TY - JOUR
T1 - Broad Substrate-Specific Phosphorylation Events Are Associated With the Initial Stage of Plant Cell Wall Recognition in Neurospora crassa
AU - Horta, Maria Augusta C.
AU - Thieme, Nils
AU - Gao, Yuqian
AU - Burnum-Johnson, Kristin E.
AU - Nicora, Carrie D.
AU - Gritsenko, Marina A.
AU - Lipton, Mary S.
AU - Mohanraj, Karthikeyan
AU - de Assis, Leandro José
AU - Lin, Liangcai
AU - Tian, Chaoguang
AU - Braus, Gerhard H.
AU - Borkovich, Katherine A.
AU - Schmoll, Monika
AU - Larrondo, Luis F.
AU - Samal, Areejit
AU - Goldman, Gustavo H.
AU - Benz, J. Philipp
N1 - Publisher Copyright:
© Copyright © 2019 Horta, Thieme, Gao, Burnum-Johnson, Nicora, Gritsenko, Lipton, Mohanraj, de Assis, Lin, Tian, Braus, Borkovich, Schmoll, Larrondo, Samal, Goldman and Benz.
PY - 2019/11/1
Y1 - 2019/11/1
N2 - Fungal plant cell wall degradation processes are governed by complex regulatory mechanisms, allowing the organisms to adapt their metabolic program with high specificity to the available substrates. While the uptake of representative plant cell wall mono- and disaccharides is known to induce specific transcriptional and translational responses, the processes related to early signal reception and transduction remain largely unknown. A fast and reversible way of signal transmission are post-translational protein modifications, such as phosphorylations, which could initiate rapid adaptations of the fungal metabolism to a new condition. To elucidate how changes in the initial substrate recognition phase of Neurospora crassa affect the global phosphorylation pattern, phospho-proteomics was performed after a short (2 min) induction period with several plant cell wall-related mono- and disaccharides. The MS/MS-based peptide analysis revealed large-scale substrate-specific protein phosphorylation and de-phosphorylations. Using the proteins identified by MS/MS, a protein-protein-interaction (PPI) network was constructed. The variance in phosphorylation of a large number of kinases, phosphatases and transcription factors indicate the participation of many known signaling pathways, including circadian responses, two-component regulatory systems, MAP kinases as well as the cAMP-dependent and heterotrimeric G-protein pathways. Adenylate cyclase, a key component of the cAMP pathway, was identified as a potential hub for carbon source-specific differential protein interactions. In addition, four phosphorylated F-Box proteins were identified, two of which, Fbx-19 and Fbx-22, were found to be involved in carbon catabolite repression responses. Overall, these results provide unprecedented and detailed insights into a so far less well known stage of the fungal response to environmental cues and allow to better elucidate the molecular mechanisms of sensory perception and signal transduction during plant cell wall degradation.
AB - Fungal plant cell wall degradation processes are governed by complex regulatory mechanisms, allowing the organisms to adapt their metabolic program with high specificity to the available substrates. While the uptake of representative plant cell wall mono- and disaccharides is known to induce specific transcriptional and translational responses, the processes related to early signal reception and transduction remain largely unknown. A fast and reversible way of signal transmission are post-translational protein modifications, such as phosphorylations, which could initiate rapid adaptations of the fungal metabolism to a new condition. To elucidate how changes in the initial substrate recognition phase of Neurospora crassa affect the global phosphorylation pattern, phospho-proteomics was performed after a short (2 min) induction period with several plant cell wall-related mono- and disaccharides. The MS/MS-based peptide analysis revealed large-scale substrate-specific protein phosphorylation and de-phosphorylations. Using the proteins identified by MS/MS, a protein-protein-interaction (PPI) network was constructed. The variance in phosphorylation of a large number of kinases, phosphatases and transcription factors indicate the participation of many known signaling pathways, including circadian responses, two-component regulatory systems, MAP kinases as well as the cAMP-dependent and heterotrimeric G-protein pathways. Adenylate cyclase, a key component of the cAMP pathway, was identified as a potential hub for carbon source-specific differential protein interactions. In addition, four phosphorylated F-Box proteins were identified, two of which, Fbx-19 and Fbx-22, were found to be involved in carbon catabolite repression responses. Overall, these results provide unprecedented and detailed insights into a so far less well known stage of the fungal response to environmental cues and allow to better elucidate the molecular mechanisms of sensory perception and signal transduction during plant cell wall degradation.
KW - fungi
KW - lignocellulose degradation
KW - Neurospora crassa
KW - phosphorylation
KW - proteomics
KW - signal transduction
KW - substrate recognition
UR - http://www.scopus.com/inward/record.url?scp=85075346022&partnerID=8YFLogxK
U2 - 10.3389/fmicb.2019.02317
DO - 10.3389/fmicb.2019.02317
M3 - Article
AN - SCOPUS:85075346022
SN - 1664-302X
VL - 10
JO - Frontiers in Microbiology
JF - Frontiers in Microbiology
M1 - 2317
ER -