alpha helix


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

alpha helix

[′al·fə ′hē·liks]
(cell and molecular biology)
A spatial configuration of the polypeptide chains of proteins in which the chain assumes a helical form, 0.54 nanometer in pitch, 3.6 amino acids per turn, presenting the appearance of a hollow cylinder with radiating side groups.
Mentioned in ?
References in periodicals archive ?
The secondary protein structure a polypeptide is the small part and polypeptide sequence, curls up into an alpha helix or beta pleated sheets.
Plots generated in this study clearly indicate that there are geometric shifts in the polypeptides as a function of the form in which they are minimized, and compares polyalanines with 50 residues for a sheeted structure (five parallel sheets), an alpha helix and a beta helix, with the alpha structure showing the widest range of angles.
Together, Watson and Crick aspired to solve the structure of DNA by model building, just as Pauling had done for the alpha helix in proteins.
My new awakening led me to Alaska again for a solo springtime trek, 75 miles over the Resurrection Pass from a town called Hope on the Turnagain Arm of the Cook Inlet (near Anchorage) to Seward, the home port of the R/V Alpha Helix, near Prince William Sound.
Each turn of a beta helix consists of three beta segments, with 22 amino acids per turn, so the structure is about five times as wide as an alpha helix.
The grubby sculpin protein has a tight spiral structure known as an alpha helix.
Some of the companies in the portfolio are A Brand New World, Alpha Helix, Arcticon BioPharm Production, Artema, A3TL, Chemel, European Institute of Science, Fingerprint Cards, FreeHand Communication, InfiniCom, Mainbox, Mocat, Musicbrigade, Naty, Netbaby World, Picron Microarrays, RaySearch Laboratories, RSC Technology, Samba Sensors, SWATS, Webupdate Scandinavia, Widermind, Wireless Assets, Inc.
a world leader in genomics and post-genomics technologies, today announced the closure of a two-year renewable exclusive agreement with Alpha Helix AB (Uppsala, Sweden), a leader in reagent management systems, to market a novel cloning kit that combines the most accurate and error-proof cloning technology, Genomics One's TrueBlue(R) Technology, with Alpha Helix's revolutionary liquid dispensing system, MicroCartridge(TM).