1S35: Crystal Structure Of Repeats 8 And 9 Of Human Erythroid Spectrin

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.
PDB ID: 1S35Download
MMDB ID: 27386
PDB Deposition Date: 2004/1/12
Updated in MMDB: 2012/10
Experimental Method:
x-ray diffraction
Resolution: 2.4  Å
Source Organism:
Similar Structures:
Biological Unit for 1S35: monomeric; determined by author
Molecular Components in 1S35
Label Count Molecule
Protein (1 molecule)
Spectrin Beta Chain, Erythrocyte(Gene symbol: SPTB)
Molecule annotation
Chemicals (2 molecules)
* Click molecule labels to explore molecular sequence information.

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