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Figure 3
Protein–PEG–calixarene interfaces. The protein–calixarene interfaces are completed by a PEG fragment in (a) PAF–sclx6 and (b) PAF–sclx8. Lys9 Nζ simultaneously forms ion–dipole bonds to the PEG (crown-ether-like complex) and a salt bridge to one sulfonate. CH—π and lone-pair—π bonds also occur between PEG and the calixarene phenolic rings.

IUCrJ
Volume 6| Part 2| March 2019| Pages 238-247
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519000411