With the amino acid sequences of all reported Akt kinase physiological substrates, the possible Akt kinase substrate specificity has been suggested. The serine/ threonine residue to be phosphorylated in these proteins is placed within stretches of amino acids with homology, and the arginine residues on the ؊5 and ؊3 positions and a hydrophobic amino acid on the ؉2 position are conserved relative to those of serine/threonine residues (XXRXRXXS/TXX . We observed the phosphorylation of hTERT peptide by the human melanoma cell lysate or the activated recombinant Akt kinase proteins in vitro. With the treatment of the growth factor deprivation or okadaic acid, we also observed the up-regulation of both hTERT peptide phosphorylation and the telomerase activity. We noticed that Wortmannin down-regulates hTERT peptide phosphorylation and telomerase activity together. In addition, we observed the enhancement of telomerase activity with the pretreatment of Akt kinase in vitro. Thus, these observations suggest that Akt kinase enhances human telomerase activity through phosphorylation of hTERT subunit as one of its substrate proteins.
Ni-nitrilotriacetic acid (NTA) functionalized CdSe/ZnS quantum dots (QDs) were exploited as a site-specific labeling agent of histidine-tagged biomolecules in live cells; the QDs were found to be water-soluble, aggregation free and stable for several months.
This study evaluated the potential
use of senescence-inducing small
molecules in the treatment of melanoma. We screened commercially available
small-molecule libraries with high-throughput screening and high-content
screening image-based technology. Our findings showed an initial hit
with the embedded N-arylpiperidine-3-carboxamide
scaffold-induced senescence-like phenotypic changes in human melanoma
A375 cells without serious cytotoxicity against normal cells. A focused
library containing diversely modified analogues were constructed and
examined to evaluate the structure–activity relationship of N-arylpiperidine-3-carboxamide derivatives starting from
hit 1. This work identified a novel compound with remarkable
antiproliferative activity in vitro and demonstrated
the key structural moieties within.
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