Aspartate

kinase in an allosteric enzyme has a wide applications in biotechnological industry and mainly responsible for the biosynthesis of amino acids. The efficiency of biosynthesis is largely depends AZD6244 mw upon quality of strains used in microbial fermentation. The understanding of the metabolic pathways of lysine biosynthesis and regulation through metabolic engineering helps to the effective strain development. The enzymatic action and mechanism of inhibition of aspartate kinase is well understood through large number of crystallographic and biochemical analysis. However, continued efforts have been made to understand the mechanism and regulation of aspartate kinase from suitable organism to define the successful construction of industrially producing strains. In the aspartate kinase, the binding of lysine to the regulatory domain triggers the structural rearrangements for formation of tetrameriztion of the biological homodimers (Fig. 5). Concurrently, the allosteric transition of the catalytic domain leads to blocking of the nucleotide binding site and eventually loss of enzymatic activity. this website In CaAK, the mechanism of inhibition follows the similar

fashion when compare to the other class I AK enzymes. Mainly, most of the structural elements which are implicated in probing the catalytic, substrate-binding and allosteric mechanisms are conserved. Secondly, the way of binding of lysine molecules at the interface of the two ACT1 domains from different monomers provides to identify the residues which are implicated

in lysine interactions. This structural observation can be tested by studying inhibition profile of lysine in CaAK. Further, site-directed mutational analysis of these residues makes it possible to engineer the lysine binding site. This eventually helps to manipulating Carnitine palmitoyltransferase II the biosynthesis of amino acid to increase the amino acid content and nutritive value in crops. Recently, much work has been done to metabolically engineered crops and grains with enhanced amino acid levels [42] and [43]. Thirdly, the mechanism of structural transition to tetramer assembly is similar way to the other three different crystallographic environments. However, the tetramer configuration of CaAK is totally different than the other known AK structures. The improved understanding plant amino acid biosynthesis pathways potentially helps to design strategies employed for metabolic engineering. Finally, most of the residues which are implicated in probing the catalytic, substrate-binding and allosteric mechanisms are also conserved in pathogenic CtAK and CpAK. Therefore, the structure we reported here will provide useful information for drug design targeting on pathogenic AKs. AK is a key enzyme controlling the biosynthesis of lysine. The allosteric regulation of AK represents a typical mechanism of metabolic control of strong rigid node, i.e.