Purification and Characterization of a Monohalomethane-producing Enzyme S-adenosyl-L-methionine: Halide Ion Methyltransferase from a Marine Microalga, Pavlova pinguis
A monohalomethane-producing enzyme, S-adenosyl-L-methionine-dependent halide ion methyltransferase (EC 2.1.1.-) was purified from the marine microalga Pavlova pinguis by two anion exchange, hydroxyapatite and gel filtration chromatographies. The methyltransferase was a monomeric molecule having a molecular weight of 29,000. The enzyme had an isoelectric point at 5.3, and was optimally active at pH 8.0. The Km for iodide and SAM were 12 mM and 12 μM, respectively, which were measured using a partially purified enzyme. Various metal ions had no significant effect on methyl iodide production, suggesting that the enzyme does not require metal ions. The enzyme reaction strictly depended on SAM as a methyl donor, and the enzyme catalyzed methylation of the I-, Br-, and Cl- to corresponding monohalomethanes and of bisulfide to methyl mercaptan.
通过阴离子交换、羟基磷灰石和凝胶过滤两种色谱法,从海洋微藻 Pavlova pinguis 中纯化出了一种产生单卤甲烷的酶--S-腺苷-L-蛋氨酸依赖性卤离子甲基转移酶(EC 2.1.1.-)。甲基转移酶为单体分子,分子量为 29 000。该酶的等电点为 5.3,在 pH 值为 8.0 时活性最佳。使用部分纯化的酶测得碘化物和 SAM 的 Km 值分别为 12 mM 和 12 μM。各种金属离子对碘甲烷的生成没有明显影响,这表明该酶不需要金属离子。该酶反应严格依赖于 SAM 作为甲基供体,该酶催化 I-、Br- 和 Cl-甲基化为相应的单卤代甲烷,催化二硫化物甲基化为甲硫醇。
Antibacterial agents
申请人:Axten MICHAEL Jeffrey
公开号:US20060041123A1
公开(公告)日:2006-02-23
Quinoline and naphthyridine derivatives useful in the treatment of bacterial infections in mammals, particularly humans.
喹啉和萘啶衍生物可用于治疗哺乳动物(尤其是人类)的细菌感染。
Selective Estrogen Receptor Modulator
申请人:Hamaoka Shinichi
公开号:US20120004315A1
公开(公告)日:2012-01-05
The present invention provides a compound represented by the following formula (I);
[wherein T represents a single bond, a C1-C4 alkylene group which may have a substituent and the like;
formula (I-1) represents a single bond or a double bond; A represents a single bond, a bivalent 5- to 14-membered heterocyclic group which may have a substituent and the like; Y represents a single bond and the like; Z represents a methylene group and the like; ring G represents a phenylene group and the like which may condense with a 5- to 6-membered ring and may have a heteroatom; R
a
and R
b
are the same as or different from each other and represent a hydrogen atom and the like; W represents a single bond and the like; R′ represents 1 to 4 independent hydrogen atoms and the like; and R″ represents 1 to 4 independent hydrogen atoms and the like] or a salt thereof, or a hydrate thereof.
Methods of using phenolic guanidine sodium channel blockers
申请人:PARION SCIENCES, Inc.
公开号:US20040198744A1
公开(公告)日:2004-10-07
The present invention relates to sodium channel blockers. The present invention also relates to a variety of methods of treatment using these sodium channel blockers.
本发明涉及钠通道阻滞剂。本发明还涉及使用这些钠通道阻滞剂的各种治疗方法。
Sodium channel blockers
申请人:PARION SCIENCES, Inc.
公开号:US20040198746A1
公开(公告)日:2004-10-07
The present invention relates to sodium channel blockers. The present invention also relates to a variety of methods of treatment using these sodium channel blockers.