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Title: Structural analysis of the KRIT1 ankyrin repeat and FERM domains reveals a conformationally stable ARD-FERM interface

Cerebral cavernous malformations (CCM) are vascular dysplasias that usually occur in the brain and are associated with mutations in the KRIT1/CCM1, CCM2/MGC4607/OSM/Malcavernin, and PDCD10/CCM3/ TFAR15 genes. Here we report the 2.9 Å crystal structure of the ankyrin repeat domain (ARD) and FERM domain of the protein product of KRIT1 (KRIT1; Krev interaction trapped 1). The crystal structure reveals that the KRIT1 ARD contains 4 ankyrin repeats. There is also an unusual conformation in the ANK4 repeat that is stabilized by Trp-404, and the structure reveals a solvent exposed ankyrin groove. Domain orientations of the three copies within the asymmetric unit suggest a stable interaction between KRIT1 ARD and FERM domains, indicating a globular ARD–FERM module. It resembles the additional F0 domain found N-terminal to the FERM domain of talin. Structural analysis of KRIT1 ARD–FERM highlights surface regions of high evolutionary conservation, and suggests potential sites that could mediate interaction with binding partners. The structure therefore provides a better understanding of KRIT1 at the molecular level.
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  1. Yale Univ., New Haven, CT (United States)
Publication Date:
OSTI Identifier:
DOE Contract Number:
P41GM103403 (NE-CAT); R01NS085078
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Structural Biology; Journal Volume: 192; Journal Issue: 3
Research Org:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org:
USDOE; National Institutes of Health, New York, NY (United States)
Country of Publication:
United States
crystal structure; X-ray crystallography; Ankyrin repeat; protein complex; cerebral cavernous malformations