To understand the origin of substrate inhibition in this random-order bi-substrate reaction, one needs to focus on Fig. 2a, which indicates the ranges of conformational coordinates where transitions between the different states take place.
To better understand the origins of substrate recognition and active site dynamics, we have targeted five active site residues of AfUGM and Trypanosoma cruzi UGM (TcUGM) that are unique to eUGMs: Phe66, Tyr104, Gln107, Asn207, and Tyr317 (AfUGM numbering).
One possible origin of natural substrates of DCL2 is foreign genes that are introduced into the plant genome during infection with pathogens like Agrobacterium tumefaciens.
We previously developed a model of E. coli metabolism to investigate the origin of the substrate hierarchy consumption in mixed substrate cultures [ 7].
Regardless of the evolutionary origin of the regulatory substrate, our results still explain a non-adaptive increase in regulatory complexity through mutation and genetic drift.
These have been designated the "African", "American" and "Asian" Clades based on the origin of the hosts or substrates from which the members of the GFC were isolated [ 25, 26].
First considered as a vicariant Gondwanan refugium (Morat 1993), geologists have recently demonstrated the entire submersion by subduction before a final re-emersion of the main island 'Grande Terre' ∼37 My ago coated with a fragment of oceanic crust at the origin of the ultramafic (UM) substrates (Cluzel and Chiron 1998; Neall and Trewick 2008).
From these results, we discuss the origin of the distribution pattern of substrate enzymes in the metabolic network and the roles of chaperonins in the evolution of metabolic networks.
Although there are hexosaminidases which are able to degrade a very broad range of substrates regardless of origin and type (e.g. jack bean hexosaminidase, Li and Li 1970), the enzymes showing high specificity for a defined, single terminal β-GlcNAc residue were not known until the detection of the FDL hexosaminidases in insect cell extracts (Altmann, Schwihla, et al. 1995).
The more open active site architecture of RgDAAO is the origin of its much broader substrate specificity.
