Exempel på helix

• Effect of a triplex-binding ligand on parallel and antiparallel triple helices using short unmodified and arcidine-linked oligonucleotides.

• The component helices might be held together only by the continuity of the strands, or they might undergo pairwise coaxial stacking.

• The outer surface is formed by a -hairpin and two helices.

• The catalytic subunit has an overall -helical structure containing five helices.

• At # low salt concentration the junction is extended, with no stacking of helices.

• As with the other structures, the junction is a right-handed antiparallel cross of pairwise, coaxially stacked helices.

• The dynamic programming methods predict a larger proportion of long range helices than actually occur.

• Isolated base pairs are usually unstable ; hence, helices usually consist of at least two pairs.

• In this model, the amphipathic peptide helices associate to form a bundle, which resembles a barrel composed of helices as staves.

• Sensor domains were identified as the segment between predicted transmembrane helices associated with histidine kinase domains.

• Thus, fusion between double helices can occur between strands of the same polarity or of opposite polarity.

• The inner wall of the complex is formed by the 9 a-apoprotein helices.

• The peptides are 20 and 23 residues long respectively and are predicted to form amphipathic helices.

• In the latter cases, the coupling efficiency will depend on the nature of the interactions between helices.

• A mean of 81 % of the welldetermined helices are present in the comparative structure.