-Triples is a line-based linked data format ideal for batch operations.

    curl -H 'Accept: application/n-triples' 'https://scigraph.springernature.com/pub.10.1186/s12934-019-1093-1'

    Turtle is a human-readable linked data format.

    curl -H 'Accept: text/turtle' 'https://scigraph.springernature.com/pub.10.1186/s12934-019-1093-1'

    RDF/XML is a standard XML format for linked data.

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