TY - JOUR
T1 - Novel ATP-binding and autophosphorylation activity associated with Arabidopsis and human cryptochrome-1
AU - Bouly, Jean Pierre
AU - Giovani, Baldissera
AU - Djamei, Armin
AU - Mueller, Markus
AU - Zeugner, Anke
AU - Dudkin, Elizabeth A.
AU - Batschauer, Alfred
AU - Ahmad, Margaret
PY - 2003/7
Y1 - 2003/7
N2 - Cryptochromes are blue-light photoreceptors sharing sequence similarity to photolyases, a class of flavoenzymes catalyzing repair of UV-damaged DNA via electron transfer mechanisms. Despite significant amino acid sequence similarity in both catalytic and cofactor-binding domains, cryptochromes lack DNA repair functions associated with photolyases, and the molecular mechanism involved in cryptochrome signaling remains obscure. Here, we report a novel ATP binding and autophosphorylation activity associated with Arabidopsis cryl protein purified from a baculovirus expression system. Autophosphorylation occurs on serine residue(s) and is absent in preparations of cryptochrome depleted in flavin and/or misfolded. Autophosphorylation is stimulated by light in vitro and oxidizing agents that act as flavin antagonists prevent this stimulation. Human cryl expressed in baculovirus likewise shows ATP binding and autophosphorylation activity, suggesting this novel enzymatic activity may be important to the mechanism of action of both plant and animal cryptochromes.
AB - Cryptochromes are blue-light photoreceptors sharing sequence similarity to photolyases, a class of flavoenzymes catalyzing repair of UV-damaged DNA via electron transfer mechanisms. Despite significant amino acid sequence similarity in both catalytic and cofactor-binding domains, cryptochromes lack DNA repair functions associated with photolyases, and the molecular mechanism involved in cryptochrome signaling remains obscure. Here, we report a novel ATP binding and autophosphorylation activity associated with Arabidopsis cryl protein purified from a baculovirus expression system. Autophosphorylation occurs on serine residue(s) and is absent in preparations of cryptochrome depleted in flavin and/or misfolded. Autophosphorylation is stimulated by light in vitro and oxidizing agents that act as flavin antagonists prevent this stimulation. Human cryl expressed in baculovirus likewise shows ATP binding and autophosphorylation activity, suggesting this novel enzymatic activity may be important to the mechanism of action of both plant and animal cryptochromes.
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U2 - 10.1046/j.1432-1033.2003.03691.x
DO - 10.1046/j.1432-1033.2003.03691.x
M3 - Article
C2 - 12846824
AN - SCOPUS:0038375339
SN - 0014-2956
VL - 270
SP - 2921
EP - 2928
JO - European Journal of Biochemistry
JF - European Journal of Biochemistry
IS - 14
ER -