A compound of Formula (I) wherein R is a biomolecular residue, or derivative thereof, of a C-terminal amide biomolecule which is activated by the action of PAM; and X is O or CH2 or a salt, or prodrug thereof.
New Method for the Separation of Diastereomeric Mixtures of β-Methylnorleucine and β-Methylleucine
作者:Kazuo Okubo、Yoshiharu Izumi
DOI:10.1246/bcsj.43.1541
日期:1970.5
β-Methylnorleucine and β-methylleucine were synthesized, separated into diastereomers and optically resolved. The configurational assignments of these isomers and the determinations of the optically active isomers were achieved by means of NMR spectroscopy and the enzymatic method respectively.
LC-MS-Guided Isolation of Cyanogripeptides A–C, Cyclolipopeptides with β-Methyl-Leucine Residues, from an <i>Actinoalloteichus cyanogriseus</i> LHW52806
, and the advanced Marfey’s method. The biosynthetic pathway of cyanogripeptides was deduced by analyzing the genome of A. cyanogriseus LHW52806. Compound 3 exhibitedantibacterialactivityagainstHelicobacterpylori G27, Helicobacterpylori 26695, and Mycolicibacterium smegmatis ATCC607 with MIC values of 32 μg/mL.
氰基肽 A–C ( 1 – 3 ) 是三种具有不寻常 β-甲基-亮氨酸残基的新环脂肽,是使用 LC-MS 引导策略从Actinoalloteichuscyanogriseus LHW52806 中鉴定出来的。通过 1D/2D NMR、HR-MS/MS 和先进的 Marfey 方法阐明了化合物1 – 3的结构。β-甲基-亮氨酸残基的绝对构型通过 (2 S ,3 R )-β-甲基-亮氨酸的立体选择性生物合成、外消旋至其差向异构体 (2 R ,3 R )-β-甲基-的组合来确定。亮氨酸,以及先进的 Marfey 方法。通过对A.基因组的分析,推导了氰基肽的生物合成途径。蓝鲸LHW52806。化合物3对幽门螺杆菌G27、幽门螺杆菌26695和耻垢分枝杆菌ATCC607表现出抗菌活性,MIC值为32 μg/mL。
Asymmetric β‐Methylation of
<scp>l</scp>
‐ and
<scp>d</scp>
‐α‐Amino Acids by a Self‐Contained Enzyme Cascade
作者:Cangsong Liao、Florian P. Seebeck
DOI:10.1002/anie.201916025
日期:2020.4.27
AbstractThis report describes a modular enzyme‐catalyzed cascade reaction that transforms l‐ or d‐α‐amino acids to β‐methyl‐α‐amino acids. In this process an α‐amino acid transaminase, an α‐keto acid methyltransferase, and a halide methyltransferase cooperate in two orthogonal reaction cycles that mediate product formation and regeneration of the cofactor pyridoxal‐5′‐phosphate and the co‐substrate S‐adenosylmethionine. The only stoichiometric reagents consumed in this process are the unprotected l‐ or d‐α‐amino acid and methyl iodide.