p31comet blocks Mad2 activation through structural mimicry.Yang, M., Li, B., Tomchick, D.R., Machius, M., Rizo, J., Yu, H., Luo, X.
(2007) Cell 131: 744-755
- PubMed: 18022368
- DOI: 10.1016/j.cell.2007.08.048
- Primary Citation of Related Structures:
- PubMed Abstract:
- The Mad2 spindle checkpoint protein has two distinct
natively folded states.
Luo, X., Tang, Z., Xia, G., Wassmann, K., Matsumoto, T., Rizo, J., Yu, H.
(2004) Nat Struct Mol Biol 11: 338
- The Mad2 Spindle Checkpoint Protein Undergoes
Similar Major Conformational Changes
Upon Binding to Either Mad1 or Cdc20
Luo, X., Tang, Z., Rizo, J., Yu, H.
(2002) Mol Cell 9: 59
- Structure of the Mad2 spindle assembly checkpoint
protein and its interaction with Cdc20.
Luo, X., Fang, G., Coldiron, M., Lin, Y., Yu, H., Kirschner, M.W., Wagner, G.
(2000) Nat Struct Mol Biol 7: 224
The status of spindle checkpoint signaling depends on the balance of two opposing dynamic processes that regulate the highly unusual two-state behavior of Mad2. In mitosis, a Mad1-Mad2 core complex recruits cytosolic Mad2 to kinetochores through Mad2 dim ...
The status of spindle checkpoint signaling depends on the balance of two opposing dynamic processes that regulate the highly unusual two-state behavior of Mad2. In mitosis, a Mad1-Mad2 core complex recruits cytosolic Mad2 to kinetochores through Mad2 dimerization and converts Mad2 to a conformer amenable to Cdc20 binding, thereby facilitating checkpoint activation. p31(comet) inactivates the checkpoint through binding to Mad1- or Cdc20-bound Mad2, thereby preventing Mad2 activation and promoting the dissociation of the Mad2-Cdc20 complex. Here, we report the crystal structure of the Mad2-p31(comet) complex. The C-terminal region of Mad2 that undergoes rearrangement in different Mad2 conformers is a major structural determinant for p31(comet) binding, explaining the specificity of p31(comet) toward Mad1- or Cdc20-bound Mad2. p31(comet) adopts a fold strikingly similar to that of Mad2 and binds at the dimerization interface of Mad2. Thus, p31(comet) exploits the two-state behavior of Mad2 to block its activation by acting as an "anti-Mad2."
Department of Pharmacology, The University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390, USA.