Of the clones analyzed in this first stage, ~10% showed xylanase activity, which is an improvement when compared to the results of random insertion of beta-lactamase into MBP (maltose binding protein), in which only 0.8% of the clones showed catalytic activity [ 8].
The best studied example of a balanced polymorphism is in serum mannose-binding protein, in which several variants that have reduced capacity to activate complement have been identified [ 57].
The TTR control has the typical behaviour of a specific T4-binding protein, in which the increase of cold T4 concentration causes the displacement of specifically bound radiolabeled T4 *.
Taken together, these results indicate that the macrophage galactose receptor shares many of the features of serum mannose-binding protein, in which clusters of monosaccharide-binding sites serve as detectors for a simple epitope that is not common on endogenous cell surface glycans but that is abundant on the surfaces of tumor cells and certain pathogens.
The sensitivity of the CD signal in this region of the spectrum is thus consistent with a model for the structure of the CRD from MGL based on the CRD of mannose-binding protein, in which the CD signal of the conserved tryptophan is sensitive to the position and conformation of the proline residue.
The finding that the neck domain is primarily responsible for trimer formation contrasts with mannose-binding protein, in which extensive interactions between the CRDs are needed to stabilize the trimer and the neck domain is too short to form a stable coiled coil on its own.
For over two decades, researchers have struggled to define the raison d'être for actin-binding proteins in plasma, which under normal circumstances does not contain detectable actin.
It was a class of small molecules ubiquitous GTP-binding proteins in eukaryotes, which functioned as binary molecular switches for the controlling of intracellular signaling networks, and mainly involved in cell proliferation, signal transduction, endocytosis, vesicular transport, cell growth and differentiation [ 47].
There are estimated 3,000 zinc binding proteins in the human genome of which over 300 are enzymes of all classes [ 3].
Centromeres are usually composed of repetitive DNAs that bind site-specific DNA binding proteins, which in turn promote assembly of nucleosomes whose histone H3 is replaced by a variant called CENP-A.
