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Enzymatic Quorum Quenching for Virulence Attenuation of Phytopathogenic Bacteria

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Biotechnological Applications of Quorum Sensing Inhibitors

Abstract

Quorum sensing is a process of cell-cell communication by which the bacteria vary their gene expression mediated by a self-produced signalling molecule in a population density dependent manner to coordinate their behaviour which is virulence in phytopathogens. Quorum quenching or quorum sensing inhibition is a broad term used to include many diverse mechanisms that interfere with the quorum sensing signalling where signal degrading enzymes comprise one of the important mechanism. The signalling molecule, AHL (N-acyl homoserine lactone) is central to the process of quorum sensing in many Gram negative phytopathogenic bacteria. With constant rise in the number of resistant bacterial pathogens, enzymatic quorum quenching is an effective alternative way to attenuate their virulence. Quorum quenching does not kill the pathogen but stops its quorum sensing activity and thus does not introduce selective pressure which leads to development of resistance. Quorum sensing signal degrading strategy can thus be an effective means of biocontrol of phytopathogens. This chapter briefly discusses the virulence processes mediated by quorum sensing in Gram negative plant pathogens particularly in Pectobacterium carotovorum subsp. carotovorum. and their virulence attenuation by AHL degrading enzymes such as lactonases, acylases and oxido-reductases produced by various bacteria including Actinobacteria. The main focus is on enzymes produced by the quorum quenching bacteria, the genes that control the enzymes and the mechanism by which they attenuate quorum sensing mediated virulence in Gram negative phytopathogenic bacteria.

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Abbreviations

AHL:

N-acylhomoserine lactone

C-4-HSL:

N-butanoyl-L-homoserine lactone,

C-6-HSL:

N-hexanoyl-L-HSL,

C-10-HSL:

N-decanoyl-L-HSL,

C-12-HSL:

N-dodecanoyl-L-HSL,

3-O-C6-HSL:

N-(3-hydroxyhexanoyl)-L-HSL

3-O-C6-HSL:

N-(3-oxohexanoyl)-L-HSL,

3-O-C8-HSL:

N-(3-oxooctanoyl)-L-HSL,

3-O-C12-HSL:

N-(3-oxododecanoyl)-L-HSL

C-12-HSL:

N-dodecanoyl-L-HSL

HSL:

Homoserine lactone,

Pcc :

Pectobacterium carotovorum subsp. carotovorum,

PCWDE:

Plant Cell Wall Degrading Enzyme

QS:

Quorum Sensing,

QQ:

Quorum Quenching,

QSI:

Quorum sensing Inhibitor

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© 2018 Springer Nature Singapore Pte Ltd.

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Vesuna, A., Nerurkar, A.S. (2018). Enzymatic Quorum Quenching for Virulence Attenuation of Phytopathogenic Bacteria. In: Kalia, V. (eds) Biotechnological Applications of Quorum Sensing Inhibitors. Springer, Singapore. https://doi.org/10.1007/978-981-10-9026-4_21

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