Structure
Structural biology has played a central role in the understanding of serpin function and biology. Over eighty serpin structures, in a variety of different conformations (described below), have been determined to date. Although the function of serpins varies widely, these molecules all share a common structure (or fold).
The structure of the non-inhibitory serpin ovalbumin, and the inhibitory serpin antitrypsin, revealed the archetype native serpin fold. All typically have three β-sheets (termed A, B and C) and eight or nine α-helices (hA-hI) (see figure 4). Serpins also possess an exposed region termed the reactive centre loop (RCL) that, in inhibitory molecules, includes the specificity determining region and forms the initial interaction with the target protease. In antitrypsin, the RCL is held at the top of the molecule and is not pre-inserted into the A β-sheet (figure 4, left panel). This conformation commonly exists in dynamic equilibrium with a partially inserted native conformation seen in other inhibitory serpins (see figure 4, right panel).
Read more about this topic: Serine Protease Inhibitors
Famous quotes containing the word structure:
“A structure becomes architectural, and not sculptural, when its elements no longer have their justification in nature.”
—Guillaume Apollinaire (1880–1918)
“Slumism is the pent-up anger of people living on the outside of affluence. Slumism is decay of structure and deterioration of the human spirit. Slumism is a virus which spreads through the body politic. As other “isms,” it breeds disorder and demagoguery and hate.”
—Hubert H. Humphrey (1911–1978)
“Vashtar: So it’s finished. A structure to house one man and the greatest treasure of all time.
Senta: And a structure that will last for all time.
Vashtar: Only history will tell that.
Senta: Sire, will he not be remembered?
Vashtar: Yes, he’ll be remembered. The pyramid’ll keep his memory alive. In that he built better than he knew.”
—William Faulkner (1897–1962)