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hairpin loop, are consistent with a right-handed A-form-like helix. Comparisons between NMR spectra and molecular dynamics (MD) simulations suggest that recent reparametrizations, parm99χ_YIL and parm99TOR, of the AMBER parm99 force field improve the agreement between structural features for C4 determined

contacts of 13 nonhomologous high-resolution struc-tures of membrane channels and transporters are mainly accomplished by weakly polar amino acids (G> S> T> F) that preferably create contacts every fourth residue, typical for right-handed helix cross-ings. There is a strong correlation between

; α/β scaffold, an architectural motif in which an helical structure is connected to a β-sheet by two disulfide bridges; 310, right-handed helix of the 310 type (3 amino acid residues per turn of helix); α, right-handed helix of the 3.613 type (3.6 amino acid residues per turn of helix) also termed α-helix

-Pro in longer segments of right-handed a-helix. This is achieved due to minor variations in some of the internal parameters. Deviations in the backbone parameters of proline in the right-handed a-helix lead to a kink of about 23 " in the helix axis. These deviations have been characterized and a set

back to Figure 1C, this means that one will produce plane polarised light from a right-hand helix, and the other from a left-hand helix. This accounts for the animals ’ ability to distinguish right-hand and left-hand polarised light. In scarab beetles, the highly coloured left-hand circularly polarised

= 14.1 + 0.2 nm and b-- 3.9 + 0.1 nm in projection. Shadowing indicated that the tube wall was ~7 nm thick and that the sheets from which it was formed followed a right-handed helix. Superposition of the lattices from the top and bottom of the tube produced a moire pattern in negatively stained

-start right-handed helix with a 288-nm rise; the central pair makes a shallow left-handed twist. The spoke heads are shown to be made up of four major subunits; two bind to the spoke shaft and two bind to a pair of central-sheath projections. Most motile cilia contain outer and inner dynein arms, radial

water activity due to the high alkali salt concentration ^ we also show that the CD spectrum obtained in presence of Cs * ions and characterized by a negative band at 275 nra, cannot be interpreted in terms of Z-like left-handed helix but reflects a modified B right-handed helix.

on the available backbone conformations. These results are supported by semi-empirical quantum mechanical calculations and coincide qualitatively with simple steric considerations. They suggest that an octamer of (S)-N-(1-phenylethyl)glycine should form a right-handed helix with cis amide bonds, similar