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Structure of the pleckstrin homology domain from beta-spectrin.

The 'pleckstrin homology' or PH domain is a 100-residue protein module. It is present in many kinases, different isoforms of phospholipase C, GTPase-activating proteins and nucleotide-exchange factors. Its function is not known, but many proteins that contain a PH domain interact with GTP-binding proteins. The PH domain in beta-adrenergic receptor kinase may be involved in binding to the beta gamma subunits of a trimeric G-protein. We report here the three-dimensional structure of the PH domain of the cytoskeletal protein spectrin using homonuclear nuclear magnetic resonance. The core of the molecule is an antiparallel beta-sheet consisting of seven strands. The C terminus is folded into a long alpha-helix, and another helix is present in one of the surface loops. The molecule is electrostatically polarized and contains a pocket which may be involved in the binding of a ligand. There is a distant relationship to the peptidyl-prolyl-cis-trans-isomerase FKBP in which this pocket is involved in the binding of the macrocyclic compound FK506 (refs 8-11).[1]

References

  1. Structure of the pleckstrin homology domain from beta-spectrin. Macias, M.J., Musacchio, A., Ponstingl, H., Nilges, M., Saraste, M., Oschkinat, H. Nature (1994) [Pubmed]
 
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