通过将 CRISPR/Cpf1 与光遗传学和还原响应基序相结合,我们开发了一种可光激活的交联 crRNA,可在光照下实现精确的基因组编辑。该系统还允许通过外部应用还原剂来终止编辑活动。双刺激响应 CRISPR/Cpf1 编辑过程以独特的 OFF → ON → OFF 顺序运行,使其成为研究时间敏感的生物事件的宝贵工具。
Synthesis of oligonucleotides containing a new azobenzene fragment with efficient photoisomerizability
作者:Kazushige Yamana、Katsushi Kan、Hidehiko Nakano
DOI:10.1016/s0968-0896(99)00244-8
日期:1999.12
, have been synthesized for linkingtwo oligonucelotide segments. It has been found that the azobenzene linkers efficiently undergo trans-cis isomerization by exposing to UV light. The conversion efficiency showed slight dependence on structure or conformation of oligonucleotides attached to the azobenzene chromophore. The cis-form of the azobenzene in oligonucleotides was sufficiently stable at low
Process for the production of perbenzylated 1-0-glycosides
申请人:SCHERING AKTIENGESELLSCHAFT
公开号:US20020002274A1
公开(公告)日:2002-01-03
The invention relates to a process for the production of perbenzylated 1-O-glycosides of general formula I or salts thereof
1
in which
sugar
1
is a monosaccharide that is functionalized in
1
-OH-position,
R represents benzyl,
n means 2, 3 or 4,
means —O—, —S—, —COO— or —NH—
and
L means a straight-chain, branched, saturated or unsaturated C
1
-C
30
carbon chain, which optionally is interrupted or substituted by groups.
The process according to the invention starts from economical starting materials, provides good yields and allows the production of perbenzylated saccharides with 1-O-functionalized side chains on an enlarged scale.