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Crystallographic Studies of the Cerebral Cavernous Malformations Proteins

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Part of the Methods in Molecular Biology book series (MIMB, volume 2152)

Abstract

Cerebral cavernous malformations (CCM) are dysplasias that primarily occur in the neurovasculature, and are associated with mutations in three genes: KRIT1, CCM2, and PDCD10, the protein products of which are KRIT1 (Krev/Rap1 Interaction Trapped 1; CCM1, cerebral cavernous malformations 1), CCM2 (cerebral cavernous malformations 2; OSM, osmosensing scaffold for MEKK3), and CCM3 (cerebral cavernous malformations 3; PDCD10, programmed cell death 10). Until recently, these proteins were relatively understudied at the molecular level, and only three folded domains were documented. These were a band 4.1, ezrin, radixin, moesin (FERM), and an ankyrin repeat domain (ARD) in KRIT1, and a phosphotyrosine-binding (PTB) domain in CCM2. Over the past 10 years, a crystallographic approach has been used to discover a series of previously unidentified domains within the CCM proteins. These include a non-functional Nudix (or pseudonudix) domain in KRIT1, a harmonin homology domain (HHD) in CCM2, and dimerization and focal adhesion targeting (FAT)-homology domains within CCM3. Many of the roles of these domains have been revealed by structure-guided studies that show the CCM proteins can directly interact with one another to form a signaling scaffold, and that the “CCM complex” functions in signal transduction by interacting with other binding partners, including ICAP1, RAP1, and MEKK3. In this chapter, we describe the crystallization of CCM protein domains alone, and with their interaction partners.

Key words

CCM proteins X-ray crystallography Protein purification KRIT1 CCM2 CCM3 ICAP1 RAP1 MEKK3 

Notes

Acknowledgments

We wish to thank Amy Stiegler Wyler, Byunghak Ha, and David Calderwood for helpful discussions. This work is funded by National Institutes of Health grants R01GM114621 and R01NS085078 to TJB.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2020

Authors and Affiliations

  1. 1.Department of PharmacologyYale Cancer Center, Yale University School of MedicineNew HavenUSA
  2. 2.Department of ChemistryLehigh UniversityBethlehemUSA
  3. 3.Abcam Inc.BranfordUSA
  4. 4.MOE Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of ChinaQingdaoChina
  5. 5.Laboratory for Marine Biology and BiotechnologyQingdao National Laboratory for Marine Science and TechnologyQingdaoChina
  6. 6.Department of Molecular Biophysics and BiochemistryYale Cancer Center, Yale University School of MedicineNew HavenUSA

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