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Identification and characterization of protein composition in Withania somnifera—an Indian ginseng

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Abstract

To have better understanding of the processes that occur in Withania somnifera L. Dunal, proteome analyses were initiated on two tissues (seeds & leaves) of this plant. Protein extracts were separated by two-dimensional gel electrophoresis (2-DE) across a broad 3.0–10.0 immobilized pH gradient (IPG) strip that yielded 434 protein spots. A total of 167 individual spots (82 from seeds and 85 from leaves) were excised from the gel and were characterized by peptide mass fingerprinting. From these analyses, 70 individual proteins from seeds and 74 from leaves were identified by protein sequence database interrogation and were catalogued accordingly to different protein functions. A comparative analysis of the two tissues indicated that some enzymes/proteins involved in housekeeping pathways were common to both, whereas some were exclusively tissue specific with specialized metabolic complement. The knowledge gained by this study towards the tissue specific protein expression in W. somnifera would form the basis for our future endeavor of characterization of proteins to understand the physiology and the associated complex metabolic network during its ontogenetic development.

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Abbreviations

2-DE:

Two-dimensional gel electrophoresis

IPG:

Immobilized pH gradient

SGTL1:

Sterol glucosyltransferases

TCA:

Trichloroacetic acid

CHAPS:

3-[(3-cholamidopropyl) dimethylammonio]-1-propanesulfonate

DTT:

Dithiothreitol

SDS-PAGE:

Sodium dodecyl sulfate–polyacrylamide gel electrophoresis

IEF:

Isoelectric focusing

IAA:

Iodoacetamide

MALDI-TOF-MS:

Matrix-assisted laser desorption/ionization-time of flight mass spectrometry

PMF:

Peptide mass fingerprinting.

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Acknowledgements

Authors are thankful to the Council of Scientific and Industrial Research (CSIR), New Delhi, Government of India, for funding the present research work under Network Programme NWP 0008.

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Correspondence to Rekha Sapru Dhar.

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Dhar, R.S., Gupta, S.B., Singh, P.P. et al. Identification and characterization of protein composition in Withania somnifera—an Indian ginseng. J. Plant Biochem. Biotechnol. 21, 77–87 (2012). https://doi.org/10.1007/s13562-011-0083-0

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  • DOI: https://doi.org/10.1007/s13562-011-0083-0

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