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Kurimoto K, Yamamura H, Miyagawa A. Chemical approach for the syntheses of GM4 isomers with sialic acid to non-natural linkage positions on galactose. Carbohydr Res 2014; 401:39-50. [PMID: 25464080 DOI: 10.1016/j.carres.2014.10.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 10/21/2014] [Accepted: 10/21/2014] [Indexed: 10/24/2022]
Abstract
Cell-surface glycans containing sialic acid are involved in various biological phenomena. However, the syntheses of GM4 derivatives with (2 → 2) and (2 → 4) linkages have not been investigated to date. In this study, sialylation of all of the hydroxyl groups on galactose were investigated for the syntheses of GM4 isomers. Regioselective sialylation was achieved via protection of galactosyl acceptors using electron-rich benzyl groups. These synthetic sialylated glycans will prove to be useful tools for studying unidentified carbohydrate-mediated biological roles.
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Yamamura H, Sugiyama Y, Murata K, Yokoi T, Kurata R, Miyagawa A, Sakamoto K, Komagoe K, Inoue T, Katsu T. Synthesis of antimicrobial cyclodextrins bearing polyarylamino and polyalkylamino groups via click chemistry for bacterial membrane disruption. Chem Commun (Camb) 2014; 50:5444-6. [DOI: 10.1039/c3cc49543d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yamamura H, Shimohara K, Kurata R, Fujita Y, Murata K, Hayashi T, Miyagawa A. Unique, Fast, and All-or-none Click Reaction on Cyclodextrin and Amylose. CHEM LETT 2013. [DOI: 10.1246/cl.130095] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Uchino O, Maeda M, Yamamura H, Hirono M. Observation of stratospheric vertical ozone distribution by a XeCl lidar. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jc088ic09p05273] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yamamura H, Suzuki K, Uchibori K, Miyagawa A, Kawai M, Ohmizo C, Katsu T. Mimicking an antimicrobial peptidepolymyxin B by use of cyclodextrin. Chem Commun (Camb) 2012; 48:892-4. [DOI: 10.1039/c1cc16369h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ito S, Watanabe M, Saito M, Yamamura H. Electrical Properties of New Brounmillerite-type Ba2In2-x(Zn, Zr)xO5 System. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.proeng.2012.03.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ono H, Yoshikawa H, Ueda T, Yamamura H, Kudawara I, Manou M, Ishiguro S, Funai H, Koyanagi Y, Araki N, Hashimoto N, Sonobe H, Tatsuta M, Takahashi K. Expression of smooth muscle calponin in synovial sarcoma. Sarcoma 2011; 3:107-13. [PMID: 18521272 PMCID: PMC2395415 DOI: 10.1080/13577149977730] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Purpose. Histogenesis of synovial sarcoma remains controversial and reliable molecular markers for diagnosis are necessary. Expression of basic calponin, a smooth muscle differentiation-specific actin-binding protein, was studied in synovial sarcoma.Subjects and Methods. The basic calponin gene and the gene product were analyzed by reverse transcription PCR analysis (RT-PCR) and immunohistochemistry in 14 synovial sarcomas and a human synovial sarcoma cell line (HS-SY-II).Results and Discussion. Immunoreactivity for basic calponin was detected in the cytoplasm of 6 synovial sarcomas (43% positive). In the basic calponin-positive tumors and the HS-SY-II cells, expression for smooth muscle-specific genes, including basic calponin and SM22alpha , was detected by RT-PCR, suggesting a lineage relationship between synovial sarcoma cells and smooth muscle-like mesenchymal cells.Conclusions. A subset of synovial sarcomas expressing the basic calponin gene and the gene product were identified. The basic calponin may have potential utility as a novel molecular marker identifying certain synovial sarcomas.
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Okada M, Kitagawa M, Kanayama K, Yamamura H, Sakai T. Negative MRI findings in a case of degenerative myelopathy in a dog. J S Afr Vet Assoc 2010; 80:254-6. [PMID: 20458868 DOI: 10.4102/jsava.v80i4.222] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
An 11-year-old male Rough collie was submitted with paraparesis, but did not respond to medical treatment. Clinical signs worsened and the dog displayed paralysis, inability to stand and loss of voluntary bladder control, whereupon magnetic resonance imaging (MRI) was performed. No significant abnormalities were identified from MRI, blood tests, cerebrospinal fluid tests or radiography. After MRI, the dog developed dyspnoea and died. Autopsy and subsequent histopathological examination led to a diagnosis of degenerative myelopathy.
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Himeno Y, Miyagawa A, Kawai M, Yamamura H. γ-Cyclodextrins possessing an azido group and a triisopropylbenzenesulfonyl group as useful synthetic and authentic intermediates for unsymmetrically functionalized derivatives. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.08.061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Rekharsky M, Yamamura H, Mori T, Sato A, Shiro M, Lindeman S, Rathore R, Shiba K, Ko Y, Selvapalam N, Kim K, Inoue Y. Supramolecular Complexation ofN-Alkyl- andN,N′-Dialkylpiperazines with Cucurbit[6]uril in Aqueous Solution and in the Solid State. Chemistry 2009; 15:1957-65. [DOI: 10.1002/chem.200800398] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kawai M, Yamamura H, Tanaka R, Umemoto H, Ohmizo C, Higuchi S, Katsu T. Proline residue-modified polycationic analogs of gramicidin S with high antibacterial activity against both Gram-positive and Gram-negative bacteria and low hemolytic activity*. ACTA ACUST UNITED AC 2008; 65:98-104. [PMID: 15686540 DOI: 10.1111/j.1399-3011.2004.00204.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Novel polycationic analogs of the cyclic decapeptide antibiotic, gramicidin S, possessing NH(2), D/L-Phe-NH or L-Lys-NH groups at the 4alpha- or 4beta-positions of the L-Pro residues, were synthesized. While L-Pro(4alpha/beta-NH(2))-containing analogs exhibited much weaker antibacterial activity, the D/L-Phe and L-Lys-substituted analogs exhibited higher antibacterial activity against Gram-negative bacteria than the parent gramicidin S. All of these additional amino group-containing analogs showed substantially reduced toxicity against human blood cells.
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Rekharsky MV, Yamamura H, Ko YH, Selvapalam N, Kim K, Inoue Y. Sequence recognition and self-sorting of a dipeptide by cucurbit[6]uril and cucurbit[7]uril. Chem Commun (Camb) 2008:2236-8. [PMID: 18463751 DOI: 10.1039/b719902c] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cucurbit[7]uril forms very strong complex with zwitterionic dipeptide Phe-Gly with affinity exceeding 10(7) M(-1) and effectively recognizes peptide sequence of Phe-Gly over Gly-Phe as well as Tyr-Gly over Gly-Tyr and Trp-Gly over Gly-Trp with relative affinities of 23 000, 18 000 and 2000, respectively.
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Yamamura H, Tashiro H, Kawasaki J, Kawamura K, Masao K. Polysulfonylated cyclodextrins. Part 13: Chemistry of cyclomaltoheptaose tetrasulfonates providing a complete 6-O-sulfonylated cyclomaltoheptaoses library. Tetrahedron 2007. [DOI: 10.1016/j.tet.2006.12.033] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kihira Y, Yamamura H, Murakami I. Effects of introducing methacrylic and acrylic acid groups on the molecular relaxation of poly(isopropyl methacrylate). J MACROMOL SCI B 2006. [DOI: 10.1080/00222348708248065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Rekharsky MV, Yamamura H, Inoue C, Kawai M, Osaka I, Arakawa R, Shiba K, Sato A, Ko YH, Selvapalam N, Kim K, Inoue Y. Chiral Recognition in Cucurbituril Cavities. J Am Chem Soc 2006; 128:14871-80. [PMID: 17105297 DOI: 10.1021/ja063323p] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
For the first time, achiral cucurbiturils (CBs) were endowed with significant enantiomeric and distereomeric discrimination by incorporating a strong chiral binder. Calorimetric, nuclear magnetic, light-scattering, and mass spectral studies revealed that (S)-2-methylbutylamine (as a strong binder) can be discriminated by two enantiomeric supramolecular hosts, composed of CB[6] and (R)- or (S)-2-methylpiperazine, with an unprecedented 95% enantioselectivity in aqueous NaCl solution. This is the highest enantioselectivity ever reported for a supramolecular system derived from an achiral host. Similarly, CB[7], with a larger cavity, exhibited diastereoselectivities up to 8 times higher for diastereomeric dipeptides, as demonstrated for L-Phe-L-Leu-NH3+ versus L-Phe-D-Leu-NH3+.
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Kitagawa M, Okada M, Yamamura H, Kanayama K, Sakai T. Diagnosis of olfactory neuroblastoma in a dog by magnetic resonance imaging. Vet Rec 2006; 159:288-9. [PMID: 16946314 DOI: 10.1136/vr.159.9.288] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Takahashi K, Yamamura H, Iuchi R, Murai J, Hirano N, Tamura A, Kodama K. 208 Calponin-targeting oncolytic Herpes simplex virus (HSV-1) as a novel therapeutic agent for sarcomatous mesothelioma. Lung Cancer 2006. [DOI: 10.1016/s0169-5002(07)70284-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Okada M, Koie H, Kitagawa M, Kanayama K, Sato T, Yamamura H, Sakai T. MRI findings of haematomyelia in a dog with spontaneous systemic haemorrhage. Aust Vet J 2006; 84:332-5. [PMID: 16958632 DOI: 10.1111/j.1751-0813.2006.00034.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
A 7-year-old female cross-breed dog was brought to Nihon University Animal Medical Center for investigation of tetraplegia. Lameness in the pelvic limbs, that had developed 2 weeks previously, had progressed to tetraplegia. On magnetic resonance imaging of the spinal cord, isointensity was detected from C2 to C4 and T12 to T13, isointensity and hyperintensity were intermingled from L3 to L4, and hyperintensity was detected from L5 to L7 by T1-weighted imaging. On T2-weighted imaging, hyperintensity was detected in all regions described above. The dog recovered from anaesthesia, but died during the day from systemic bleeding as the result of a coagulopathy of unknown aetiology. Histopathological examination revealed haematomyelia in these regions of the spinal cord. This is the first report of magnetic resonance imaging findings of haematomyelia in canine spontaneous systemic haemorrhage. It appeared that the differences in the findings of T1-weighted imaging along the spinal regions reflected time-lags in the occurrence of bleeding.
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Rekharsky MV, Yamamura H, Kawai M, Osaka I, Arakawa R, Sato A, Ko YH, Selvapalam N, Kim K, Inoue Y. Sequential Formation of a Ternary Complex among Dihexylammonium, Cucurbit[6]uril, and Cyclodextrin with Positive Cooperativity. Org Lett 2006; 8:815-8. [PMID: 16494448 DOI: 10.1021/ol0528742] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A unique ternary 1:1:1 cucurbit[6]uril (CB[6])-cyclodextrin (CD)-dihexylammonium (DHA) complex was designed and noncovalently synthesized in stepwise fashion: first, CB[6] interacts strongly with DHA to form a 1:1 complex; second, addition of CD into the solution of the 1:1 complex leads to the exclusive formation of the 1:1:1 ternary complex. The ternary complex was characterized by various experimental techniques including ITC, NMR, and ESI-MS.
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Yamamura H, Iwata T, Kawai M, Sato A. Electrospray ionization tandem mass spectrometry determined regioisomeric structures of disubstituted beta-cyclodextrin derivatives. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2006; 12:37-42. [PMID: 16531649 DOI: 10.1255/ejms.793] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Electrospray ionization tandem mass spectrometry was applied to the analysis of regiospecifically disubstituted beta-cyclodextrins. Each disubstituted regioisomer showed unique fragmentation, distinguishing each of them unambiguously. These results demonstrate that mass spectrometry is the most straightforward method among those reported in the assignment of regioisomeric structures of these oligosaccharides.
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Kawai M, Nagai U, Inai Y, Yamamura H, Akasaka R, Takagi S, Miwa Y, Taga T. CD spectral study of Dnp derivatives of amino acids and peptides for their configurational and conformational analysis. Biopolymers 2005; 80:186-98. [PMID: 15657880 DOI: 10.1002/bip.20198] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Rules relating the stereochemistry of N-Dnp (Dnp: 2,4-dinitrophenyl) derivatives of alpha-amino acids and peptides and the sign of the Cotton effects at the longest wavelength band (ca. 400 nm) are surveyed. Some new data and insights concerning the CD spectra of Dnp-alpha-amino acids are included: i.e., the spectra of Dnp derivatives as the composite of the corresponding o-nitrophenyl and p-nitrophenyl derivatives; the crystal structure of Dnp-I-phenylalanine and its solid-state CD spectra; the CD spectra of Dnp-alpha-amino acids containing sulfur atom on their side chains; and the theoretical approach to the CD spectra using molecular orbital method-based calculation. Conformational analyses of cyclic and linear peptides by the CD spectra of their Dnp derivatives are also discussed.
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Yamamura H, Rekharsky MV, Ishihara Y, Kawai M, Inoue Y. Factors Controlling the Complex Architecture of Native and Modified Cyclodextrins with Dipeptide (Z-Glu-Tyr) Studied by Microcalorimetry and NMR Spectroscopy: Critical Effects of Peripheral Bis-trimethylamination and Cavity Size. J Am Chem Soc 2004; 126:14224-33. [PMID: 15506789 DOI: 10.1021/ja046612r] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Complex stability constant (K), standard free energy (DeltaG degrees ), reaction enthalpy (DeltaH degrees ), and entropy change (TDeltaS degrees ) for 1:1 inclusion complexation of the diastereomeric dipeptides Z-d/l-Glu-l-Tyr (Z = benzyloxycarbonyl) and its component amino acids (Z-d/l-Glu and N-Ac-Tyr) with native alpha-, beta-, and gamma-cyclodextrins (CDs) and A,X-modified bis(6-trimethylammonio-6-deoxy)-beta-CDs (AX-TMA(2)-beta-CDs) were determined in buffer solution (pH 6.9) at T = 298.15 K by isothermal titration microcalorimetry. Concurrent NMR spectral examinations revealed that the penetration mode and the resulting complex architecture are dramatically altered by the peripheral modification and also by the CD's cavity size. Upon complexation of the ditopic Z-Glu-Tyr guest, native alpha- and beta-CDs preferentially bind the Z's phenyl group, whereas AX-TMA(2)-beta-CDs predominantly include the Tyr's phenol moiety. In contrast, native gamma-CD includes both of the aromatic moieties simultaneously in the same cavity. Furthermore, for isomeric AB-, AC, and AD-TMA(2)-beta-CDs, an inversion of enantioselectivity and a switching of the penetration mode were observed, critically depending on the position of TMA substituents.
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Okada K, Saegusa S, Yamaoka A, Nagasawa A, Yamamura H, Sekiguchi M, Iwasaki T. P-55 Febrile neutrophilic dermatosis in a miniature schnauzer resembling Sweet's syndrome in humans. Vet Dermatol 2004. [DOI: 10.1111/j.1365-3164.2004.00414_55.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yamamura H, Hayakawa M, Iimura Y. Application of sucrose-gradient centrifugation for selective isolation of Nocardia spp. from soil. J Appl Microbiol 2003; 95:677-85. [PMID: 12969279 DOI: 10.1046/j.1365-2672.2003.02025.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
AIMS To devise and evaluate a method for selective isolation of the less abundant actinomycetes, Nocardia spp. in soil. METHODS AND RESULTS This newly developed method is based on differentiating Nocardia from other actinomycete taxa by centrifugation. A water suspension of air-dried soil is centrifuged through a gradient consisting of 10, 20, 30, 40 and 50% sucrose at 240 x g for 30 min. The 20% sucrose layer, which is enriched with Nocardia spp., is then diluted and plated on humic acid-vitamin agar supplemented with antibacterial agents. The proposed method consistently achieved selective isolation of Nocardia spp. in all 14 soil samples tested, which accounted for 5-89% of the total microbial population recovered. Tentative taxonomic characterization based on a restriction fragment length polymorphism (RFLP) analysis of the 16S ribosomal DNA suggested that many of the soil isolates could belong to N. asteroides, N. salmonicida or N. uniformis. CONCLUSIONS Differential centrifugation can successfully and efficiently isolate soil Nocardia populations that are suppressed by conventional dilution plating approaches. SIGNIFICANCE AND IMPACT OF THE STUDY The development and application of new methodologies with which to isolate less-explored actinomycete taxa is important for improving our knowledge about their taxonomy, ecology and industrial applications.
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Kawai M, Hosoda K, Omori Y, Yamamura H, Miwa Y, Taga T. Crystal Structures of Protected Derivatives of α-Alkoxyglycines. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2003. [DOI: 10.1246/bcsj.76.2215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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