alpha helix

noun

, Biochemistry.

1. the rodlike spatial configuration of many protein molecules in which the polypeptide backbone is stabilized by hydrogen bonds between amino acids in successive helical turns.

alpha helix

noun

1. biochem a helical conformation of a polypeptide chain, found abundantly in the structure of proteins

alpha helix

1. A common structure of proteins, characterized by a single, spiral chain of amino acids stabilized by hydrogen bonds.
2. Compare beta sheet

Word History and Origins

Origin of alpha helix¹

First recorded in 1950–55

Example Sentences

One common feature is a spiral stretch of amino acids called an alpha helix.

From New York Times

It seemed almost unbelievable that the DNA structure was solved, that the answer was incredibly exciting, and that our names would be associated with the double helix as Pauling’s was with the alpha helix.

From Literature

Every spiraling alpha helix, every knobby amino acid, all the nooks and crannies.

From Slate

At just 125 feet long, the Alpha Helix could carry only 15 scientists and was undersized for the waters where crab fishermen of "Deadliest Catch" earn their money.

From US News

The Sikuliaq, built by Marinette Marine Corp. in Marinette, Wisconsin, has berths for 26 researchers, a crew of 20, and features lacking on the Alpha Helix.

From US News