Phosphoproteome Analysis Links Protein Phosphorylation to Cellular Remodeling and Metabolic Adaptation during Magnaporthe oryzae Appressorium Development.
The rice pathogen, Magnaporthe oryzae, undergoes a complex developmental process leading to formation of an appressorium prior to plant infection. In an effort to better understand phosphoregulation during appressorium development, a mass spectrometry based phosphoproteomics study was undertaken. A total of 2924 class I phosphosites were identified from 1514 phosphoproteins from mycelia, conidia, germlings, and appressoria of the wild type and a protein kinase A (PKA) mutant. Phosphoregulation during appressorium development was observed for 448 phosphosites on 320 phosphoproteins. In addition, a set of candidate PKA targets was identified encompassing 253 phosphosites on 227 phosphoproteins. Network analysis incorporating regulation from transcriptomic, proteomic, and phosphoproteomic data revealed new insights into the regulation of the metabolism of conidial storage reserves and phospholipids, autophagy, actin dynamics, and cell wall metabolism during appressorium formation. In particular, protein phosphorylation appears to play a central role in the regulation of autophagic recycling and actin dynamics during appressorium formation. Changes in phosphorylation were observed in multiple components of the cell wall integrity pathway providing evidence that this pathway is highly active during appressorium development. Several transcription factors were phosphoregulated during appressorium formation including the bHLH domain transcription factor MGG_05709. Functional analysis of MGG_05709 provided further evidence for the role of protein phosphorylation in regulation of glycerol metabolism and the metabolic reprogramming characteristic of appressorium formation. The data presented here represent a comprehensive investigation of the M. oryzae phosphoproteome and provide key insights on the role of protein phosphorylation during infection-related development.
†Center for Integrated Fungal Research, Department of Plant Pathology and ‡W.M. Keck Fourier Transform-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27606, United States.
William L
WL
Franck
†Center for Integrated Fungal Research, Department of Plant Pathology and ‡W.M. Keck Fourier Transform-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27606, United States.
Emine
E
Gokce
†Center for Integrated Fungal Research, Department of Plant Pathology and ‡W.M. Keck Fourier Transform-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27606, United States.
Shan M
SM
Randall
†Center for Integrated Fungal Research, Department of Plant Pathology and ‡W.M. Keck Fourier Transform-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27606, United States.
Yeonyee
Y
Oh
†Center for Integrated Fungal Research, Department of Plant Pathology and ‡W.M. Keck Fourier Transform-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27606, United States.
Alex
A
Eyre
†Center for Integrated Fungal Research, Department of Plant Pathology and ‡W.M. Keck Fourier Transform-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27606, United States.
David C
DC
Muddiman
†Center for Integrated Fungal Research, Department of Plant Pathology and ‡W.M. Keck Fourier Transform-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27606, United States.
Ralph A
RA
Dean
D000222:Adaptation, Physiological; D051792:Basic Helix-Loop-Helix Proteins / Q000378:metabolism; D002853:Chromatography, Liquid; D005656:Fungal Proteins / Q000378:metabolism*; D020082:Magnaporthe / Q000378:metabolism* / Q000502:physiology; D012275:Oryza / Q000382:microbiology; D010750:Phosphoproteins / Q000378:metabolism*; D010766:Phosphorylation; D040901:Proteomics; D015398:Signal Transduction; D053719:Tandem Mass Spectrometry
D051792:Basic Helix-Loop-Helix Proteins; D005656:Fungal Proteins; D010750:Phosphoproteins
Magnaporthe oryzae; appressorium formation; network analysis; quantitative phosphoproteomics; transcription factors