Protein turnover is a key post-translational event that regulates numerous cellular processes. It enables cells to respond rapidly to intracellular signals and changing environmental conditions by adjusting the levels of pivotal proteins. A major proteolytic pathway involves the ubiquitination of target proteins and subsequent targeting to the 26S proteasome for degradation. Many F-box proteins play a determining role in the substrate specificity of this degradation pathway. In most cases, selective recognition of the target proteins relies on protein–protein interactions mediated by the C-terminal domain of the F-box proteins. In mammals, the occurrence of F-box proteins with a C-terminal SBD (sugar-binding domain) that specifically interacts with high-mannose N-glycans on target glycoproteins has been documented. The identification and characterization of these sugar-binding F-box proteins demonstrated that F-box proteins do not exclusively use protein–protein interactions but also protein–carbohydrate interactions in the Ub (ubiquitin)/proteasome pathway. Recently, putative sugar-binding F-box proteins have been identified in plants. Genome analyses in Arabidopsis and rice revealed the presence of F-box proteins with a C-terminal lectin-related domain homologous with Nictaba, a jasmonate-inducible lectin from tobacco that was shown to interact with the core structure of high-mannose and complex N-glycans. Owing to the high similarity in structure and specificity between Nictaba and the SBD of the mammalian Fbs proteins, a similar role for the plant F-box proteins with a Nictaba domain in nucleocytoplasmic protein degradation in plant cells is suggested.
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October 2008
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Conference Article|
September 19 2008
Do F-box proteins with a C-terminal domain homologous with the tobacco lectin play a role in protein degradation in plants?
Nausicaä Lannoo;
Nausicaä Lannoo
1Laboratory of Biochemistry and Glycobiology, Department of Molecular Biotechnology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
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Willy J. Peumans;
Willy J. Peumans
1Laboratory of Biochemistry and Glycobiology, Department of Molecular Biotechnology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
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Els J.M. Van Damme
Els J.M. Van Damme
1
1Laboratory of Biochemistry and Glycobiology, Department of Molecular Biotechnology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
1To whom any correspondence should be addressed (email [email protected]).
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Publisher: Portland Press Ltd
Received:
February 25 2008
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© The Authors Journal compilation © 2008 Biochemical Society
2008
Biochem Soc Trans (2008) 36 (5): 843–847.
Article history
Received:
February 25 2008
Citation
Nausicaä Lannoo, Willy J. Peumans, Els J.M. Van Damme; Do F-box proteins with a C-terminal domain homologous with the tobacco lectin play a role in protein degradation in plants?. Biochem Soc Trans 1 October 2008; 36 (5): 843–847. doi: https://doi.org/10.1042/BST0360843
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