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    • 12. 发明申请
    • KDO ALDOLASE AND CONDENSATION REACTIONS EMPLOYED THEREWITH
    • KDO ALDOLASE和冷凝反应
    • WO9414954A3
    • 1994-09-29
    • PCT/US9312367
    • 1993-12-17
    • SCRIPPS RESEARCH INSTWONG CHI HUEYSUGAI TAKESHISHEN GWO JENN
    • WONG CHI-HUEYSUGAI TAKESHISHEN GWO-JENN
    • C07H7/027C12N9/88C12P7/58C12P9/00C12P19/02C07H7/02C12N1/20
    • C12P19/02C07H7/027C12N9/88C12P7/58C12P9/00Y10S435/822
    • Aureobacterium barkerei strain KDO-37-2 (ATCC 49977) KDO aldolase (EC 4.1.2.23) isolated therefrom are disclosed. The DKDO aldolase is further disclosed to have a broad substrate specificity with respect to its reverse reaction, i.e. the condensation of aldoses with pyruvate to form a wide range of 2-keto-3-deoxy-onic acids, including 2-keto-3-deoxy-nonulosonic acid, 2-keto-3-deoxy-octulosonic acid, 2-keto-3-deoxy-heptulosonic acid, and 2-keto-3-deoxy-hexulosonic acid. In particular, 3-deoxy-D-manno-2-octulosonic acid (D-KDO), a vital component of lipopolysaccharides found in the bacterial outer membrane may be synthesized from D-arabinose and pyruvate in 67 % yield. Additionally, protected forms of the KDO aldolase products, e.g. hexaacetyl 2-keto-3-deoxy-nonulosonic acid and pentaacetyl 2-keto-3-deoxy-octulosonic acid, may be decarboxylated to form the corresponding 2-deoxy-aldoses, e.g. 2-deoxy-octulose and 2-deoxy-heptulose respectively.
    • 公开了从其分离的巴氏杆菌菌株KDO-37-2(ATCC 49977)和KDO醛缩酶(EC 4.1.2.23)。 进一步公开KDO醛缩酶相对于其逆反应具有广泛的底物特异性,即醛糖与丙酮酸的缩合形成宽范围的2-酮-3-脱氧酸,包括2-酮-3- 脱氧 - 非酮酸,2-酮-3-脱氧 - 八环酮酸,2-酮-3-脱氧 - 庚酮酸和2-酮-3-脱氧 - 己酸。 特别地,在D-细菌外膜中发现的脂多糖的重要组分3-脱氧-D-壬烯-2-辛酮酸(D-KDO)可由D-阿拉伯糖和丙酮酸合成,产率67%。 另外,保护形式的KDO醛缩酶产物,例如, 六乙酰基2-酮-3-脱氧 - 非酮缩酮酸和五乙酰基2-酮-3-脱氧 - 八环酮酸可以脱羧以形成相应的2-脱氧醛糖,例如。 2-脱氧 - 八酮糖和2-脱氧 - 七氟醚。
    • 15. 发明公开
    • BIFUNCTIONAL ANTIBIOTICS
    • 双功能抗生素
    • EP1299109A4
    • 2005-06-08
    • EP01927464
    • 2001-04-27
    • SCRIPPS RESEARCH INST
    • WONG CHI-HUEYSUCHECK STEVEN
    • A61K31/70A61K31/704C07H15/224C07H15/232C07H15/234
    • C07H15/234A61K31/70A61K31/704A61K47/552C07H15/224C07H15/232
    • Bifunctional antibiotics that target both bacterial RNA and resistance-causing enzymes are disclosed. The A-site of bacterial 16S rRNA serves as the target site for most aminoglycoside antibiotics. Resistance to this class of antibiotics is frequently developed by microbial enzymatic acetylation, phosphorylation or ribosylation of aminoglycosides, modifications that weaken their interactions with the target RNA. Using surface plasmon resonance (SPR), the binding affinity and stoichiometry of various amino-glycosides have been investigated and it was found that neamine, the key pharmacophore of the deoxystreptamine class of amino-glycosides, binds to the A-site in a two to one stoichiometry with a K d of 10 muM for each binding site. A library of neamine dimers was prepared and their affinities to 16S rRNA A-site were determined by SPR, with K d =40 nM for the best dimer (an ~10 3 -fold increase in affinity). Antibiotic activities of the dimers were determined for several bacterial strains by the Kirby-Bauer method. The most active dimer, based on antibiotic activity, also showed the highest inhibition of in vitro translation (IC 50 =0.055 muM). The latter assay was developed in order to correlate the relationship between SPR-based affinity and translation inhibition. By these combined methods, transport limitations for the semisynthetic aminoglycosides as well as non-ribosomally based antibiotic activity could be determined. Further analysis of these dimers as substrates for aminoglycoside modifying-enzymes identified a neamine dimer that was a potent inhibitor (K is =0.1 muM) of the APH(2'') activity of the bifunctional enzyme AAC(6'')-APH(2''), the primary enzyme responsible for high level gentamicin C resistance in several bacterial strains.