Symbol DSTN Entrez 11034 OMIM 609114 | Alt. symbols ADF HUGO 15750 RefSeq NM_006870 | |
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Destrin or DSTN (also known as actin depolymerizing factor or ADF) is a protein which in humans is encoded by the DSTN gene. Destrin is a component protein in microfilaments.
Contents
The product of this gene belongs to the actin-binding proteins ADF (Actin-Depolymerizing Factor)/cofilin family. This family of proteins is responsible for enhancing the turnover rate of actin in vivo. This gene encodes the actin depolymerizing protein that severs actin filaments (F-actin) and binds to actin monomers (G-actin). Two transcript variants encoding distinct isoforms have been identified for this gene.
Structure
The tertiary structure of destrin was determined by the use of triple-resonance multidimensional nuclear magnetic resonance, NMR. The secondary and tertiary structures of destrin are similar to the gelsolin family which is another actin-regulating protein family.
There are three ordered layers to destrin which is a globular protein. There is a central β sheet that is composed of one parallel strand and three antiparallel strands. This β sheet is between a long α helix along with a shorter one and two shorter helices on the opposite side. The four helices are parallel to the β strands.
Function
In a variety of eukaryotes, destrin regulates actin in the cytoskeleton. Destrin binds actin and is thought to connect it as gelsolin segment-1 does. Furthermore, the binding of actin by destrin and cofilin is regulated negatively by phosphorylation. Destrin can also sever actin filaments.