4836-52-6Relevant academic research and scientific papers
Library Selection with a Randomized Repertoire of (βα)8-Barrel Enzymes Results in Unexpected Induction of Gene Expression
Rohweder, Bettina,Lehmann, Gerhard,Eichner, Norbert,Polen, Tino,Rajendran, Chitra,Ruperti, Fabian,Linde, Mona,Treiber, Thomas,Jung, Oona,Dettmer, Katja,Meister, Gunter,Bott, Michael,Gronwald, Wolfram,Sterner, Reinhard
, p. 4207 - 4217 (2019/10/17)
The potential of the frequently encountered (βα)8-barrel fold to acquire new functions was tested by an approach combining random mutagenesis and selection in vivo. For this purpose, the genes encoding 52 different phosphate-binding (βα)8-barrel proteins were subjected to error-prone PCR and cloned into an expression plasmid. The resulting mixed repertoire was used to transform different auxotrophic Escherichia coli strains, each lacking an enzyme with a phosphate-containing substrate. After plating of the different transformants on minimal medium, growth was observed only for two strains, lacking either the gene for the serine phosphatase SerB or the phosphoserine aminotransferase SerC. The same mutants of the E. coli genes nanE (encoding a putative N-acetylmannosamine-6-phosphate 2-epimerase) and pdxJ (encoding the pyridoxine 5′-phosphate synthase) were responsible for rescuing both ΔserB and ΔserC. Unexpectedly, the complementing NanE and PdxJ variants did not catalyze the SerB or SerC reactions in vitro. Instead, RT-qPCR, RNAseq, and transcriptome analysis showed that they rescue the deletions by enlisting the help of endogenous E. coli enzymes HisB and HisC through exclusive up-regulation of histidine operon transcription. While the promiscuous SerB activity of HisB is well-established, our data indicate that HisC is promiscuous for the SerC reaction, as well. The successful rescue of ΔserB and ΔserC through point mutations and recruitment of additional amino acids in NanE and PdxJ provides another example for the adaptability of the (βα)8-barrel fold.
Hit to lead studies on (hetero)arylpyrimidines-Agonists of the canonical Wnt-β-catenin cellular messaging system
Gilbert, Adam M.,Bursavich, Matthew G.,Alon, Nippa,Bhat, Bheem M.,Bex, Frederick J.,Cain, Michael,Coleburn, Valerie,Gironda, Virginia,Green, Paula,Hauze, Diane B.,Kharode, Yogendra,Krishnamurthy, Girija,Kirisits, Matthew,Lam, Ho-Sun,Liu, Yao-Bin,Lombardi, Sabrina,Matteo, Jeanne,Murrills, Richard,Robinson, John A.,Selim, Sally,Sharp, Michael,Unwalla, Raymond,Varadarajan, Usha,Zhao, Weiguang,Yaworsky, Paul J.
experimental part, p. 366 - 370 (2010/04/06)
A series of (hetero)arylpyrimidines agonists of the Wnt-β-catenin cellular messaging system have been prepared. These compounds show activity in U2OS cells transfected with Wnt-3a, TCF-luciferase, Dkk-1 and tk-Renilla. Selected compounds show minimal GSK-3β inhibition indicating that the Wnt-β-catenin agonism activity most likely comes from interaction at Wnt-3a/Dkk-1. Two examples 1 and 25 show in vivo osteogenic activity in a mouse calvaria model. One example 1 is shown to activate non-phosphorylated β-catenin formation in bone.
