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Functional expression and purification of tailor-made chimeric endolysin with the broad antibacterial spectrum

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Abstract

Developing chimeric lysins with a wide lytic spectrum is important in fighting against Gram-negative pathogenic bacteria. In the present work, a novel chimerical lysin, LytAmfi, was constructed by fusing the bacteriophage endolysin Lyt μ1/6 with an amphipathic cationic peptide derived from T4 lysozyme. The result showed that the LytAmfi had not only lytic activity similar to parental Streptomyces aureofaciens endolysin Lyt μ1/6 but also broadened lytic activity against Gram-negative strains. Our work demonstrated that generating a novel chimeric lysin with an extended lytic spectrum was workable by fusing an active modular endolysin with an amphipathic cationic peptide that could penetrate the outer membrane of Gram-negative bacteria including Escherichia coli, Pseudomonas agglomerans, Acinetobacter lwoffii, Hafnia alvei, Citrobacter freundii and enable access of the lysin to lyse the bacteria ‘from within’ the host cell without pre-treatment of its outer membrane. Therefore, lysins with an extended spectrum of lytic activity would be of appreciable therapeutic value.

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Abbreviations

CBD:

C-terminal cell-wall binding domain

CD-search:

Conserved domain Search service

CFU:

Colony-forming unit

ECD:

SN-terminal catalytic domain

FPLC:

Fast protein liquid chromatography

GFP:

Green fluorescent protein

HEPES:

2-[4-(2-hydroxyethyl)piperazin-1-yl]ethane sulfonic acid

IPTG:

Isopropyl β-D-1-thiogalactopyranoside

LB:

Lysogeny broth

LBS:

Lysogeny broth with high salt

NCBI:

National Center for Biotechnology Information

Ni-NTA:

Nickel-nitrilotriacetic acid

OD:

Optical density

PCR:

Polymerase chain reaction

PDB:

Protein data bank

PGRP:

Peptidoglycan recognition proteins

PHAGE:

Bacteriophage

PSI-BLAST:

Position-specific iterated basic local alignment search tool

SDS-PAGE:

Sodium dodecyl sulphate polyacrylamide gel electrophoresis

TB:

Terrific broth

TBG:

Terrific broth with glycylglycine

References

PDB ID: 1yB0

PDB ID: 3D2Y

  • Kerff F, Petrella S, Mercier F, Sauvage E, Herman R, Pennartz A, Zervosen A, Luxen A, Frère JM, Joris B, Charlier P (2010) Specific structural features of the N-acetylmuramoyl-l-alanine amidase AmiD from Escherichia coli and mechanistic implications for enzymes of this family. J Mol Biol 397:249–259. https://doi.org/10.1016/j.jmb.2009.12.038

    Article  CAS  PubMed  Google Scholar 

PDB ID: 3rdR

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Acknowledgments

We would like to thank especially Dr. Lubica Urbanikova for valuable recommendations, proposal and help in predicting the tertiary structure of Lyt μ1/6. The authors also acknowledge doc. Dr. Peter Pristas and the Institute of Biology and Ecology, Pavol Jozef Safarik University in Kosice for providing of Gram-negative bacterial isolates. This work was financially supported by APVV grant APVV-16-0173 and VEGA grant no.2/0123/14 from the Scientific Grant Agency of the Ministry of Education, Sciences, Research and Sports of the Slovak Republic, and Slovak Academy of Sciences.

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Correspondence to Michaela Mancoš.

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Mancoš, M., Šramková, Z., Peterková, D. et al. Functional expression and purification of tailor-made chimeric endolysin with the broad antibacterial spectrum. Biologia 75, 2031–2043 (2020). https://doi.org/10.2478/s11756-020-00508-9

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  • DOI: https://doi.org/10.2478/s11756-020-00508-9

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