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Fluorescence Probes for Tyrosine Dephosphorylation Based on Coumarin–Proline Conjugates
Choi, Kihang,Park, Bongjeong,Han, So-Yeong,Ahn, Hee Choon The Chemical Society of Japan 2011 Chemistry letters Vol.40 No.3
<P>Proline-substituted coumarin compounds were prepared and used as environment-sensitive fluorescence probes. Phosphorylation and dephosphorylation of tyrosine derivatives labeled with the coumarin–proline conjugate induced marked changes in fluorescence intensity allowing phosphatase activity to be monitored.</P>
Artificial neural network study on organ-targeting peptides
Jung, Eunkyoung,Kim, Junhyoung,Choi, Seung-Hoon,Kim, Minkyoung,Rhee, Hokyoung,Shin, Jae-Min,Choi, Kihang,Kang, Sang-Kee,Lee, Nam Kyung,Choi, Yun-Jaie,Jung, Dong Hyun Springer-Verlag 2010 Journal of computer-aided molecular design Vol.24 No.1
Park, Young Kwan,Choi, Sang Beom,Kim, Hyunuk,Kim, Kimoon,Won, Byoung-Ho,Choi, Kihang,Choi, Jung-Sik,Ahn, Wha-Seung,Won, Nayoun,Kim, Sungjee,Jung, Dong Hyun,Choi, Seung-Hoon,Kim, Ghyung-Hwa,Cha, Sun-Sh WILEY-VCH Verlag 2007 Angewandte Chemie Vol.119 No.43
<B>Graphic Abstract</B> <P>Poren zeigen Größe: Ein mesoporöses metall-organisches Netzwerk, das vorrangig aus Tb<SUP>3+</SUP>-Ionen und tripodalen Carboxylatliganden aufgebaut ist, bringt es auf Käfige mit 3.9 und 4.7 nm Durchmesser (siehe Bild). Das leere Netzwerk ist beständig und kann Gas- oder Ferrocenmoleküle aufnehmen, was durch Gassorptions- und Lumineszenzstudien bestätigt wurde. <img src='wiley_img/00448249-2007-119-43-ANGE200702324-content.gif' alt='wiley_img/00448249-2007-119-43-ANGE200702324-content'> </P>
Park, Young Kwan,Choi, Sang Beom,Kim, Hyunuk,Kim, Kimoon,Won, Byoung-Ho,Choi, Kihang,Choi, Jung-Sik,Ahn, Wha-Seung,Won, Nayoun,Kim, Sungjee,Jung, Dong Hyun,Choi, Seung-Hoon,Kim, Ghyung-Hwa,Cha, Sun-Sh WILEY-VCH Verlag 2007 Angewandte Chemie. international edition Vol.46 No.43
<B>Graphic Abstract</B> <P>Supersized pores: A new mesoporous metal–organic framework that is mainly composed of Tb<SUP>3+</SUP> ions and tripodal carboxylate ligands has cages of 3.9 and 4.7 nm in diameter (see picture). The evacuated framework is robust and can accommodate gases or ferrocene molecules, as verified by gas-sorption measurements and luminescence studies. <img src='wiley_img/14337851-2007-46-43-ANIE200702324-content.gif' alt='wiley_img/14337851-2007-46-43-ANIE200702324-content'> </P>
Identification of tissue-specific targeting peptide.
Jung, Eunkyoung,Lee, Nam Kyung,Kang, Sang-Kee,Choi, Seung-Hoon,Kim, Daejin,Park, Kisoo,Choi, Kihang,Choi, Yun-Jaie,Jung, Dong Hyun ESCOM ; Kluwer Academic Publishers 2012 Journal of computer-aided molecular design Vol.26 No.11
<P>Using phage display technique, we identified tissue-targeting peptide sets that recognize specific tissues (bone-marrow dendritic cell, kidney, liver, lung, spleen and visceral adipose tissue). In order to rapidly evaluate tissue-specific targeting peptides, we performed machine learning studies for predicting the tissue-specific targeting activity of peptides on the basis of peptide sequence information using four machine learning models and isolated the groups of peptides capable of mediating selective targeting to specific tissues. As a representative liver-specific targeting sequence, the peptide 'DKNLQLH' was selected by the sequence similarity analysis. This peptide has a high degree of homology with protein ligands which can interact with corresponding membrane counterparts. We anticipate that our models will be applicable to the prediction of tissue-specific targeting peptides which can recognize the endothelial markers of target tissues.</P>
Catalytic nickel nanoparticles embedded in a mesoporous metal–organic framework
Park, Young Kwan,Choi, Sang Beom,Nam, Hye Jin,Jung, Duk-Young,Ahn, Hee Choon,Choi, Kihang,Furukawa, Hiroyasu,Kim, Jaheon Royal Society of Chemistry 2010 Chemical communications Vol.46 No.18
<P>Ni nanoparticles embedded in the pores of a mesoporous MOF (MesMOF-1) act as a catalyst for hydrogenolysis of nitrobenzene or hydrogenation of styrene.</P> <P>Graphic Abstract</P><P>Ni nanoparticles embedded in the pores of a mesoporous MOF (MesMOF-1) act as a catalyst for hydrogenolysis of nitrobenzene or hydrogenation of styrene. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c000775g'> </P>
Jung, Sun hwa,Choi, Kihang,Pae, Ae Nim,Lee, Jae Kyun,Choo, Hyunah,Keum, Gyochang,Cho, Yong Seo,Min, Sun-Joon The Royal Society of Chemistry 2014 Organic & Biomolecular Chemistry Vol.12 No.47
<P>This article describes the rapid and diversified synthesis of pyrrolidinyl triazoles for the discovery of mitochondrial permeability transition pore (mPTP) blockers. The 1,3-dipolar cycloaddition of ethynyl trifluoroborate with azidopyrrolidine produced a key intermediate, triazolyl trifluoroborate <B>4</B>, which subsequently underwent a Suzuki–Miyaura coupling reaction to afford a series of 1,4-disubstituted triazoles <B>2</B>. Subsequent biological evaluation of these derivatives indicated <B>2ag</B> and <B>2aj</B> as the most potent mPTP blockers exhibiting excellent cytochrome P450 (CYP) stability when compared to the previously reported oxime analogue <B>1</B>. The present work clearly demonstrates that a 1,2,3-triazole can be used as a stable oxime surrogate. Furthermore, it suggests that late-stage diversification through coupling reactions of organotrifluoroborates is suitable for the rapid discovery of biologically active molecules.</P> <P>Graphic Abstract</P><P>Pyrrolidinyl triazoles were synthesized <I>via</I> Huisgen 1,3-dipolar cycloadditions of ethynyl trifluoroborate followed by Suzuki–Miyaura coupling reactions and biologically evaluated as potential mPTP blockers. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4ob01967a'> </P>
Kaur, Matinder,Ahn, Ye-Hee,Choi, Kihang,Cho, Min Ju,Choi, Dong Hoon The Royal Society of Chemistry 2015 Organic & Biomolecular Chemistry Vol.13 No.26
<P>A bifunctional fluorescent probe based on a carbazole-pyrimidine conjugate for Hg2+ and Cu2+ detection was designed and synthesized. Probe 3 exhibits red shifts in its absorption and fluorescence spectra with significant visual color changes in the presence of these ions. The detection limits of probe 3 for these metal ions were in the nanomolar range. The probe could also be useful as a solid optical sensor for Hg2+ and Cu2+.</P>