Chemical Synthesis of Proteins with Non-Strategically Placed Cysteines Using Selenazolidine and Selective Deselenization
Although native chemical ligation has enabled the synthesis of hundreds of proteins, not all proteins are accessible through typical ligation conditions. The challenging protein, 125‐residue human phosphohistidine phosphatase 1 (PHPT1), has three cysteines near the C‐terminus, which are not strategi...
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Published in | Angewandte Chemie (International ed.) Vol. 55; no. 3; pp. 992 - 995 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
WEINHEIM
Blackwell Publishing Ltd
18.01.2016
Wiley Wiley Subscription Services, Inc |
Edition | International ed. in English |
Subjects | |
Online Access | Get full text |
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Summary: | Although native chemical ligation has enabled the synthesis of hundreds of proteins, not all proteins are accessible through typical ligation conditions. The challenging protein, 125‐residue human phosphohistidine phosphatase 1 (PHPT1), has three cysteines near the C‐terminus, which are not strategically placed for ligation. Herein, we report the first sequential native chemical ligation/deselenization reaction. PHPT1 was prepared from three unprotected peptide segments using two ligation reactions at cysteine and alanine junctions. Selenazolidine was utilized as a masked precursor for N‐terminal selenocysteine in the middle segment, and, following ligation, deselenization provided the native alanine residue. This approach was used to synthesize both the wild‐type PHPT1 and an analogue in which the active‐site histidine was substituted with the unnatural and isosteric amino acid β‐thienyl‐l‐alanine. The activity of both proteins was studied and compared, providing insights into the enzyme active site.
Stitching a protein together: A synthesis approach is reported using selenazolidine and deselenization to access a protein with non‐strategically placed cysteine residues. The challenging human phosphohistidine phosphatase 1 (PHPT1) protein, a 125‐residue enzyme with three cysteine residues near the C‐terminus, was used as a model system. |
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Bibliography: | Israel Science Foundation German-Israeli Foundation for Scientific Research and Development Council for Higher Education, Israel istex:E8D45B15B3178B16FBA7E017DCAE9088EF61C1F7 ark:/67375/WNG-G07FWCHV-P ArticleID:ANIE201509378 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1433-7851 1521-3773 |
DOI: | 10.1002/anie.201509378 |