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Type: Artigo de periódico
Title: Molecular characterization of a miraculin-like gene differentially expressed during coffee development and coffee leaf miner infestation
Author: MONDEGO, Jorge Mauricio Costa
DUARTE, Melina Pasini
KIYOTA, Eduardo
CAMARGO, Sandra Rodrigues de
CAROLI, Fernanda P. De
ALVES, Beatriz Santos Capela
GUERREIRO, Sandra Maria Carmello
OLIVA, Maria Luiza Vilela
MENOSSI, Marcelo
Abstract: The characterization of a coffee gene encoding a protein similar to miraculin-like proteins, which are members of the plant Kunitz serine trypsin inhibitor (STI) family of proteinase inhibitors (PIs), is described. PIs are important proteins in plant defence against insects and in the regulation of proteolysis during plant development. This gene has high identity with the Richadella dulcifica taste-modifying protein miraculin and with the tomato protein LeMir; and was named as CoMir (Coffea miraculin). Structural protein modelling indicated that CoMir had structural similarities with the Kunitz STI proteins, but suggested specific folding structures. CoMir was up-regulated after coffee leaf miner (Leucoptera coffella) oviposition in resistant plants of a progeny derived from crosses between C. racemosa (resistant) and C. arabica (susceptible). Interestingly, this gene was down-regulated during coffee leaf miner herbivory in susceptible plants. CoMir expression was up-regulated after abscisic acid application and wounding stress and was prominent during the early stages of flower and fruit development. In situ hybridization revealed that CoMir transcripts accumulated in the anther tissues that display programmed cell death (tapetum, endothecium and stomium) and in the metaxylem vessels of the petals, stigma and leaves. In addition, the recombinant protein CoMir shows inhibitory activity against trypsin. According to the present results CoMir may act in proteolytic regulation during coffee development and in the defence against L. coffeella. The similarity of CoMir with other Kunitz STI proteins and the role of CoMir in plant development and plant stress are discussed.
Subject: Coffee
Kunitz STI proteinase inhibitor
like protein
Plant-insect interaction
Programmed cell death
Country: Estados Unidos
Citation: PLANTA, v.233, n.1, p.123-137, 2011
Rights: fechado
Identifier DOI: 10.1007/s00425-010-1284-9
Date Issue: 2011
Appears in Collections:IB - Artigos e Outros Documentos

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