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Bioinformatics approach to understand nature’s unified mechanism of stereo-divergent synthesis of isoprenoid skeletons

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Abstract

In isoprenoid metabolism, cyclisation is the important gateway to chemical diversity. Terpene synthase is responsible for the cyclisation of a few universal substrates forming hundreds of often stereo-chemically complex mono- and poly-cyclic terpene hydrocarbons with a broad spectrum of functions in pharmaceuticals, flavours and fragrance industry. Although they are discovered and characterised mainly from plants and fungi, yet only a small share of bacterial terpenes has been investigated so far owing to their low level of expression in wild-type microorganisms. Extensive bacterial genome mining has revealed a treasure trove of terpene synthase genes and their regulated heterologous overexpression has pitched-in to describe the biochemical function of putative genes and sequester new terpene metabolites. This review deals with the modern genome mining techniques and molecular methods, providing more experimental tools for studying the structure and functions of terpenoid metabolites and strongly supports the idea that genome mining is a utile approach in deciphering the terpenoid diversity in bacteria.

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Adapted from Komatsu et al. 2008 and modified)

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Abbreviations

PKS:

Polyketide synthase

NRPS:

Non-ribosomal peptide synthetase

TC:

Terpene cyclase

BGC:

Biosynthetic gene cluster

TPS:

Terpene synthase

PS:

Pentalenene synthase

IPP:

Isopentenyl diphosphate

DMAPP:

Dimethylallyl diphosphate

MVA:

Mevalonic acid

DOXP:

Deoxyxylulose phosphate

GPP:

Geranyl diphosphate

FPP:

Farnesyl diphosphate

GGPP:

Geranyl geranyl diphosphate

SC:

Sesquiterpene cyclase

HMM:

Hidden Markov model

BLASTp:

Basic Local Alignment Sequence Tool for proteins

2-MIB:

2-Methylisoborneol

SAM:

S-Adenosyl-l-methionine

2-MeGPP:

2-Methyl geranyl diphosphate

2-MB:

2-Methylbornane

LPP:

Linalyl diphosphate

GS:

Geosmin synthase

EIZS:

epi-Isozizaene synthase

GC/MS:

Gas chromatography mass spectroscopy

CFE:

Cell free extract

VOC:

Volatile organic compounds

NMR:

Nuclear magnetic resonance

DTS:

Diterpene synthases

TDP:

Terpentetrienedienyl diphosphate

TTE:

Terpentetriene

ORF:

Open reading frame

CPP:

Copalyl diphosphate

Bds:

Bonnadiene synthase

Pms:

Phomopsene synthase

Sas:

Spiroalbatene synthase

CAS:

Cembrene A synthase

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Acknowledgements

PB acknowledges the independent BSR-RFSMS fellowship (F.7-209/2009(BSR)), awarded by the University Grants Commission (UGC). The financial assistance received from Department of Science and Technology-Promotion of University Research and Scientific Excellence (DST-PURSE) and University Grants Commission-Special Assistance Programme (UGC-SAP) (DRS Phase-I) is duly acknowledged. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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PB and DS conceived of the presented idea for the article. PB performed the literature search and data analysis. PB wrote the manuscript; DS provided critical feedback and helped to shape the manuscript.

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Correspondence to Dipti Sareen.

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Declaration This is to confirm that this manuscript has not been published elsewhere and is not under consideration by any other journal. Both the authors have approved the manuscript with full text, number of figures/tables and agree with its submission to the journal.

Electronic supplementary material

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11274_2020_2918_MOESM1_ESM.tif

Supplementary file 1 (TIF 50 kb) Fig. S1 Cyclisation of Farnesyl diphosphates (FPP) by sesquiterpene synthases. Initial ionisation of FPP leads to the formation of charge delocalized carbocation which undergoes intra-molecular electrophilic attack on central or distal double bond followed by hydride shift and carbon-carbon backbone rearrangements thereby forming enormous variety of cyclic terpene metabolites (Adapted from Dickschat 2016 and modified)

11274_2020_2918_MOESM2_ESM.docx

Supplementary file 2 (DOCX 29 kb) Table S1 Summary of the characterised terpene synthase genes from different strains of actinomycete and cyanobacteria

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Bhaskar, P., Sareen, D. Bioinformatics approach to understand nature’s unified mechanism of stereo-divergent synthesis of isoprenoid skeletons. World J Microbiol Biotechnol 36, 142 (2020). https://doi.org/10.1007/s11274-020-02918-y

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