Search results for: Kiyoung Park

Items from 1 to 13 out of 13 results

article

Anion‐Induced Catalytic Reaction in a Solution‐Processed Molybdenum Oxide for Efficient Inverted Ternary Organic Photovoltaics

Taeyoon Ki, Changhoon Lee, Jehan Kim, In‐Wook Hwang, more

Advanced Functional Materials > 32 > 35 > n/a - n/a

Solution‐processed transition metal oxides (TMOs) prepared from complex ion precursors are developed as promising scalable interfacial layers for non‐fullerene organic photovoltaics (OPVs); however, challenges remain in achieving defect‐free and highly oriented metal‐oxygen networks without post‐deposition treatments due to the presence of residual organic metal‐binding ligands in films. Herein, the...

article

Roles of eIF4E-binding protein Caf20 in Ste12 translation and P-body formation in yeast

Kiyoung Park, Yu-Seon Lee, Daehee Jung, Jinmi Kim

Journal of Microbiology > 2018 > 56 > 10 > 744-747

Translation initiation factor eIF4E forms eIF4E-eIF4G complex at the 5’ cap of mRNA. This interaction can be inhibited by the family of 4E-binding proteins (4E-BP). In yeast Saccharomyces cerevisiae, two 4E-BPs, Caf20 and Eap1, compete with eIF4G for binding to eIF4E via the shared conserved interaction motif. In order to investigate the roles of Caf20 in gene-specific translational regulation and...

article

Structure/function correlations over binuclear non-heme iron active sites

Edward I. Solomon, Kiyoung Park

JBIC Journal of Biological Inorganic Chemistry > 2016 > 21 > 5-6 > 575-588

Binuclear non-heme iron enzymes activate O₂ to perform diverse chemistries. Three different structural mechanisms of O₂ binding to a coupled binuclear iron site have been identified utilizing variable-temperature, variable-field magnetic circular dichroism spectroscopy (VTVH MCD). For the μ-OH-bridged Fe(II)₂ site in hemerythrin, O₂ binds terminally to a five-coordinate Fe(II) center as hydroperoxide...

article

Resonance Raman spectroscopic study of the interaction between Co(II)rrinoids and the ATP:corrinoid adenosyltransferase PduO from Lactobacillus reuteri

Kiyoung Park, Paola E. Mera, Jorge C. Escalante-Semerena, Thomas C. Brunold

JBIC Journal of Biological Inorganic Chemistry > 2016 > 21 > 5-6 > 669-681

The human-type ATP:corrinoid adenosyltransferase PduO from Lactobacillus reuteri (LrPduO) catalyzes the adenosylation of Co(II)rrinoids to generate adenosylcobalamin (AdoCbl) or adenosylcobinamide (AdoCbi⁺). This process requires the formation of “supernucleophilic” Co(I)rrinoid intermediates in the enzyme active site which are properly positioned to abstract the adeonsyl moiety from co-substrate...

article

Unprecedented Mechanism Employed by the Salmonella enterica EutT ATP:Co^Irrinoid Adenosyltransferase Precludes Adenosylation of Incomplete Co^IIrrinoids

Kiyoung Park, Paola E. Mera, Theodore C. Moore, Jorge C. Escalante‐Semerena, more

Angewandte Chemie > 127 > 24 > 7264 - 7267

Three distinct families of ATP:corrinoid adenosyltransferases (ACATs) exist that are capable of converting vitamin B₁₂ derivatives into coenzyme B₁₂ by catalyzing the thermodynamically challenging reduction of Co^IIrrinoids to form “supernucleophilic” Co^I intermediates. While the structures and mechanisms of two of the ACAT families have been studied extensively, little is known about the EutT enzymes...

article

Unprecedented Mechanism Employed by the Salmonella enterica EutT ATP:Co^Irrinoid Adenosyltransferase Precludes Adenosylation of Incomplete Co^IIrrinoids

Kiyoung Park, Paola E. Mera, Theodore C. Moore, Jorge C. Escalante‐Semerena, more

Angewandte Chemie International Edition > 54 > 24 > 7158 - 7161

article

Nuclear Resonance Vibrational Spectroscopy and DFT study of Peroxo‐Bridged Biferric Complexes: Structural Insight into Peroxo Intermediates of Binuclear Non‐heme Iron Enzymes

Kiyoung Park, Tomohiro Tsugawa, Hideki Furutachi, Yeonju Kwak, more

Angewandte Chemie > 125 > 4 > 1332 - 1336

Niederfrequente Schwingungsmodi von Peroxo‐verbrückten zweikernigen High‐Spin‐Eisenkomplexen wurden mit Kernresonanz‐Schwingungsspektroskopie (NRVS; siehe Bild, PVDOS=partielle Schwingungszustandsdichte) gemessen und mithilfe von DFT‐Rechnungen zugewiesen. Korrelationen zwischen den spektralen Merkmalen und der Struktur Peroxo‐verbrückter Kerne bilden eine Basis für die Strukturaufklärung von Enzym‐Peroxo‐Intermediaten.

article

Nuclear Resonance Vibrational Spectroscopy and DFT study of Peroxo‐Bridged Biferric Complexes: Structural Insight into Peroxo Intermediates of Binuclear Non‐heme Iron Enzymes

Kiyoung Park, Tomohiro Tsugawa, Hideki Furutachi, Yeonju Kwak, more

Angewandte Chemie International Edition > 52 > 4 > 1294 - 1298

Low‐frequency vibrational modes of peroxo‐bridged high‐spin biferric complexes have been observed using nuclear resonance vibrational spectroscopy (NRVS; see picture, PVDOS=partial vibrational density‐of‐states) and assigned using DFT calculations. Correlations between the spectral features and the structure of peroxo‐bridged cores form a basis for structural elucidation of enzyme–peroxo intermediates.

chapter

Human-robot interface using robust speech recognition and user localization based on noise separation device

Kiyoung Park, Sung Joo Lee, Ho-Young Jung, Yunkeun Lee

RO-MAN 2009 - The 18th IEEE International Symposium on Robot and Human Interactive Communication > 328 - 333

RO-MAN 2009 - 18th IEEE International Symposium on Robot and Human Interactive Communication

This paper introduces a robust human-robot interface (HRI) system using a speech recognition and a user localization. For a robust speech recognition indoors under unknown noises and acoustic reverberations, a blind source separation (BSS) algorithm is implemented by a block-wise processing and developed using digital signal processing board to guarantee real-time operation. And a reverberation-robust...

article

Spectroscopically validated density functional theory studies of the B12 cofactors and their interactions with enzyme active sites

Thomas C. Brunold, Karen S. Conrad, Matthew D. Liptak, Kiyoung Park

Coordination Chemistry Reviews > 2009 > 253 > 5-6 > 779-794

Vitamin B ₁₂ and its biologically active derivatives, 5′-deoxyadenosylcobalamin (AdoCbl) and methylcobalamin (MeCbl), have long fascinated chemists with their elaborate structures and unusual reactivities in enzymatic systems. Due to their large size and complex electronic structures, these cofactors have posed a major challenge for computational chemists. Yet, recent insights gained from...

article

Kinetic and Spectroscopic Studies of the ATP:Corrinoid Adenosyltransferase PduO from Lactobacillus reuteri : Substrate Specificity and Insights into the Mechanism of Co(II)corrinoid Reduction ^†

Kiyoung Park, Paola E. Mera, Jorge C. Escalante-Semerena, Thomas C. Brunold

Biochemistry > 2008 > 47 > 34 > 9007 - 9015

chapter

An extended exponential index scheme for Multi-disk broadcast in a single wireless channel

Kiyoung Park, Sungwon Jung

2008 8th IEEE International Conference on Computer and Information Technology > 83 - 88

2008 8th IEEE International Conference on Computer and Information Technology

In the wireless broadcast scheme, single channel index schemes are fit to flat broadcast that performs well when all the broadcasted data items are accessed with the same probability whereas the multi-disk broadcast scheme is proper when the data access distribution is skewed. The existing index schemes, however, cannot point the replicating data items in a broadcast cycle, so they are not efficient...

article

Structural Characterization of a Human-Type Corrinoid Adenosyltransferase Confirms That Coenzyme B ₁₂ Is Synthesized through a Four-Coordinate Intermediate ^† ^‡

Martin St. Maurice, Paola Mera, Kiyoung Park, Thomas C. Brunold, more

Biochemistry > 2008 > 47 > 21 > 5755 - 5766

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