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Papers In Press, published online ahead of print September 10, 2001
Dept. Molecular & Developmental Biology, Inst. Medical Science, Tokyo University, Tokyo 108-8639
Corresponding Author: sumiko{at}ims.u-tokyo.ac.jp
Box1 and 2 (box1/2) are conserved cytoplasmic motifs located in the membrane proximal region of cytokine receptors, including the human GM-CSF receptor common bc. Deletion of box1/2 abrogated all the examined activities of GM-CSF, and this phenomenon is explained by the loss of binding by Jak2. To test if a molecule other than Jak2 interacting with the box1/2 region plays a role in GM-CSF receptor signal transduction, we screened for molecules interacting with the box1/2 region by a pull-down assay using recombinant purified protein of GST fused with the bc box1/2 region and a Ba/F3 cell lysate. The mouse homologue of Mad2 protein, which plays an important role in the M phase of the cell cycle, was revealed to associate with the box1/2 region specifically. Peptides corresponding to the box1 sequence also bound to Mad2, and mutation of the box1 decreased the Mad2 interaction. Deletion analysis indicated that interaction with box1/2 occurred through the C-terminal portion of Mad2. Mad2 is known to change affinity for binding partners cell cycle dependently. Binding affinity of Mad2 to box1/2 increased in the late M phase, suggesting the possibility that GM-CSF participates in regulation of the M phase check point through interaction with Mad2.
J. Biol. Chem, 10.1074/jbc.M101488200
Submitted on February 16, 2001
Revised on September 7, 2001
Accepted on September 7, 2001
Cell cycle-dependent interaction of Mad2 with conserved box1/2 region of hGM-CSF receptor common bc
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