3u4l: Difference between revisions
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== Function == | == Function == | ||
[https://www.uniprot.org/uniprot/ACTB_BOVIN ACTB_BOVIN] Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells. | [https://www.uniprot.org/uniprot/ACTB_BOVIN ACTB_BOVIN] Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells. | ||
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== Publication Abstract from PubMed == | |||
Actin is a ubiquitous eukaryotic protein that is responsible for cellular scaffolding, motility, and division. The ability of actin to form a helical filament is the driving force behind these cellular activities. Formation of a filament depends on the successful exchange of actin's ADP for ATP. Mammalian profilin is a small actin binding protein that catalyzes the exchange of nucleotide and facilitates the addition of an actin monomer to a growing filament. Here, crystal structures of profilin-actin have been determined to show an actively exchanging ATP. Structural analysis shows how the binding of profilin to the barbed end of actin causes a rotation of the small domain relative to the large domain. This conformational change is propagated to the ATP site and causes a shift in nucleotide loops, which in turn causes a repositioning of Ca(2+) to its canonical position as the cleft closes around ATP. Reversal of the solvent exposure of Trp356 is also involved in cleft closure. In addition, secondary calcium binding sites were identified. | |||
Structural basis for profilin-mediated actin nucleotide exchange.,Porta JC, Borgstahl GE J Mol Biol. 2012 Apr 20;418(1-2):103-16. Epub 2012 Feb 22. PMID:22366544<ref>PMID:22366544</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
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==See Also== | ==See Also== | ||
*[[Actin 3D structures|Actin 3D structures]] | *[[Actin 3D structures|Actin 3D structures]] | ||
*[[Profilin 3D Structures|Profilin 3D Structures]] | *[[Profilin 3D Structures|Profilin 3D Structures]] | ||
== References == | |||
<references/> | |||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
