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Abstract
Protein semisynthesis-defined herein as the assembly of a protein from a combination of synthetic and recombinant fragments-is a burgeoning field of chemical biology that has impacted many areas in the life sciences. In this review, we provide a comprehensive survey of this area. We begin by discussing the various chemical and enzymatic methods now available for the manufacture of custom proteins containing noncoded elements. This section begins with a discussion of methods that are more chemical in origin and ends with those that employ biocatalysts. We also illustrate the commonalities that exist between these seemingly disparate methods and show how this is allowing for the development of integrated chemoenzymatic methods. This methodology discussion provides the technical foundation for the second part of the review where we cover the great many biological problems that have now been addressed using these tools. Finally, we end the piece with a short discussion on the frontiers of the field and the opportunities available for the future.
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Affiliation(s)
| | - Tom W. Muir
- Department of Chemistry, Princeton University, Frick Laboratory, Princeton, New Jersey 08544, United States
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2
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Pearson CS, Nemati R, Liu B, Zhang J, Scalabrin M, Li Z, Li H, Fabris D, Belfort M, Belfort G. Structure of an engineered intein reveals thiazoline ring and provides mechanistic insight. Biotechnol Bioeng 2018; 116:709-721. [PMID: 30450538 DOI: 10.1002/bit.26875] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 10/18/2018] [Accepted: 10/26/2018] [Indexed: 11/08/2022]
Abstract
We have engineered an intein which spontaneously and reversibly forms a thiazoline ring at the native N-terminal Lys-Cys splice junction. We identified conditions to stablize the thiazoline ring and provided the first crystallographic evidence, at 1.54 Å resolution, for its existence at an intein active site. The finding bolsters evidence for a tetrahedral oxythiazolidine splicing intermediate. In addition, the pivotal mutation maps to a highly conserved B-block threonine, which is now seen to play a causative role not only in ground-state destabilization of the scissile N-terminal peptide bond, but also in steering the tetrahedral intermediate toward thioester formation, giving new insight into the splicing mechanism. We demonstrated the stability of the thiazoline ring at neutral pH as well as sensitivity to hydrolytic ring opening under acidic conditions. A pH cycling strategy to control N-terminal cleavage is proposed, which may be of interest for biotechnological applications requiring a splicing activity switch, such as for protein recovery in bioprocessing.
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Affiliation(s)
- C Seth Pearson
- Howard P Isermann Department of Chemical and Biological Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York
| | - Reza Nemati
- Department of Chemistry, State University of New York, Albany, New York
| | - Binbin Liu
- Laboratory of Computational & Structural Biology, Wadsworth Center, New York State Department of Health, Albany, New York
| | - Jing Zhang
- Laboratory of Computational & Structural Biology, Wadsworth Center, New York State Department of Health, Albany, New York
| | - Matteo Scalabrin
- Department of Chemistry, State University of New York, Albany, New York
| | - Zhong Li
- Laboratory of Computational & Structural Biology, Wadsworth Center, New York State Department of Health, Albany, New York
| | - Hongmin Li
- Laboratory of Computational & Structural Biology, Wadsworth Center, New York State Department of Health, Albany, New York.,Department of Biomedical Sciences, School of Public Health, Albany, State University of New York, Albany, New York
| | - Dan Fabris
- Department of Chemistry, State University of New York, Albany, New York
| | - Marlene Belfort
- Department of Biomedical Sciences, School of Public Health, Albany, State University of New York, Albany, New York.,Department of Biological Sciences, Albany, State University of New York, Albany, New York
| | - Georges Belfort
- Howard P Isermann Department of Chemical and Biological Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York
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3
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Friedel K, Popp MA, Matern JCJ, Gazdag EM, Thiel IV, Volkmann G, Blankenfeldt W, Mootz HD. A functional interplay between intein and extein sequences in protein splicing compensates for the essential block B histidine. Chem Sci 2018; 10:239-251. [PMID: 30713635 PMCID: PMC6333167 DOI: 10.1039/c8sc01074a] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 10/03/2018] [Indexed: 01/28/2023] Open
Abstract
Steric bulk can compensate for a catalytically critical histidine in an intein's active site and promote the N–S acyl shift.
Inteins remove themselves from a precursor protein by protein splicing. Due to the concomitant structural changes of the host protein, this self-processing reaction has enabled many applications in protein biotechnology and chemical biology. We show that the evolved M86 mutant of the Ssp DnaB intein displays a significantly improved tolerance towards non-native amino acids at the N-terminally flanking (–1) extein position compared to the parent intein, in the form of both an artificially trans-splicing split intein and the cis-splicing mini-intein. Surprisingly, side chains with increased steric bulk compared to the native Gly(–1) residue, including d-amino acids, were found to compensate for the essential block B histidine in His73Ala mutants in the initial N–S acyl shift of the protein splicing pathway. In the case of the M86 intein, large (–1) side chains can even rescue protein splicing activity as a whole. With the comparison of three crystal structures, namely of the M86 intein as well as of its Gly(–1)Phe and Gly(–1)Phe/His73Ala mutants, our data supports a model in which the intein's active site can exert a strain by varying mechanisms on the different angles of the scissile bond at the extein–intein junction to effect a ground-state destabilization. The compensatory mechanism of the block B histidine is the first example for the direct functional role of an extein residue in protein splicing. It sheds new light on the extein–intein interplay and on possible consequences of their co-evolution as well as on the laboratory engineering of improved inteins.
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Affiliation(s)
- Kristina Friedel
- Institute of Biochemistry , University of Muenster , Wilhelm-Klemm-Str. 2 , 48149 Münster , Germany .
| | - Monika A Popp
- Structure and Function of Proteins , Helmholtz Centre for Infection Research , Inhoffenstraße 7 , 38124 , Braunschweig , Germany
| | - Julian C J Matern
- Institute of Biochemistry , University of Muenster , Wilhelm-Klemm-Str. 2 , 48149 Münster , Germany .
| | - Emerich M Gazdag
- Structure and Function of Proteins , Helmholtz Centre for Infection Research , Inhoffenstraße 7 , 38124 , Braunschweig , Germany
| | - Ilka V Thiel
- Institute of Biochemistry , University of Muenster , Wilhelm-Klemm-Str. 2 , 48149 Münster , Germany .
| | - Gerrit Volkmann
- Institute of Biochemistry , University of Muenster , Wilhelm-Klemm-Str. 2 , 48149 Münster , Germany .
| | - Wulf Blankenfeldt
- Structure and Function of Proteins , Helmholtz Centre for Infection Research , Inhoffenstraße 7 , 38124 , Braunschweig , Germany.,Institute for Biochemistry, Biotechnology and Bioinformatics , Technische Universität Braunschweig , Spielmannstraße 7 , 38106 Braunschweig , Germany
| | - Henning D Mootz
- Institute of Biochemistry , University of Muenster , Wilhelm-Klemm-Str. 2 , 48149 Münster , Germany .
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4
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Devaraj NK, Perrin CL. Approach control. Stereoelectronic origin of geometric constraints on N-to-S and N-to-O acyl shifts in peptides. Chem Sci 2018; 9:1789-1794. [PMID: 29675223 PMCID: PMC5892126 DOI: 10.1039/c7sc04046f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 01/06/2018] [Indexed: 11/21/2022] Open
Abstract
Intramolecular N-to-S or N-to-O acyl shifts in peptides are of fundamental and practical importance, as they constitute the first step in protein splicing and can be used for the synthesis of thioester-modified peptides required for native chemical ligation. It has been stated that the nucleophile must be positioned anti to the carbonyl oxygen, as in a cis amide. Despite the importance of such reactions, an understanding of this geometric restriction remains obscure. Here we argue that the empirical requirement for positioning the nucleophile is a stereoelectronic effect arising from the ease of approach of the nucleophile to a carbonyl group, not ground-state destabilization. DFT calculations on model amides support our explanation and indicate a significant decrease in both the transition-state energy and the activation energy for a cis amide. However, the approach of the nucleophile must be anti not only to the carbonyl oxygen but also to the nitrogen. The direction of approach is expressed by a new, modified Bürgi-Dunitz angle. Our data shed light on the mechanisms of acyl shifts in peptides, and they explain why a cis peptide might be required for protein splicing. The further implications for acyl shits in homoserine and homocysteine peptides and for aldol condensations are also considered.
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Affiliation(s)
- Neal K Devaraj
- Dept. of Chemistry & Biochemistry , Univ. Calif. San Diego , La Jolla , CA 92093-0358 , USA .
| | - Charles L Perrin
- Dept. of Chemistry & Biochemistry , Univ. Calif. San Diego , La Jolla , CA 92093-0358 , USA .
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5
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Mujika JI, Lopez X. Unveiling the Catalytic Role of B-Block Histidine in the N–S Acyl Shift Step of Protein Splicing. J Phys Chem B 2017; 121:7786-7796. [DOI: 10.1021/acs.jpcb.7b04276] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. I. Mujika
- Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC), P.K. 1072, 20080 Donostia, Euskadi Spain
| | - X. Lopez
- Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC), P.K. 1072, 20080 Donostia, Euskadi Spain
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6
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Minteer CJ, Siegart NM, Colelli KM, Liu X, Linhardt RJ, Wang C, Gomez AV, Reitter JN, Mills KV. Intein-Promoted Cyclization of Aspartic Acid Flanking the Intein Leads to Atypical N-Terminal Cleavage. Biochemistry 2017; 56:1042-1050. [PMID: 28165720 DOI: 10.1021/acs.biochem.6b00894] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Protein splicing is a post-translational reaction facilitated by an intein, or intervening protein, which involves the removal of the intein and the ligation of the flanking polypeptides, or exteins. A DNA polymerase II intein from Pyrococcus abyssi (Pab PolII intein) can promote protein splicing in vitro on incubation at high temperature. Mutation of active site residues Cys1, Gln185, and Cys+1 to Ala results in an inactive intein precursor, which cannot promote the steps of splicing, including cleavage of the peptide bond linking the N-extein and intein (N-terminal cleavage). Surprisingly, coupling the inactivating mutations to a change of the residue at the C-terminus of the N-extein (N-1 residue) from the native Asn to Asp reactivates N-terminal cleavage at pH 5. Similar "aspartic acid effects" have been observed in other proteins and peptides but usually only occur at lower pH values. In this case, however, the unusual N-terminal cleavage is abolished by mutations to catalytic active site residues and unfolding of the intein, indicating that this cleavage effect is mediated by the intein active site and the intein fold. We show via mass spectrometry that the reaction proceeds through cyclization of Asp resulting in anhydride formation coupled to peptide bond cleavage. Our results add to the richness of the understanding of the mechanism of protein splicing and provide insight into the stability of proteins at moderately low pH. The results also explain, and may help practitioners avoid, a side reaction that may complicate intein applications in biotechnology.
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Affiliation(s)
- Christopher J Minteer
- Department of Chemistry, College of the Holy Cross , Worcester, Massachusetts 01610, United States
| | - Nicolle M Siegart
- Department of Chemistry, College of the Holy Cross , Worcester, Massachusetts 01610, United States
| | - Kathryn M Colelli
- Department of Chemistry, College of the Holy Cross , Worcester, Massachusetts 01610, United States
| | | | | | | | - Alvin V Gomez
- Department of Chemistry, College of the Holy Cross , Worcester, Massachusetts 01610, United States
| | - Julie N Reitter
- Department of Chemistry, College of the Holy Cross , Worcester, Massachusetts 01610, United States
| | - Kenneth V Mills
- Department of Chemistry, College of the Holy Cross , Worcester, Massachusetts 01610, United States
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7
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Palei S, Mootz HD. Cyclic Peptides Made by Linking Synthetic and Genetically Encoded Fragments. Chembiochem 2016; 17:378-82. [DOI: 10.1002/cbic.201500673] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Indexed: 12/12/2022]
Affiliation(s)
- Shubhendu Palei
- International Graduate School of Chemistry (GSC-MS); Institute of Biochemistry; University of Muenster; Wilhelm-Klemm-Strasse 2 48149 Münster Germany
| | - Henning D. Mootz
- International Graduate School of Chemistry (GSC-MS); Institute of Biochemistry; University of Muenster; Wilhelm-Klemm-Strasse 2 48149 Münster Germany
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8
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Li Y. Split-inteins and their bioapplications. Biotechnol Lett 2015; 37:2121-37. [DOI: 10.1007/s10529-015-1905-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2015] [Accepted: 06/29/2015] [Indexed: 01/01/2023]
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9
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Schmohl L, Wagner FR, Schümann M, Krause E, Schwarzer D. Semisynthesis and initial characterization of sortase A mutants containing selenocysteine and homocysteine. Bioorg Med Chem 2015; 23:2883-9. [PMID: 25900629 DOI: 10.1016/j.bmc.2015.03.057] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 03/19/2015] [Accepted: 03/21/2015] [Indexed: 12/14/2022]
Abstract
The bacterial transpeptidase sortase A is a well-established tool in protein chemistry and catalyzes the chemoselective ligation of peptides and proteins. During catalysis sortase A cleaves the conserved Leu-Pro-X-Thr-Gly sorting motif at the Thr residue under concomitant thioester formation at active site Cys184. We have used expressed protein ligation (EPL) to generate sortase mutants with Cys184 replaced by selenocysteine (Sec) and homocysteine (Hcy). Sec-sortase showed a moderate 2-3-fold reduction in catalytic activity in contrast to Hcy-sortase which is a poor catalyst with less than 1% of wild-type activity. The sensitivity of the active site nucleophiles towards an alkylation reagent correlated with the pKa values of the mutated residues. Furthermore, the pH-profile of Sec-sortase was shifted to more acidic conditions when compared to the wild-type enzyme. These observations provide information on sortase catalysis and the semisynthetic enzymes might represent useful tools for further biochemical investigations and engineering approaches of sortases A.
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Affiliation(s)
- Lena Schmohl
- Interfaculty Institute of Biochemistry, University of Tuebingen, Hoppe-Seyler-Str. 4, D-72076 Tuebingen, Germany
| | - Felix Roman Wagner
- Interfaculty Institute of Biochemistry, University of Tuebingen, Hoppe-Seyler-Str. 4, D-72076 Tuebingen, Germany
| | - Michael Schümann
- Laboratory of Mass Spectrometry, Leibniz-Institut für Molekulare Pharmakologie, Robert-Rössle-Strasse 10, D-13125 Berlin, Germany
| | - Eberhard Krause
- Laboratory of Mass Spectrometry, Leibniz-Institut für Molekulare Pharmakologie, Robert-Rössle-Strasse 10, D-13125 Berlin, Germany
| | - Dirk Schwarzer
- Interfaculty Institute of Biochemistry, University of Tuebingen, Hoppe-Seyler-Str. 4, D-72076 Tuebingen, Germany.
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10
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Matern JCJ, Bachmann AL, Thiel IV, Volkmann G, Wasmuth A, Binschik J, Mootz HD. Ligation of synthetic peptides to proteins using semisynthetic protein trans-splicing. Methods Mol Biol 2015; 1266:129-143. [PMID: 25560072 DOI: 10.1007/978-1-4939-2272-7_9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Protein trans-splicing using split inteins is a powerful and convenient reaction to chemically modify recombinantly expressed proteins under mild conditions. In particular, semisynthetic protein trans-splicing with one intein fragment short enough to be accessible by solid-phase peptide synthesis can be used to transfer a short peptide segment with the desired synthetic moiety to the protein of interest. In this chapter, we provide detailed protocols for two such split intein systems. The M86 mutant of the Ssp DnaB intein and the MX1 mutant of the AceL-TerL intein are two highly engineered split inteins with very short N-terminal intein fragments of only 11 and 25 amino acids, respectively, and allow the efficient N-terminal labeling of proteins.
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Affiliation(s)
- Julian C J Matern
- Department of Chemistry and Pharmacy, Institute of Biochemistry, University of Muenster, Wilhelm-Klemm-Str. 2, 48149, Münster, Germany
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11
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Uprety R, Luo J, Liu J, Naro Y, Samanta S, Deiters A. Genetic Encoding of Caged Cysteine and Caged Homocysteine in Bacterial and Mammalian Cells. Chembiochem 2014; 15:1793-9. [DOI: 10.1002/cbic.201400073] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Indexed: 12/19/2022]
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12
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Eryilmaz E, Shah NH, Muir TW, Cowburn D. Structural and dynamical features of inteins and implications on protein splicing. J Biol Chem 2014; 289:14506-11. [PMID: 24695731 DOI: 10.1074/jbc.r113.540302] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Protein splicing is a posttranslational modification where intervening proteins (inteins) cleave themselves from larger precursor proteins and ligate their flanking polypeptides (exteins) through a multistep chemical reaction. First thought to be an anomaly found in only a few organisms, protein splicing by inteins has since been observed in microorganisms from all domains of life. Despite this broad phylogenetic distribution, all inteins share common structural features such as a horseshoe-like pseudo two-fold symmetric fold, several canonical sequence motifs, and similar splicing mechanisms. Intriguingly, the splicing efficiencies and substrate specificity of different inteins vary considerably, reflecting subtle changes in the chemical mechanism of splicing, linked to their local structure and dynamics. As intein chemistry has widespread use in protein chemistry, understanding the structural and dynamical aspects of inteins is crucial for intein engineering and the improvement of intein-based technologies.
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Affiliation(s)
- Ertan Eryilmaz
- From the Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461 and
| | - Neel H Shah
- the Department of Chemistry, Frick Laboratory, Princeton University, Princeton, New Jersey 08544
| | - Tom W Muir
- the Department of Chemistry, Frick Laboratory, Princeton University, Princeton, New Jersey 08544
| | - David Cowburn
- From the Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461 and
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13
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Abstract
Inteins are nature's escape artists; they facilitate their excision from flanking polypeptides (exteins) concomitant with extein ligation to produce a mature host protein. Splicing requires sequential nucleophilic displacement reactions catalyzed by strategies similar to proteases and asparagine lyases. Inteins require precise reaction coordination rather than rapid turnover or tight substrate binding because they are single turnover enzymes with covalently linked substrates. This has allowed inteins to explore alternative mechanisms with different steps or to use different methods for activation and coordination of the steps. Pressing issues include understanding the underlying details of catalysis and how the splicing steps are controlled.
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Affiliation(s)
- Kenneth V Mills
- From the Department of Chemistry, College of the Holy Cross, Worcester, Massachusetts 01610
| | - Margaret A Johnson
- the Department of Chemistry, University of Alabama at Birmingham, Birmingham, Alabama 35294, and
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14
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Wasmuth A, Ludwig C, Mootz HD. Structure-activity studies on the upstream splice junction of a semisynthetic intein. Bioorg Med Chem 2013; 21:3495-503. [PMID: 23618706 DOI: 10.1016/j.bmc.2013.03.065] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 03/24/2013] [Accepted: 03/26/2013] [Indexed: 01/30/2023]
Abstract
Protein trans-splicing by split inteins holds great potential for the chemical modification and semisynthesis of proteins. However, the structural requirements of the extein sequences immediately flanking the intein are only poorly understood. This knowledge is of particular importance for protein labeling, when synthetic moieties are to be attached to the protein of interest as seamlessly as possible. Using the semisynthetic Ssp DnaB intein both in form of its wild-type sequence and its evolved M86 mutant, we systematically varied the sequence upstream of the short synthetic Int(N) fragment using both proteinogenic amino acids and unnatural building blocks. We could show for the wild-type variant that the native N-extein sequence could be reduced to the glycine residue at the (-1) position directly flanking the intein without significant loss of activity. The glycine at this position is strongly preferred over building blocks containing a phenyl group or extended alkyl chain adjacent to the scissile amide bond of the N-terminal splice junction. Despite their negative effects on the splicing yields, these unnatural substrates were well processed in the N-S acyl shift to form the respective thioesters and did not result in an increased decoupling of the asparagine cyclization step at the C-terminal splicing junction. Therefore, the transesterification step appeared to be the bottleneck of the protein splicing pathway. The fluorophore 7-hydroxycoumarinyl-4-acetic acid as a minimal N-extein was efficiently ligated to the model protein, in particular with the M86 mutant, probably because of its higher resemblance to glycine with an aliphatic c-α carbon atom at the (-1) position. This finding indicates a way for the virtually traceless labeling of proteins without inserting extra flanking residues. Due to its overall higher activity, the M86 mutant appears most promising for many protein labeling and chemical modification schemes using the split intein approach.
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Affiliation(s)
- Alexandra Wasmuth
- Institute of Biochemistry, University of Muenster, Wilhelm-Klemm-Str. 2, 48149 Münster, Germany
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15
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Volkmann G, Mootz HD. Recent progress in intein research: from mechanism to directed evolution and applications. Cell Mol Life Sci 2013; 70:1185-206. [PMID: 22926412 PMCID: PMC11113529 DOI: 10.1007/s00018-012-1120-4] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 07/23/2012] [Accepted: 08/06/2012] [Indexed: 10/27/2022]
Abstract
Inteins catalyze a post-translational modification known as protein splicing, where the intein removes itself from a precursor protein and concomitantly ligates the flanking protein sequences with a peptide bond. Over the past two decades, inteins have risen from a peculiarity to a rich source of applications in biotechnology, biomedicine, and protein chemistry. In this review, we focus on developments of intein-related research spanning the last 5 years, including the three different splicing mechanisms and their molecular underpinnings, the directed evolution of inteins towards improved splicing in exogenous protein contexts, as well as novel applications of inteins for cell biology and protein engineering, which were made possible by a clearer understanding of the protein splicing mechanism.
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Affiliation(s)
- Gerrit Volkmann
- Institute of Biochemistry, University of Münster, Wilhelm-Klemm-Str. 2, 48149 Münster, Germany
| | - Henning D. Mootz
- Institute of Biochemistry, University of Münster, Wilhelm-Klemm-Str. 2, 48149 Münster, Germany
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16
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Binschik J, Mootz HD. Chemical bypass of intein-catalyzed N-S acyl shift in protein splicing. Angew Chem Int Ed Engl 2013; 52:4260-4. [PMID: 23468274 DOI: 10.1002/anie.201208863] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 12/13/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Jens Binschik
- Institute of Biochemistry, University of Muenster, Wilhelm-Klemm-Str. 2, 48149 Münster, Germany
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17
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Binschik J, Mootz HD. Chemischer “Bypass” des Intein-katalysierten N-S-Acyltransfers im Proteinspleißen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201208863] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Liu M, Lin S, Ding J, Gao W, Wu H, Chen J. Decarboxylation of isatoic anhydrides with disulfides: an efficient and general synthesis of S-aryl 2-aminobenzothioate derivatives. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.01.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Peudru F, Legay R, Lohier JF, Reboul V, Gulea M. Facile access to γ-aminothiols from 1,3-thiazines via a microwave-assisted three-component reaction. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.08.072] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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