Histidine

Photograph of Histidine under the microscope.

Histidine is one of the basic (with reference to pH) amino acids due to its aromatic nitrogen-heterocyclic imidazole side chain. This amino acid is biochemically metabolized into the neurotransmitter histamine and the set of genes that produce the enzymes responsible for histidine biosynthesis are controlled by the well-studied histidine operon. The disruption of histidine biosynthesis in bacteria is the basis for the famous Ames test, used to determine the mutagenability of various chemicals. Histidine is incorporated into proteins and enzymes at a molar percentage of 2.1 compared to the other amino acids.

© 1995-2013 by Michael W. Davidson and The Florida State University. All Rights Reserved. No images, graphics, software, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
This website is maintained by our
Graphics & Web Programming Team
in collaboration with Optical Microscopy at the
National High Magnetic Field Laboratory.
Last modification: Thursday, Mar 04, 2004 at 02:02 PM
Access Count Since April 11, 1998: 54999