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Effect of Microwave Irradiation on Dipeptides and Proteins Derived from Silk During Solvation

Advanced Fiber Materials 2022年第3期4卷 448-456页

作者： Na Li Ying Ma Niuniu Chen Xiaoyu Tang Shanshan Lv State Key Laboratory of Organic-Inorganic Composite Materials Beijing University of Chemical Technology15 BeisanhuanDong RoadChaoyang DistrictBeijing 100029China

Silkworm silk and spider silk have been attracting numerous *** solvation of silkworm silk protein and spider silk protein without hydrolysis of peptide bonds is highly *** irradiation has been proposed for facile extraction of water-soluble silk protein by various liquid ***,microwave exposure can cause hydrolysis of peptide bonds,leading to irreversible degradation of silk *** this study,a series of representative dipeptides and a rationally designed recombinant protein derived from silk protein is employed to investigate the efect of microwave on the stability of the peptide bonds during a long time dissolution process,i.e.,heating at 60℃in a CaCl_(2):CH_(3)CH_(2)OH:H_(2)O(1:2:8)*** demonstrate that microwave irradiation imposes a minor damage and a negligible cleavage of the peptide bonds,compared with the conventional heating *** microwave irradiation treatment suggested in this is suitable for dissolution of silk *** is anticipated that this approach can be developed to a commercial level commercially.

关键词： Silk Protein peptide peptide bond Microwave

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Synthesis and Characteristics of an Aspartame Analogue,L-Asparaginyl L-3-Phenyllactic Acid Methyl Ester

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Acta Biochimica et Biophysica Sinica 2004年第6期36卷 385-389页

作者： Hu TAO1, Da-Fu CUI1, and You-Shang ZHANG1,2* 1Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Shanghai 200031, China Institute of Protein Research, Tongji University, Shanghai 200031, China Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Graduate School of the Chinese Academy of SciencesShanghai 200031 China Institute of Protein Research Tongji UniversityShanghai 200031 China

An aspartame analogue, L-asparaginyl L-3-phenyllactic acid methyl ester was synthesized with aspartic acid replaced by asparagine and peptide bond replaced by ester bond. The aspartic acid of aspartame could be replaced by asparagine as reported in the literature. In this analogue, the hydrogen of amide group could still form a hydrogen bond with the oxygen of ester bond and the ester bond was isosteric with peptide bond. However, the product was not sweet, showing that the peptide bond could not be replaced by ester bond. The peptide C-N bond behaves as a double bond that is not free to rotate and the C, O, N and H atoms are in the same plane. The replacement of peptide bond by ester bond destroyed the unique conformation of peptide bond, resulting in the loss of sweet taste.

关键词： artificial sweetener aspartame derivative peptide bond

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Pbond:Web Server for the Prediction of Proline and Non-Proline cis/trans Isomerization

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Genomics, Proteomics & Bioinformatics 2009年第3期7卷 138-142页

作者： Konstantinos P. Exarchos Themis P. Exarchos Costas Papaloukas Anastassios N. Troganis Dimitrios I. Fotiadis Unit of Medical Technology and Intelligent Information Systems Department of Computer ScienceUniversity of IoanninaIoannina 45110Greece Institute of Biomedical Research and Technology Centre for Research and Technology-Thessaly(CERETETH)Larissa 41222Greece Department of Medical Physics Medical SchoolUniversity of IoanninaIoannina 45110Greece Department of Biological Applications and Technology University of IoanninaIoannina 45110 Greece

Pbond is a web server that predicts the conformation of the peptide bond between any two amino acids. Pbond classifies the peptide bonds into one out of four classes, namely cis imide （cis-Pro）, cis amide （cis-nonPro）, trans imide （trans-Pro） and trans amide （trans-nonPro）. Moreover, for every prediction a reliability index is computed. The underlying structure of the server consists of three stages：（1） feature extraction, （2） feature selection and （3） peptide bond classification. Pbond can handle both single sequences as well as multiple sequences for batch processing. The predictions can either be directly downloaded from the web site or returned via e-mail. The Pbond web server is freely available at http：//195.***.198.21/***.

关键词： peptide bond cis/trans isomerization support vector machine

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Synthesis of Unsymmetric Ureas by Selenium-Catalyzed Oxidative-Reductive Carbonylation with CO

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有机化学 2003年第Z1期23卷 69-70页

作者： MEI Jian-Ting LU Shi-Wei National Engineering Research Center for Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Dalian Naval Institute 696 Jiefang Road Dalian 116018 National Engineering Research Center for Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023

　　Unsymmetric, substituted ureas that contain the peptide bond (NHCONH), many of which possess biological activities, are widely used as herbicides, agrochemicals and pharmaceuticals. [1,2] A series of unsymmetric ureascontaining substituted groups have been synthesized via selenium-catalyzed selective oxidative-reductive carbonylation of amines and nitro compounds with CO instead of phosgene in one-pot reaction. [3,4] These catalytic reactions are important from both synthetic and industrial points of view, because not only the reactions can be proceeded with high selectivity of higher than 99% towards desired unsymmetric ureas, but also there exists a phase-transfer process of the selenium catalyst in thereaction, so that the after-treatment of the catalysts and products from the reaction systems can be easily separated by simple phase separation.……

关键词： biological activities phase separation nitro compounds peptide bond instead of

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