Traceless β-mercaptan-assisted activation of valinyl benzimidazolinones in peptide ligations.

Traceless β-mercaptan-assisted activation of valinyl benzimidazolinones in peptide ligations.
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肽连接中缬氨酰苯并咪唑啉酮的无痕 β-硫醇辅助活化

DOI:
10.1039/c7sc04148a
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发表时间:
2018-02-21
期刊:
影响因子:
8.4
通讯作者:
Dong S
Dong S
中科院分区:
化学1区
文献类型:
--
作者:
Wang Y;Han L;Yuan N;Wang H;Li H;Liu J;Chen H;Zhang Q;Dong S

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在空间位阻Val-Xaa位点处的内部激活策略使能的无痕连接在C-末端缬氨酸残基上的β-组氨酸辅助的无硫醇添加剂条件下完成。具有C-末端β-支链疏水性氨基酸残基的肽基硫酯或其替代物通常在连接反应中表现出差的反应性。因此,需要使用外源添加剂进行活化以确保可接受的反应效率。本文中,我们报道了在温和的无硫醇添加剂的反应条件下在Val-Xaa位点处的无痕连接,由此在C-末端缬氨酸残基上引入β-组氨酸有效地活化否则不反应的N-酰基-苯并咪唑啉酮(Nbz),并且使得能够使用一锅连接-脱硫策略来产生所需的肽产物。β-硫代缬氨酸-Nbz和常规烷基硫酯之间的正交性,以及从容易获得的青霉胺中方便地获得前者,也允许基于动力学控制的一锅法三段连接和脱硫策略加速肽激素β-LPH和hPTH类似物的组装。
An internal activation strategy-enabled traceless ligation at sterically hindered Val-Xaa site is accomplished under thiol additive-free conditions assisted by a β-mercaptan on the C-terminal valine residue. Peptidyl thioesters or their surrogates with C-terminal β-branched hydrophobic amino acid residues usually exhibit poor reactivities in ligation reactions. Thus, activation using exogenous additives is required to ensure an acceptable reaction efficiency. Herein, we report a traceless ligation at Val-Xaa sites under mild thiol additive-free reaction conditions, whereby the introduction of β-mercaptan on the C-terminal valine residue effectively activates the otherwise unreactive N-acyl-benzimidazolinone (Nbz), and enables the use of a one-pot ligation–desulfurization strategy to generate the desired peptide products. The orthogonality between β-thiovaline-Nbz and a conventional alkyl thioester, as well as the convenient access to the former from readily available penicillamine, also allowed expedited assembly of the peptidic hormone β-LPH and hPTH analogues, based on a kinetically controlled one-pot three-segment ligation and desulfurization strategy.
DOI: 10.1002/anie.200801590
发表时间: 2008-01-01
影响因子: 16.6
作者:
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通讯作者: Seitz, Oliver
DOI: 10.1126/science.7973629
发表时间: 1994-11-04
期刊: SCIENCE
影响因子: 56.9
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DOI: 10.1039/c3sc52140k
发表时间: 2014-01-01
期刊: CHEMICAL SCIENCE
影响因子: 8.4
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DOI: 10.1021/ja306637u
发表时间: 2012-09-12
影响因子: 15
作者:
Dong S;Shang S;Li J;Tan Z;Dean T;Maeda A;Gardella TJ;Danishefsky SJ
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DOI: 10.1039/ct9150701080
发表时间: 1915-01-01
期刊: JOURNAL OF THE CHEMICAL SOCIETY
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作者:
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