Abstract
PW2 is an anticoccidial peptide active against Eimeria acervulina and Eimeria tenella. We determined the structure of PW2 in dodecylphosphocholine micelles. The structure showed two distinct regions: an amphipathic N-terminal 310 helix and an aromatic region containing WWR interface-binding motif. The aromatic region acted as a scaffold of the protein in the interface and shared the same structure in both DPC and SDS micelles. N-terminal helix interacted with DPC but not with SDS interface. Chemical shift change was slow when SDS was added to PW2 in DPC and fast when DPC was added to PW2 in SDS, indicating that interaction with DPC micelles was kinetically more stable than with SDS micelles. Also, DPC interface was able to accommodate PW2, but it maintained the conformational arrangement in the aromatic region observed for SDS micelles. This behavior, which is different from that observed for other antimicrobial peptides with WWR motif, may be associated with the absence of PW2 antibacterial activity and its selectivity for Eimeria parasites.
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Acknowledgements
This work was supported by CNPq, CNPq/PRONEX, FAPERJ and ICGEB-RELAB-OPS. We thank Monica Santos de Freitas for assistance with the fluorescence measurements and Catarina A. Miyamoto and Gisele C. Amorim for revising the manuscript.
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Tinoco, L.W., Gomes-Neto, F., Valente, A.P. et al. Effect of micelle interface on the binding of anticoccidial PW2 peptide. J Biomol NMR 39, 315–322 (2007). https://doi.org/10.1007/s10858-007-9202-6
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DOI: https://doi.org/10.1007/s10858-007-9202-6