The repeating segments of the F-actin cross-linking gelation factor (ABP-120) have an immunoglobulin-like fold.Fucini, P., Renner, C., Herberhold, C., Noegel, A.A., Holak, T.A.
(1997) Nat.Struct.Mol.Biol. 4: 223-230
- PubMed: 9164464
- PubMed Abstract:
- The Dictyostelium Gelation Factor Shares a Putative Actin Binding Site with Alpha-Actinins and Dystrophin and Also Has a Rod Domain Containing Six 100-Residue Motifs that Appear to Have a Cross-Beta Conformation
Noegel, A.A.,Rapp, S.,Lottspeich, F.,Schleicher, M.,Stewart, M.
(1989) J.Cell Biol. 109: 607
- Properties of the 120,000-and 95,000-Dalton Actin-Binding Proteins from Dictyostelium Discoideum and Their Possible Functions in Assembling the Cytoplasmic Matrix
Condeelis, J.,Vahey, M.,Carboni, J.M.,Demey, J.,Ogihara, S.
(1984) J.Cell Biol. 99: 119S
- Ligand-Induced Changes in the Location of Actin, Myosin, 95K (Alpha-Actinin), and 120K Protein in Amebae of Dictyostelium Discoideum
Carboni, J.M.,Condeelis, J.S.
(1985) J.Cell Biol. 100: 1884
- Human Endothelial Actin-Binding Protein (Abp-280, Nonmuscle Filamin): A Molecular Leaf Spring
Gorlin, J.B.,Yamin, R.,Egan, S.,Stewart, M.,Stossel, T.P.,Kwiatkowski, D.J.,Hartwig, J.H.
(1990) J.Cell Biol. 111: 1089
The 120,000 M(r) gelation factor and alpha-actinin are among the most abundant F-actin cross-linking proteins in Dictyostelium discoideum. Both molecules are rod-shaped homodimers. Each monomer chain is comprised of an actin-binding domain and a rod ...
The 120,000 M(r) gelation factor and alpha-actinin are among the most abundant F-actin cross-linking proteins in Dictyostelium discoideum. Both molecules are rod-shaped homodimers. Each monomer chain is comprised of an actin-binding domain and a rod domain. The rod domain of the gelation factor consists of six 100-residue repetitive segments with high internal homology. We have now determined the three-dimensional structure of segment 4 of the rod domain of the gelation factor from D. discoideum using NMR spectroscopy. The segment consists of seven beta-sheets arranged in an immunoglobulin-like (Ig) fold. This is completely different from the alpha-actinin rod domain which consists of four spectrin-like alpha-helical segments. The gelation factor is the first example of an Ig-fold found in an actin-binding protein. Two highly homologous actin-binding proteins from human with similar sequences to the gelation factor, filamin and a 280,000 M(r) actin-binding protein (ABP-280), share conserved residues that form the core of the gelation factor repetitive segment structure. Thus, the segment 4 structure should be common to this subfamily of the spectrin superfamily. The structure of segment 4 together with previously published electron microscopy data, provide an explanation for the dimerization of the whole gelation factor molecule.
Max Planck Institute for Biochemistry, Martinsried, F.R.G.