Alpha helix - Wikipedia
An alpha helix (or α-helix) is a sequence of amino acids in a protein that are twisted into a coil (a helix). The alpha helix is the most common structural arrangement in the secondary structure of proteins.
Secondary Structure: α-Helices - Chemistry LibreTexts
An α-helix is a right-handed coil of amino-acid residues on a polypeptide chain, typically ranging between 4 and 40 residues. This coil is held together by hydrogen bonds between the oxygen of C=O on top coil and the hydrogen of N-H on the bottom coil.
Helix - Wikipedia
A helix (/ ˈ h iː l ɪ k s /; pl. helices) is a shape like a cylindrical coil spring or the thread of a machine screw. It is a type of smooth space curve with tangent lines at a constant angle to a fixed axis.
4.3: Secondary Structure - Biology LibreTexts
2021年8月23日 · Secondary structures are those repetitive structures involving H bond between amide H and carbonyl O in- the main chain. These include alpha helices, beta strands (sheets) and reverse turns. Figure: Right Handed Alpha helices - image made with VMD.
Alpha-Helix - an overview | ScienceDirect Topics
The α-helix is the structural element most frequently used for sequence-specific interactions in protein–DNA interfaces. The size of an α-helix matches the width of the DNA major groove, allowing them to fit together tightly while the protein side chains on the helix probe the available base-pair functional groups. The mode of helix docking ...
Secondary Structure (2˚) -- Alpha Helices - University of Vermont
An alpha helix is an element of secondary structure in which the amino acid chain is arranged in a spiral. The kinemage linked above shows an individual alpha helix, viewed from the N-terminal end to resemble the "helical wheel" (see figure below).
4.2: Secondary Structure and Loops - Biology LibreTexts
There are three major types of helices in proteins, the alpha helix (n = 3.6), 3 10 helix (n = 3) and the pi helix (n = 4.4). Note that n is most commonly not an integer. The alpha helix is the most common type of helix.
Alpha helix - Proteopedia, life in 3D
2023年7月9日 · When an alpha helix runs along the surface of the protein, one side of it will show polar side chains (solvent accessible) while the other side will show non-polar side chains (part of the hydrophobic core). The alpha helix fits nicely into the major groove of DNA.
Structure and Stability of the α-Helix | SpringerLink
Here we discuss structural features that are important for designing peptide helices, including amino acid preferences for interior and terminal positions, side chain interactions, disulfide bonding, metal binding, and phosphorylation.
5.13: Macromolecular Structures- Alpha-Helices
Alpha helices are a common structural motif in proteins. Alpha helices are chiral; a mirror-image form is possible. The shape of the alpha-helix is rooted in the shape of the L-amino acids that compose the protein.
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