left-handed helix in English dictionary

  • left-handed helix

Sample sentences with "left-handed helix"

We know today that DNA, the most basic nucleic acid, takes the form of a left-handed helix.
Can anyone tell me the difference between the right and the left-handed helix?
Dunitz describes how Pauling's first article on the theme in fact shows a left-handed helix, the enantiomer of the true structure.
A- and B-DNA are very similar, forming right-handed helices, whereas Z-DNA is a left-handed helix with a zig-zag phosphate backbone.
The equivalent left-handed helix can be constructed in a number of ways, the simplest being to negate any one of the x, y or z components.
In 2007, the RNA version of Z-DNA, Z-RNA, was described as a transformed version of an A-RNA double helix into a left-handed helix.
A negatively supercoiled DNA molecule will produce either a one-start left-handed helix, the toroid, or a two-start right-handed helix with terminal loops, the plectoneme.
Short pieces of left-handed helix sometimes occur with a large content of achiral glycine amino acids, but are unfavorable for the other normal, biological L-amino acids.
It is approximately 300 nm long and 1.5 nm in diameter, and it is made up of three polypeptide strands (called alpha peptides, see step 2), each of which has the conformation of a left-handed helix – this should not be confused with the right-handed alpha helix.
R residues have negative phi values (as in right-handed alpha-helices) and L residues have positive phi values (as in the left-handed alpha helix).
A long left-handed π-helix is unlikely to be observed in proteins because, among the naturally occurring amino acids, only glycine is likely to adopt positive φ dihedral angles such as 55°.
The torsion is positive for a right-handed helix and is negative for a left-handed one.
SST accurately delineates any protein chain into regions associated with the following assignment types: E = (Extended) strand of a β-pleated sheet G = Right-handed 310 helix H = Right-handed α-helix I = Right-handed π-helix g = Left-handed 310 helix h = Left-handed α-helix i = Left-handed π-helix 3 = 310-like Turn 4 = α-like Turn 5 = π-like Turn T = Unspecified Turn C = Coil - = Unassigned residue SST detects π and 310 helical caps to standard α-helices, and automatically assembles the various extended strands into consistent β-pleated sheets.
The Z-DNA helix is left-handed and has a structure that repeats every other base pair.
(Right-handed) SCOP family of right-handed β-helices SCOP family of left-handed β-helices CATH β-helix protein family
It is a left-handed double helical structure in which the helix winds to the left in a zigzag pattern (instead of to the right, like the more common B-DNA form).
Folding a sequence with this repeating pattern into an alpha-helical secondary structure causes the hydrophobic residues to be presented as a 'stripe' that coils gently around the helix in left-handed fashion, forming an amphipathic structure.
These three left-handed helices are twisted together into a right-handed triple helix or "super helix", a cooperative quaternary structure stabilized by many hydrogen bonds.
Scientifically, it is called “arthrospeira” because it is composed of many cells that form filaments, characterized by cylindrical, multicellular trichomes in an open left-hand helix or spiral.
Handedness (or chirality) is a property of the helix, not of the perspective: a right-handed helix cannot be turned to look like a left-handed one unless it is viewed in a mirror, and vice versa.

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