Fig. 3.
X-ray crystal structure of PCDH1 EC1-4. a Topology diagram of PCDH1 EC1-4bc. A typical cadherin fold is observed for each EC repeat with seven β-strands labeled A to G. Calcium ions are shown as green circles. Dashed lines are missing loops. b Ribbon diagram of PCDH1 EC1-4bc (6BX7). Black dashed boxes indicate unique features of PCDH1 EC1-4 highlighted in panels c–e. c Details of a disulfide loop in EC1 (arrow). d Details of the calcium-binding site in the EC2–EC3 linker region. e Details of an extended δ insertion within β-strand A in EC4 not seen in clustered protocadherins (arrow)