1cnu

PHOSPHORYLATED ACTOPHORIN FROM ACANTAMOEBA POLYPHAGA

spinqualitylabelsall models 1cnu, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1cnu is a 1 chain structure with sequence from Acanthamoeba polyphaga. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.25Å Ligands: SEP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ACTP_ACACA Forms a one to one complex with monomeric actin. Can regulate the pool available for polymerization. Severs actin filaments in a dose-dependent manner. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Acanthamoeba actophorin is a member of ADF/cofilin family that binds both actin monomers and filaments. We used fluorescence anisotropy to study the interaction of actin monomers with recombinant actophorin labeled with rhodamine on a cysteine substituted for Serine-88. Labeled actophorin retains its affinity for actin and ability to reduce the low shear viscosity of actin filaments. At physiological ionic strength, actophorin binds Mg-ADP-actin monomers (Kd = 0.1 microM) 40 times stronger than Mg-ATP-actin monomers. When bound to actin monomers, actophorin has no effect on elongation at either end of actin filaments by Mg-ATP-actin and slightly increases the rate of elongation at both ends by Mg-ADP-actin. Thus actophorin does not sequester actin monomers. Sedimentation equilibrium ultracentrifugation shows that actophorin and profilin compete for binding actin monomers. Actophorin and profilin have opposite effects on the rate of exchange of nucleotide bound to actin monomers. Despite the high affinity of actophorin for ADP-actin, physiological concentrations of profilin overcome the inhibition of ADP exchange by actophorin. Profilin rapidly recycles ADP-actin back to the profilin-ATP-actin pool ready for elongation of actin filaments. Interaction of actin monomers with Acanthamoeba actophorin (ADF/cofilin) and profilin.,Blanchoin L, Pollard TD J Biol Chem. 1998 Sep 25;273(39):25106-11. PMID:9737968 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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