• 제목/요약/키워드: Anion binding

검색결과 95건 처리시간 0.024초

디티오카르바메이트 유도체의 새로운 1,10-페난트롤린 팔라디움(II) 착물의 DNA 결합 성질 및 세포독성에 관한 연구 (DNA Binding Studies and Cytotoxicity of the Novel 1,10-phenanthroline Palladium(II) Complexes of Dithiocarbamate Derivatives)

  • Mansouri-Torshizi, Hassan;Saeidifar, Maryam;Ghasemi, Zahra Yekke;Khastan, Mahmood;Divsalar, Adeleh;Saboury, Ali Akbar
    • 대한화학회지
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    • 제55권1호
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    • pp.70-80
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    • 2011
  • 두 종류의 새로운 팔라디움(II) 착물인 [Pd(phen)(pip-dtc)]$NO_3$와 [Pd(phen)(mor-dtc)]$NO_3$ (여기서 phen은 1,10-페난트롤린, pip-dtc은 피페리딘디티오카르바메이트 음이온, mor-dtc은 모르폴린디티오카르바메이트 음이온을 가리킨다)를 합성하고 원소분석, 분광법(FT-IR, $^1H$ NMR, UV-Vis) 및 전기전도도 측정을 이용하여 특성을 조사하였다. 이 착물들에서, 디티오카르베이트 리간드는 팔라디움 (II) 중심과 두 개의 황 원자와 이중으로 배위 결합을 하고 있다. 이 착물의 세포독성을 K562 세포주를 이용하여 조사하였을 때 $IC_{50}$ 값이 시스플라틴보다 작았기 때문에 착물들의 송아지 흉선 DNA(CT-DNA)와의 결합 모드를 UV 흡광도 차이와 형광 분광법으로 조사하였다. 착물들은 DNA를 변형시키고, 협동결합을 하고, DNA에 끼어 들어간다. 또한 몇 가지 결합 및 열역학적인 변수들이 기술되었다.

Consensus channelome of dinoflagellates revealed by transcriptomic analysis sheds light on their physiology

  • Pozdnyakov, Ilya;Matantseva, Olga;Skarlato, Sergei
    • ALGAE
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    • 제36권4호
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    • pp.315-326
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    • 2021
  • Ion channels are membrane protein complexes mediating passive ion flux across the cell membranes. Every organism has a certain set of ion channels that define its physiology. Dinoflagellates are ecologically important microorganisms characterized by effective physiological adaptability, which backs up their massive proliferations that often result in harmful blooms (red tides). In this study, we used a bioinformatics approach to identify homologs of known ion channels that belong to 36 ion channel families. We demonstrated that the versatility of the dinoflagellate physiology is underpinned by a high diversity of ion channels including homologs of animal and plant proteins, as well as channels unique to protists. The analysis of 27 transcriptomes allowed reconstructing a consensus ion channel repertoire (channelome) of dinoflagellates including the members of 31 ion channel families: inwardly-rectifying potassium channels, two-pore domain potassium channels, voltage-gated potassium channels (Kv), tandem Kv, cyclic nucleotide-binding domain-containing channels (CNBD), tandem CNBD, eukaryotic ionotropic glutamate receptors, large-conductance calcium-activated potassium channels, intermediate/small-conductance calcium-activated potassium channels, eukaryotic single-domain voltage-gated cation channels, transient receptor potential channels, two-pore domain calcium channels, four-domain voltage-gated cation channels, cation and anion Cys-loop receptors, small-conductivity mechanosensitive channels, large-conductivity mechanosensitive channels, voltage-gated proton channels, inositole-1,4,5-trisphosphate receptors, slow anion channels, aluminum-activated malate transporters and quick anion channels, mitochondrial calcium uniporters, voltage-dependent anion channels, vesicular chloride channels, ionotropic purinergic receptors, animal volage-insensitive cation channels, channelrhodopsins, bestrophins, voltage-gated chloride channels H+/Cl- exchangers, plant calcium-permeable mechanosensitive channels, and trimeric intracellular cation channels. Overall, dinoflagellates represent cells able to respond to physical and chemical stimuli utilizing a wide range of G-protein coupled receptors- and Ca2+-dependent signaling pathways. The applied approach not only shed light on the ion channel set in dinoflagellates, but also provided the information on possible molecular mechanisms underlying vital cellular processes dependent on the ion transport.

PROTEIN-CROSS-LINKING BY METHYLGLYOXAL

  • Lee, Cheolju;Kang, Sa-Ouk
    • 한국생물물리학회:학술대회논문집
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    • 한국생물물리학회 1996년도 정기총회 및 학술발표회
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    • pp.46-46
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    • 1996
  • To elucidate the mechanism for the cross-linking reaction in the glycation or Maillard reaction, we studied the reaction between proteins, and a three-carbon ${\alpha}$-ketoaldehyde, methylglyoxal. When Cu, Zn-SOD was incubated with 200 mM of methylglyoxal, the peroxidase activity as well as the superoxide dismutase activity was reduced. This reduction is accompanied by the decrease of the anion binding affinity of the enzyme. (omitted)

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Effects of DIDS on single $Ca^{2+}$ release channel behavior of skeletal muscle

  • Seo, In-Ra;Kim, Do-Han
    • 한국생물물리학회:학술대회논문집
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    • 한국생물물리학회 2001년도 학술 발표회 진행표 및 논문초록
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    • pp.46-46
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    • 2001
  • Evidence has suggested that an anion channel blocker, 4, 4'-diisothiocyanatostilbene-2, 2' disulfonic acid (DIDS) could trigger Ca release from skeletal sarcoplasmic reticulum (SR) by binding to a 30 kDa SR protein. Since the high molecular weight $Ca^{2+}$ release channel (CRC)/ryanodine receptor (RyR) is the main SR protein that conducts $Ca^{2+}$ efflux in skeletal muscles, the relationship between CRC and the 30kDa protein remains to be elucidated.(omitted)

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Electron Paramagnetic Resonance Study of Bis(N-methyl-2-amino-1-cyclopentenedithiocarboxylato)Copper (II)

  • Woo-Seong Kim;Young-Inn Kim;Sung-Nak Choi
    • Bulletin of the Korean Chemical Society
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    • 제11권2호
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    • pp.85-88
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    • 1990
  • The electron paramagnetic resonance (EPR) spectrum of the copper (II) complex with the 2-methylamino-1-cyclo-pentene-1-dithiocarboxylate (acdc) anion, $Cu(N-CH_3acdc)_2$ has been studied in the diamagnetic host lattices afforded by the corresponding divalent nickel, zinc, cadmium and mercury complexes. EPR parameters of the complex support the exclusive use of sulfur atoms by the ligand in metal binding. A combination of host lattice structure and covalency effects can be account for the observed spin-Hamiltonian parameters.

Band Electronic Structure Study of Two-Dimensional Organic Metal (BEDT-TTF)2Cu5I6 with a Polymer Anion Layer

  • Dae Bok Kang
    • Bulletin of the Korean Chemical Society
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    • 제12권5호
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    • pp.515-517
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    • 1991
  • The electronic behavior of a organic metal $(BEDT-TTE)_2$${Cu_5}{I_6}$ observed to be stable at low temperatures was examined by performing tight-binding band electronic structure calculations. The suppression of a metal-insulator tansition is likely to originate from its quasi-two-dimensional Fermi surface with no nesting, in agreement with experiment.

Calix[4]pyrroles Bearing Pyrene-pickets at Diametrical Meso-positions with Amide Linkage

  • Yoo, Jae-Duk;Park, In-Won;Kim, Tae-Young;Lee, Chang-Hee
    • Bulletin of the Korean Chemical Society
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    • 제31권3호
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    • pp.630-634
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    • 2010
  • The synthesis and ion binding properties of calix[4]pyrrole bearing pyrene moieties appended to one side of the calix[4]pyrrole are reported. The key feature is the presence of flexible fluorescence arms attached to the calix[4]pyrrole ring in a cis-fashion. The preliminary solution phase anion and cation binding studies revealed that the systems can be in fact as viable sensors for anionic guest.

Expession of the Recombinant Klebsiella aerognes UreF Protein as a MalE Fusion

  • Kim, Keun-Young;Yang, Chae-Ha;Lee, Mann-Hyung
    • Archives of Pharmacal Research
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    • 제22권3호
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    • pp.274-278
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    • 1999
  • Expression of the active urease of the enterobacterium, Klebsiella aerogens, requires the presence of the accessory genes (ureD, ureE, ureF, and ureG) in addition to the three structural genes (ureA, ureB, and ureC). These accessory genes are involved in functional assembly of the nickel-metallocenter for the enzyme. Characterization of ureF gene has been hindered, however, since the UreF protein is produced in only minute amount compared to other urease gene products. In order to overexpress the ureF gene, a recombinant pMAL-UreF plasmid was constructed from which the UreF was produced as a fusion with maltose-binding protein. The MBP-UreF fusion protein was purified by using an amylose-affinity column chromatography followed by an anion exchange column chromatography. Polyclonal antibodies raised against the fusion protein were purified and shown to specifically recognize both MBP and UreF peptides. The UreF protein was shown to be unstable when separated from MBP by digestion with factor Xa.

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돼지 육골분 및 진주담치 단백질의 가수분해물 제조 및 칼슘 결합 물질의 분리 (Isolation of calcium-binding peptides from porcine meat and bone meal and mussel protein hydrolysates)

  • 정승훈;송경빈
    • 한국식품저장유통학회지
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    • 제22권2호
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    • pp.297-302
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    • 2015
  • 저활용 단백질로부터 칼슘 결합물질을 분리하기 위해 돼지 육골분과 진주담치 단백질을 단백질 분해 효소인 alcalase를 이용하여 가수분해물을 제조하였고, 체내 흡수가 용이한 3 kDa 이하로 한외여과 하였다. 돼지 육골분 가수분해물은 Mono Q 컬럼을 통해 분리하였고, 진주담치 가수분해물의 경우 Q-Sepharose로 분리 하여 각각 2개, 3개의 peptide fraction을 얻어 각 fraction의 칼슘 결합력을 측정하였다. 그 결과 MBM F2와 Mussel F3에서 가장 높은 칼슘 결합력을 나타내었고, 따라서 본 연구 결과로 얻어진 가수분해물들은 칼슘 보충 소재로 활용될 수 있다고 판단된다.