41. It lacks an intracellular serine / threonine protein kinase domain and hence is a pseudoreceptor. 42. Leupeptin is an organic compound produced by actinomycetes, which inhibits cysteine and threonine proteases. 43. The higher the concentration of threonine or lysine, the more aspartate kinase becomes downregulated. 44. Rsks are serine / threonine kinases and are activated by the MAPK / ERK pathway. 45. It is negatively regulated by threonine , and the pathway is subject to additional regulation. 46. This enzyme participates in glycine, serine and threonine metabolism and glyoxylate and dicarboxylate metabolism. 47. These repeats contain serine and threonine residues that are phosphorylated in actively transcribing RNA polymerase. 48. This enzyme participates in the metabolism of glycine, serine, threonine and also methionine. 49. This enzyme participates in glycine, serine and threonine metabolism and arginine and proline metabolism. 50. This enzyme participates in glycine, serine and threonine metabolism and aminoacyl-trna biosynthesis.
