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Chemical structure and biological activity of the Caenorhabditis elegans dauer-inducing pheromone

Abstract

Pheromones are cell type-specific signals used for communication between individuals of the same species. When faced with overcrowding or starvation, Caenorhabditis elegans secrete the pheromone daumone, which facilitates communication between individuals for adaptation to adverse environmental stimuli1,2,3,4. Daumone signals C. elegans to enter the dauer stage, an enduring and non-ageing stage of the nematode life cycle with distinctive adaptive features and extended life. Because daumone is a key regulator of chemosensory processes in development and ageing5,6, the chemical identification of daumone is important for elucidating features of the daumone-mediated signalling pathway. Here we report the isolation of natural daumone from C. elegans by large-scale purification, as well as the total chemical synthesis of daumone. We present the stereospecific chemical structure of purified daumone, a fatty acid derivative. We demonstrate that both natural and chemically synthesized daumones equally induce dauer larva formation in C. elegans (N2 strain) and certain dauer mutants, and also result in competition between food and daumone. These results should help to elucidate the daumone-mediated signalling pathway, which might in turn influence ageing and obesity research and the development of antinematodal drugs.

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Figure 1: Molecular structure of daumone: (-)-(6R)-(3,5-dihydroxy-6-methyltetrahydropyran-2-yloxy)heptanoic acid.
Figure 2: Stereospecific total synthesis of daumone.
Figure 3: Validation of daumone function.

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Acknowledgements

This study was supported by a grant to Y.K.P. from the Korea Health 21 R&D Project, Ministry of Health and Welfare, Republic of Korea. We thank J.-M. Kim at KDR Biotech Co. for his support on this project, D.J. Chitwood at the USDA-ARS Nematology Lab for his critical reading and suggestions, R. Moyer at King College (USA) for editorial assistance, J. Lee at Seoul National University for discussions and the Caenorhabditis Genetics Center for kind provision of the C. elegans strains used in this study. Technical support from the LG Chem Research Center (Taejon, Korea) was appreciated.

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Correspondence to Young-Ki Paik.

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Supplementary information

Supplementary Methods

Description of methods used for the chemical synthesis of daumone. (DOC 226 kb)

Supplementary Table 1

Chemical shift of daumone by NMR analysis. (JPG 156 kb)

Supplementary Table 2

Differential dauer formation by food and daumone, which exhibits a conditional competition. (JPG 240 kb)

Supplementary Table 3

HRMS, R f and elemental analysis data. (JPG 210 kb)

Supplementary Table 4

Comparison of spectral data. (JPG 135 kb)

Supplementary Figure 1

A representative chromatogram of columns, molecular structure and fragmentation patterns of daumone. (JPG 116 kb)

Supplementary Figure 2

DEPT spectrum of the daumone. (JPG 65 kb)

Supplementary Figure 3

2D 1H, 13C HMBC spectrum of the daumone. (JPG 68 kb)

Supplementary Figure 4

2D TOCSY spectrum of the daumone. (JPG 63 kb)

Supplementary Figure 5

The observed ROEs of the daumone. (JPG 72 kb)

Supplementary Figure 6

500MHz 1H NMR spectrum of compound 1 (synthetic) at 298 K. (JPG 67 kb)

Supplementary Figure 7

500MHz 1H NMR spectrum of compound 1 (natural) at 298 K. (JPG 46 kb)

Supplementary Figure 8

125.7MHz 13C NMR spectrum of compound 1 at 298 K. (JPG 63 kb)

Supplementary Figure 9

500MHz DEPT spectrum of compound 1 at 298 K. (JPG 74 kb)

Supplementary Figure 10

500MHz HMBC spectrum of compound 1 at 298 K. (JPG 55 kb)

Supplementary Figure 11

500MHz ROESY spectrum of compound 1 at 298 K (JPG 47 kb)

Supplementary Figure 12

500MHz NOESY spectrum of compound 1 at 298 K. (JPG 81 kb)

Supplementary Figure 13

FT-IR spectrum of compound 1 at 298 K. (JPG 124 kb)

Supplementary Figure 14

HRMS(FAB) spectrum of compound 1 at 298 K. (JPG 85 kb)

Supplementary Figure 15

High resolution Q-TOF mass spectrum of compound 1. (JPG 34 kb)

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Jeong, PY., Jung, M., Yim, YH. et al. Chemical structure and biological activity of the Caenorhabditis elegans dauer-inducing pheromone. Nature 433, 541–545 (2005). https://doi.org/10.1038/nature03201

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