RT Journal Article
T1 Micelle-triggered beta-hairpin to alpha-helix transition in a 14-residue peptide from a choline-binding repeat of the pneumococcal autolysin LytA
A1 Zamora-Carreras, H.
A1 Maestro García-Donas, María Beatriz
A1 Strandberg, E.
A1 Ulrich, A. S.
A1 Sanz, J. M.
A1 Jiménez, M. A.
AB Choline-binding modules (CBMs) have a ββ-solenoid structure composed of choline-binding repeats (CBR), which consist of a β-hairpin followed by a short linker. To find minimal peptides that are able to maintain the CBR native structure and to evaluate their remaining choline-binding ability, we have analysed the third β-hairpin of the CBM from the pneumococcal LytA autolysin. Circular dichroism and NMR data reveal that this peptide forms a highly stable native-like β-hairpin both in aqueous solution and in the presence of trifluoroethanol, but, strikingly, the peptide structure is a stable amphipathic α-helix in both zwitterionic (dodecylphosphocholine) and anionic (sodium dodecylsulfate) detergent micelles, as well as in small unilamellar vesicles. This β-hairpin to α-helix conversion is reversible. Given that the β-hairpin and α-helix differ greatly in the distribution of hydrophobic and hydrophilic side chains, we propose that the amphipathicity is a requirement for a peptide structure to interact and to be stable in micelles or lipid vesicles. To our knowledge, this "chameleonic" behaviour is the only described case of a micelle-induced structural transition between two ordered peptide structures.
PB Wiley
SN 0947-6539
YR 2015
FD 2015-05-26
LK https://hdl.handle.net/20.500.14352/92617
UL https://hdl.handle.net/20.500.14352/92617
LA eng
NO Ministerio de Economía, Industria y Competitividad (MINECO)
NO German Helmholtz Association
DS Docta Complutense
RD 16 abr 2025