Title : Hyperactivity of the Arabidopsis cryptochrome (cry1) L407F mutant is caused by a structural alteration close to the cry1 ATP-binding site.

Pub. Date : 2017 Aug 4

PMID : 28634231






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1 Hyperactivity of the Arabidopsis cryptochrome (cry1) L407F mutant is caused by a structural alteration close to the cry1 ATP-binding site. Adenosine Triphosphate cryptochrome 1 Arabidopsis thaliana
2 Hyperactivity of the Arabidopsis cryptochrome (cry1) L407F mutant is caused by a structural alteration close to the cry1 ATP-binding site. Adenosine Triphosphate cryptochrome 1 Arabidopsis thaliana
3 The previously characterized L407F mutant allele of Arabidopsis cry1 is biologically hyperactive and seems to mimic the ATP-bound state of cry1, but the reason for this phenotypic change is unclear. Adenosine Triphosphate cryptochrome 1 Arabidopsis thaliana
4 The previously characterized L407F mutant allele of Arabidopsis cry1 is biologically hyperactive and seems to mimic the ATP-bound state of cry1, but the reason for this phenotypic change is unclear. Adenosine Triphosphate cryptochrome 1 Arabidopsis thaliana
5 Here, we show that cry1L407F can still bind ATP, has less pronounced photoreduction and formation of FADH than wild-type cry1, and has a dark reversion rate 1.7 times lower than that of the wild type. Adenosine Triphosphate cryptochrome 1 Arabidopsis thaliana
6 Moreover, we show that ATP binds to cry1 in both the dark and the lit states. Adenosine Triphosphate cryptochrome 1 Arabidopsis thaliana
7 Finally, we show that a recently discovered chemical inhibitor of cry1, 3-bromo-7-nitroindazole, competes for ATP binding and thereby diminishes FADH formation, which demonstrates that both processes are important for cry1 function. Adenosine Triphosphate cryptochrome 1 Arabidopsis thaliana
8 Finally, we show that a recently discovered chemical inhibitor of cry1, 3-bromo-7-nitroindazole, competes for ATP binding and thereby diminishes FADH formation, which demonstrates that both processes are important for cry1 function. Adenosine Triphosphate cryptochrome 1 Arabidopsis thaliana