Vm. Bolanosgarcia et al., STABILITY OF THE C-TERMINAL PEPTIDE OF CETP MEDIATED THROUGH AN (I, I+4) ARRAY, Biochimica et biophysica acta. Protein structure and molecular enzymology, 1384(1), 1998, pp. 7-15
Based on circular dichroism (CD), we have found an essential (i, i + 4
) alpha-helix stabilizing array in the C-terminus region for the chole
steryl ester transfer protein (CETP) between histidine 466 and asparti
c acid 470. This region apparently corresponds to an amphipathic alpha
-helix. The behavior of this peptide in solution in comparison with a
mutant peptide (D470N) was also analyzed by dynamic light scattering (
DLS). The results showed that alpha-helix stabilization is not due to
peptide aggregation. The thermodynamic estimation of stability support
s the idea that the phenomenon is carried out through an (i, i + 4) ar
ray. The representation of the C-terminal region as an amphipathic alp
ha-helical peptide shows that lipid-binding activity might be in part
due to both the asymmetric polar/non-polar residue distribution and to
the presence of an (i, i + 4) array important for helix stability. (C
) 1998 Elsevier Science B.V.