Caerulomycin A(CRM A 1)属于含有2,2'-联吡啶基环核心结构的天然产物家族,目前正在开发作为有效的新型免疫抑制剂。在这里,我们报告氨基转移酶CrmG在1生物合成中的功能表征,动力学分析,底物特异性和结构见解。转氨酶CrmG确认以催化关键氨基转移反应成醛基转化成氨基中的1种生物合成途径,宁愿升谷氨酸盐和升-谷氨酰胺作为氨基供体底物。CrmG的晶体结构与5'-磷酸吡ox醛磷酸盐(PLP)或5'-磷酸吡ox胺磷酸盐(PMP)或受体底物复合形成的晶体结构经确定采用PLP依赖型酶的典型折叠I型,且具有独特的小附加域。结构指导的定点诱变确定了底物结合和催化活性的关键氨基酸残基,从而为CrmG的转氨机制提供了见识。
Iodo- or 2-bromopyridine N-oxides were readily magnesiated with i-PrMgCl·LiCl via the iodine or bromine−magnesium exchange. The bromine adjacent to pyridineN-oxide (at the 2- or 6-position) can be regioselectively magnesiated in the presence of other position substituted halogens. This method was tested in various substituted pyridineN-oxide systems, and has been successfully applied to the total
DIPYRIDYL ALKALOID, PREPARATION METHOD THEREFOR AND USE THEREOF
申请人:OCEAN UNIVERSITY OF CHINA
公开号:US20190322638A1
公开(公告)日:2019-10-24
Disclosed are dipyridyl alkaloid, a preparation method therefor and use thereof. The structure of the dipyridyl alkaloid is as shown in formula I. The dipyridyl alkaloid has a tumor cell proliferation inhibitory activity and can be used as a tumor cell proliferation inhibitor or for developing an anti-tumor drug.
4-Methoxy-2,2'-bipyridyl-6-aldoxime, Verfahren und Zwischenprodukte zu ihrer Herstellung und ihre Verwendung als Arzneimittel
申请人:HOECHST AKTIENGESELLSCHAFT
公开号:EP0159640A1
公开(公告)日:1985-10-30
Die vorliegende Erfindung betrifft die Verbindung 4-Methoxy-2,2'-bipyridyl-6-aldoxim und Isomere und ein Verfahren sowie Zwischenprodukte zu dessen Herstellung. Die Verbindungen können bei der Behandlung von Krankheiten, die durch Bakterien oder Amöben hervorgerufen werden, verwendet werden.
USE OF BIPYRIDINE COMPOUND 'CAERULOMYCIN A', DERIVATIVES AND ANALOGS THEREOF AS IMMUNOSUPPRESSIVE AGENTS
申请人:Council of Scientific and Industrial Research
公开号:EP1942889B1
公开(公告)日:2015-06-03
Use of bipyridine compound 'Caerulomycin A' derivatives and analogs thereof as immunosuppressive agents
申请人:Singla Kumar Arvind
公开号:US20070078167A1
公开(公告)日:2007-04-05
The present invention relates to an isolated bioactive molecule Caerulomycin A, derivatives and analogs thereof as effective immunosuppressive agents. The immunosuppressive property of the compound is targeted in particular against the lymphocytes, CD4
+
T cells, CD8
+
T cells and B cells and in the production of IL-4 and IFN-γ and antibodies. The compound operates through a mechanism by downregulating the expression of activation marker CD28 and upregulating the immunosuppressive marker CTLA-4. Caerulomycin A has previously been isolated from
Streptomyces caeruleus
and found to have useful antifungal activity. Prior to the present invention however, this compound had not been determined to have immunomodulatory activity.