Structure of an intermediate conformer of the spindle checkpoint protein Mad2
Abstract
The spindle checkpoint senses unattached kinetochores during prometaphase and inhibits the anaphase-promoting complex or cyclosome (APC/C), thus ensuring accurate chromosome segregation. The checkpoint protein mitotic arrest deficient 2 (Mad2) is an unusual protein with multiple folded states. Mad2 adopts the closed conformation (C-Mad2) in a Mad1–Mad2 core complex. In mitosis, kinetochore-bound Mad1–C-Mad2 recruits latent, open Mad2 (O-Mad2) from the cytosol and converts it to an intermediate conformer (I-Mad2), which can then bind and inhibit the APC/C activator cell division cycle 20 (Cdc20) as C-Mad2. In this paper, we report the crystal structure and NMR analysis of I-Mad2 bound to C-Mad2. Although I-Mad2 retains the O-Mad2 fold in crystal and in solution, its core structural elements undergo discernible rigid-body movements and more closely resemble C-Mad2. Residues exhibiting methyl chemical shift changes in I-Mad2 form a contiguous, interior network that connects its C-Mad2–binding site to the conformationally malleable C-terminal region. Mutations of residues at the I-Mad2–C-Mad2 interface hinder I-Mad2 formation and impede the structural transition of Mad2. Finally, our study provides insight into the conformational activation of Mad2 and establishes the basis of allosteric communication between two distal sites in Mad2.
- Authors:
-
- Univ. of Texas Southwestern Medical Center, Dallas, TX (United States). Dept. of Pharmacology
- Univ. of Texas Southwestern Medical Center, Dallas, TX (United States). Dept. of Biochemistry
- Univ. of Texas Southwestern Medical Center, Dallas, TX (United States). Dept. of Pharmacology. Howard Hughes Medical Inst.
- Publication Date:
- Research Org.:
- Univ. of Texas Southwestern Medical Center, Dallas, TX (United States)
- Sponsoring Org.:
- USDOE; National Inst. of Health (NIH) (United States); Welch Foundation (United States)
- OSTI Identifier:
- 1239415
- Grant/Contract Number:
- AC02-06CH11357; S10RR026461-01; I-1441; GM107415
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Volume: 112; Journal Issue: 36; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 60 APPLIED LIFE SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; mitosis; conformational change; allostery; NMR; X-ray crystallography
Citation Formats
Hara, Mayuko, Özkan, Engin, Sun, Hongbin, Yu, Hongtao, and Luo, Xuelian. Structure of an intermediate conformer of the spindle checkpoint protein Mad2. United States: N. p., 2015.
Web. doi:10.1073/pnas.1512197112.
Hara, Mayuko, Özkan, Engin, Sun, Hongbin, Yu, Hongtao, & Luo, Xuelian. Structure of an intermediate conformer of the spindle checkpoint protein Mad2. United States. https://doi.org/10.1073/pnas.1512197112
Hara, Mayuko, Özkan, Engin, Sun, Hongbin, Yu, Hongtao, and Luo, Xuelian. Mon .
"Structure of an intermediate conformer of the spindle checkpoint protein Mad2". United States. https://doi.org/10.1073/pnas.1512197112. https://www.osti.gov/servlets/purl/1239415.
@article{osti_1239415,
title = {Structure of an intermediate conformer of the spindle checkpoint protein Mad2},
author = {Hara, Mayuko and Özkan, Engin and Sun, Hongbin and Yu, Hongtao and Luo, Xuelian},
abstractNote = {The spindle checkpoint senses unattached kinetochores during prometaphase and inhibits the anaphase-promoting complex or cyclosome (APC/C), thus ensuring accurate chromosome segregation. The checkpoint protein mitotic arrest deficient 2 (Mad2) is an unusual protein with multiple folded states. Mad2 adopts the closed conformation (C-Mad2) in a Mad1–Mad2 core complex. In mitosis, kinetochore-bound Mad1–C-Mad2 recruits latent, open Mad2 (O-Mad2) from the cytosol and converts it to an intermediate conformer (I-Mad2), which can then bind and inhibit the APC/C activator cell division cycle 20 (Cdc20) as C-Mad2. In this paper, we report the crystal structure and NMR analysis of I-Mad2 bound to C-Mad2. Although I-Mad2 retains the O-Mad2 fold in crystal and in solution, its core structural elements undergo discernible rigid-body movements and more closely resemble C-Mad2. Residues exhibiting methyl chemical shift changes in I-Mad2 form a contiguous, interior network that connects its C-Mad2–binding site to the conformationally malleable C-terminal region. Mutations of residues at the I-Mad2–C-Mad2 interface hinder I-Mad2 formation and impede the structural transition of Mad2. Finally, our study provides insight into the conformational activation of Mad2 and establishes the basis of allosteric communication between two distal sites in Mad2.},
doi = {10.1073/pnas.1512197112},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 36,
volume = 112,
place = {United States},
year = {Mon Aug 24 00:00:00 EDT 2015},
month = {Mon Aug 24 00:00:00 EDT 2015}
}
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