Proteome analysis of gametophores identified a metallothionein involved in various abiotic stress responses in Physcomitrella patens

Sung Hyun Cho, Quoc Truong Hoang, Yoon Young Kim, Hyun Young Shin, Sung Han Ok, Jung Myung Bae, Jeong Sheop Shin

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Physcomitrella patens is a model plant for studying gene function using a knockout strategy. To establish a proteome database for P. patens, we resolved over 1,500 soluble proteins from gametophore and protonema tissues by two-dimensional electrophoresis (2-DE) and obtained peptide mass fingerprints (PMFs) by matrix-assisted laser desorption/ionization-time of flight-mass spectrometry (MALDI-TOF-MS). Using expressed sequence tags (ESTs), we were able to predict the identities of 90 protein spots. Most of these were related to energy or primary metabolism. Comparative proteome analysis was used to identify proteins specific for each of the tissue types. One of these was a metallothionein type-2 (PpMT2) protein that was highly upregulated in gametophore tissue. PpMT2 was induced in both the gametophore and protonema following culture on solid media and in response to various abiotic stresses such as copper, cadmium, cold, indole-3-acetic acid, and ethylene. We suggest that PpMT2 is not only involved in metal binding and detoxification, but also in many biological aspects as a metal messenger or a protein with additional functions.

Original languageEnglish
Pages (from-to)475-488
Number of pages14
JournalPlant Cell Reports
Volume25
Issue number5
DOIs
Publication statusPublished - 2006 May 1

ASJC Scopus subject areas

  • Plant Science

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