1S35 : Crystal Structure of Repeats 8 and 9 of Human Erythroid Spectrin

  • Hideki Kusunoki (Contributor)
  • Ruby I. MacDonald (Contributor)
  • Alfonso Mondragon (Contributor)



Experimental Technique/Method:X-RAY DIFFRACTION
Release Date:2004-04-20
Deposition Date:2004-01-12
Revision Date:2008-04-29#2011-07-13
Molecular Weight:24461.93
Macromolecule Type:Protein
Residue Count:214
Atom Site Count:1689

Erythroid spectrin, a major component of the cytoskeletal network of the red cell which contributes to both the stability and the elasticity of the red cell membrane, is composed of two subunits, alpha and beta, each formed by 16-20 tandem repeats. The properties of the repeats and their relative arrangement are thought to be key determinants of spectrin flexibility. Here we report a 2.4 A resolution crystal structure of human erythroid beta-spectrin repeats 8 and 9. This two-repeat fragment is unusual as it exhibits low stability of folding and one of its repeats lacks two tryptophans highly conserved among spectrin repeats. Two key factors responsible for the lower stability and, possibly, its flexibility, are revealed by the structure. A third novel feature of the structure is the relative orientation of the two repeats, which increases the range of possible conformations and provides new insights into atomic models of spectrin flexibility.
Date made available2004

Cite this