Diverse Peptide Hormones Affecting Root Growth Identified in the Medicago truncatula Secreted Peptidome.

Molecular & Cellular Proteomics : MCP
Neha PatelMichael A Djordjevic

Abstract

Multigene families encoding diverse secreted peptide hormones play important roles in plant development. A need exists to efficiently elucidate the structures and post-translational-modifications of these difficult-to-isolate peptide hormones in planta so that their biological functions can be determined. A mass spectrometry and bioinformatics approach was developed to comprehensively analyze the secreted peptidome of Medicago hairy root cultures and xylem sap. We identified 759 spectra corresponding to the secreted products of twelve peptide hormones including four CEP (C-TERMINALLY ENCODED PEPTIDE), two CLE (CLV3/ENDOSPERM SURROUNDING REGION RELATED) and six XAP (XYLEM SAP ASSOCIATED PEPTIDE) peptides. The MtCEP1, MtCEP2, MtCEP5 and MtCEP8 peptides identified differed in post-translational-modifications. Most were hydroxylated at conserved proline residues but some MtCEP1 derivatives were tri-arabinosylated. In addition, many CEP peptides possessed unexpected N- and C-terminal extensions. The pattern of these extensions suggested roles for endo- and exoproteases in CEP peptide maturation. Longer than expected, hydroxylated and homogeneously modified mono- and tri-arabinosylated CEP peptides corresponding to their in vivo stru...Continue Reading

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Citations

Feb 5, 2019·Journal of Experimental Botany·Anna TornkvistPanagiotis N Moschou
May 6, 2019·Journal of Experimental Botany·Kelly ChapmanMichael A Djordjevic
Jun 25, 2019·Journal of Experimental Botany·Christine Kaufmann, Margret Sauter
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Jun 8, 2019·Journal of Experimental Botany·Christina DelayMichael A Djordjevic
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Oct 23, 2020·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Sakshi AggarwalAnanda Mustafiz
Dec 29, 2020·Trends in Plant Science·Pierre GautratSandrine Ruffel
Apr 6, 2021·Frontiers in Plant Science·Bent Larsen PetersenPeter Ulvskov
May 11, 2021·Frontiers in Plant Science·Jinghua ZhangWei Wang
Jun 2, 2021·Journal of Experimental Botany·Han-Chung LeeMichael A Djordjevic

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