Helices

Some articles on helices:

Phenylalanine Ammonia-lyase - Enzyme Structure
... Phenylalanine ammonia lyase is composed of four identical subunits composed mainly of alpha-helices, with pairs of monomers forming a single active site ... Catalysis in PAL may be governed by the dipole moments of seven different alpha helices associated with the active site ... the electrophilic group MIO non-covalently bonded to three helices ...
Helix
... A helix (pl helixes or helices) is a type of smooth space curve, i.e ... Helices are important in biology, as the DNA molecule is formed as two intertwined helices, and many proteins have helical substructures, known as alpha helices ...
Pi Helix
... Although thought to be rare, π-helices are actually found in 15% of known protein structures and are believed to be an evolutionary adaptation derived by the insertion of a single amino acid into an α-helix ... Because such insertions are highly destabilizing, the formation of π-helices would tend to be selected against unless it provided some functional advantage to the protein ... π-helices therefore are typically found near functional sites of proteins ...
How SOSUI Works
... First of all, SOSUI looks for α helices that are relatively easy to predict, taking into account the known helical potentials of the given amino acid sequence(AAS) ... The much more difficult task is to differentiate between the α helices in soluble proteins and the ones in transmembrane proteins, the α helix being ... SOSUI then looks for accumulations of amphiphilic AAs at the ends of α helices, which seems to be typical for transmembrane α helices (it makes the transmembrane position the energetically best one ...
Transaldolase B - Structure
... similar to other class I aldolases, made up of eight parallel β-sheets and seven α-helices ... There are also seven additional α-helices that are not part of the barrel ... the β-sheets in the barrel and the surrounding α-helices to contribute to packing, such as the area containing Leu-168, Phe-170, Phe-189, Gly-311, and Phe-315 ...