Further analysis of the interactions between the Brassica S receptor kinase and three interacting proteins (ARC1, THL1 and THL2) in the yeast two-hybrid system

Further analysis of the interactions between the Brassica S receptor kinase and three interacting... The yeast two-hybrid system was used to further characterize the interactions between the Brassica S receptor kinase (SRK) and three putative substrates, ARC1 and the two thioredoxin h proteins, THL1 and THL2. Interactions were generally detectable with kinase domains of both Class I and Class II SRKs. Chimeric constructs were made between the SRK910 kinase domain and the non-interacting Arabidopsis RLK5 kinase domain. Only one chimeric construct, SRR2, interacted with THL1 and THL2, while none of the chimeras were able to interact with ARC1. SRR2 is largely made up of RLK5 kinase domain with the N-terminal end being derived from the SRK910 kinase domain and was the only chimeric construct that retained kinase activity. Deletion or substitution of a conserved cysteine at the N-terminal end of the SRK910 kinase domain resulted in loss of interaction with THL1 and THL2, while the addition of this cysteine to a related receptor kinase, SFR1, conferred the ability to interact with the thioredoxin h proteins. In addition, substitution of the cysteines in the THL1 active site abolished the interaction. Lastly, the two Arabidopsis thioredoxin h clones most closely related to THL1 and THL2 were found to interact with the SRK kinase domains. Thus, the nature of the interaction of the thioredoxin h clones with SRK involves the reducing activity of these proteins and is restricted to the class of thioredoxin h proteins which have the variant CPPC active site. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

Further analysis of the interactions between the Brassica S receptor kinase and three interacting proteins (ARC1, THL1 and THL2) in the yeast two-hybrid system

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Publisher
Kluwer Academic Publishers
Copyright
Copyright © 2001 by Kluwer Academic Publishers
Subject
Life Sciences; Biochemistry, general; Plant Sciences; Plant Pathology
ISSN
0167-4412
eISSN
1573-5028
D.O.I.
10.1023/A:1006412329934
Publisher site
See Article on Publisher Site

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