CHRK1, a Chitinase-related Receptor-like Kinase in Tobacco
Overview
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A cDNA encoding a chitinase-related receptor-like kinase, designated CHRK1, was isolated from tobacco (Nicotiana tabacum). The C-terminal kinase domain (KD) of CHRK1 contained all of the conserved amino acids of serine/threonine protein kinases. The putative extracellular domain was closely related to the class V chitinase of tobacco and to microbial chitinases. CHRK1 mRNA accumulation was strongly stimulated by infection with fungal pathogen and tobacco mosaic virus. Amino acid-sequence analysis revealed that the chitinase-like domain of CHRK1 lacked the essential glutamic acid residue required for chitinase activity. The recombinant chitinase-like domain did not show any catalytic activity for either oligomeric or polymeric chitin substrates. The recombinant KD of CHRK1 exhibited autophosphorylation, but the mutant KD with a mutation in the essential ATP-binding site did not, suggesting that CHRK1 encoded a functional kinase. CHRK1 was detected in membrane fractions of tobacco BY2 cells. Furthermore, CHRK1-GFP fusion protein was localized in plasma membranes when it was expressed in animal cells. This is the first report of a new type of receptor-like kinase containing a chitinase-like sequence in the putative extracellular domain.
Emerging Roles of Receptor-like Protein Kinases in Plant Response to Abiotic Stresses.
Gandhi A, Oelmuller R Int J Mol Sci. 2023; 24(19).
PMID: 37834209 PMC: 10573068. DOI: 10.3390/ijms241914762.
Atanasova L, Dubey M, Grujic M, Gudmundsson M, Lorenz C, Sandgren M BMC Microbiol. 2018; 18(1):178.
PMID: 30404596 PMC: 6223089. DOI: 10.1186/s12866-018-1310-9.
Phylogenetic analysis of STK gene family and Usp domain in maize.
Zhou T, Fan M, Irfan M, Wang H, Wang D, Wang L Mol Biol Rep. 2014; 41(12):8273-84.
PMID: 25326719 DOI: 10.1007/s11033-014-3728-y.
Xu A, Huang L Acta Crystallogr F Struct Biol Commun. 2014; 70(Pt 2):236-9.
PMID: 24637764 PMC: 3936445. DOI: 10.1107/S2053230X13035024.
Tian Y, Liu W, Cai J, Zhang L, Wong K, Feddermann N Plant Physiol. 2013; 163(3):1179-90.
PMID: 24082029 PMC: 3813642. DOI: 10.1104/pp.113.223966.