1
|
Mekhael MKG, Linden A, Heimgartner H. Reactions with 4-Hydroxy-2-methylbutananilides: Unexpected Formation of a Cyclopropanecarboxamide. Helv Chim Acta 2011. [DOI: 10.1002/hlca.201000370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
2
|
Li CP, Enomoto H, Hayashi Y, Zhao H, Aoki T. Recent advances in phosphorylation of food proteins: A review. Lebensm Wiss Technol 2010. [DOI: 10.1016/j.lwt.2010.03.016] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
3
|
Cheruku P, Paptchikhine A, Church TL, Andersson PG. Iridium-N,P-Ligand-Catalyzed Enantioselective Hydrogenation of Diphenylvinylphosphine Oxides and Vinylphosphonates. J Am Chem Soc 2009; 131:8285-9. [DOI: 10.1021/ja901437t] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pradeep Cheruku
- Department of Biochemistry and Organic Chemistry, Uppsala University, Box 576, 751 23 Uppsala, Sweden
| | - Alexander Paptchikhine
- Department of Biochemistry and Organic Chemistry, Uppsala University, Box 576, 751 23 Uppsala, Sweden
| | - Tamara L. Church
- Department of Biochemistry and Organic Chemistry, Uppsala University, Box 576, 751 23 Uppsala, Sweden
| | - Pher G. Andersson
- Department of Biochemistry and Organic Chemistry, Uppsala University, Box 576, 751 23 Uppsala, Sweden
| |
Collapse
|
4
|
Affiliation(s)
- Arlen W. Frank
- a U.S. Department of Agriculture , Southern Regional Research Center, Agricultural Research Service , New Orleans, Louisiana, 70179
| |
Collapse
|
5
|
Boukallaba K, Elachqar A, El Hallaoui A, Alami A, El Hajji S, Labriti B, Martinez J, Rolland V. Synthesis of New α-Heterocyclic α-Aminophosphonates. PHOSPHORUS SULFUR 2006. [DOI: 10.1080/10426500500272046] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- K. Boukallaba
- a Laboratoire de Chimie Organique, Faculté des Sciences Dhar El Mehraz , Université Sidi Mohamed Ben Abdellah , Fès , Maroc
| | - A. Elachqar
- a Laboratoire de Chimie Organique, Faculté des Sciences Dhar El Mehraz , Université Sidi Mohamed Ben Abdellah , Fès , Maroc
| | - A. El Hallaoui
- a Laboratoire de Chimie Organique, Faculté des Sciences Dhar El Mehraz , Université Sidi Mohamed Ben Abdellah , Fès , Maroc
| | - A. Alami
- a Laboratoire de Chimie Organique, Faculté des Sciences Dhar El Mehraz , Université Sidi Mohamed Ben Abdellah , Fès , Maroc
| | - S. El Hajji
- a Laboratoire de Chimie Organique, Faculté des Sciences Dhar El Mehraz , Université Sidi Mohamed Ben Abdellah , Fès , Maroc
| | - B. Labriti
- b Laboratoire des Aminoacides, Peptides et Protéines (LAPP) , Université Montpellier 2 , France
| | - J. Martinez
- b Laboratoire des Aminoacides, Peptides et Protéines (LAPP) , Université Montpellier 2 , France
| | - V. Rolland
- b Laboratoire des Aminoacides, Peptides et Protéines (LAPP) , Université Montpellier 2 , France
| |
Collapse
|
6
|
Al-Dhaheri MH, Rowan BG. Application of phosphorylation site-specific antibodies to measure nuclear receptor signaling: characterization of novel phosphoantibodies for estrogen receptor alpha. NUCLEAR RECEPTOR SIGNALING 2006; 4:e007. [PMID: 16741565 PMCID: PMC1472668 DOI: 10.1621/nrs.04007] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2005] [Accepted: 02/21/2006] [Indexed: 01/22/2023]
Abstract
An understanding of posttranslational events in nuclear receptor signaling is crucial for drug design and clinical therapeutic strategies. Phosphorylation is a well-characterized posttranslational modification that regulates subcellular localization and function of nuclear receptors and coregulators. Although the role of single phosphorylation sites in nuclear receptor function has been described, the contribution of combinations of multiple phosphorylation sites to receptor function remains unclear. The development of phosphoantibodies to each phosphorylation site in a nuclear receptor is a powerful tool to address the role of phosphorylation in multiply phosphorylated receptors. However, phosphoantibodies must be rigorously validated prior to use. This review describes the general methodology for design, characterization and validation of phosphoantibodies using the example of eight phosphoantibodies raised against phosphorylation sites in estrogen receptor alpha (ERalpha).
Collapse
|
7
|
George KM, Schule T, Sandoval LE, Jennings LL, Taylor P, Thompson CM. Differentiation between acetylcholinesterase and the organophosphate-inhibited form using antibodies and the correlation of antibody recognition with reactivation mechanism and rate. J Biol Chem 2003; 278:45512-8. [PMID: 12933813 DOI: 10.1074/jbc.m304781200] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Two types of polyclonal antibodies were generated from (a) a decapeptide sequence that includes the active site serine of acetylcholinesterase (anti-AChE10S) and (b) the identical decapeptide sequence phosphorylated at the active site serine of acetylcholinesterase (anti-AChE10SP). The anti-AChE10S antiserum was found to specifically recognize native, control, and vehicle-treated recombinant mouse AChE (rMoAChE) but did not recognize rMoAChE that was phosphorylated by the four organophosphate (OP) compounds tested. Conversely the anti-AChE10SP antiserum recognized phosphoserine rMoAChE that resulted from reaction with phosphorous oxychloride (POCl3) but did not recognize native or vehicle-treated rMoAChE. Anti-AChE10SP also did not recognize OP-AChE conjugates that resulted from the reaction of rMoAChE with other OP compounds that afford neutral or monoanionic phosphoserine groups thereby indicating a high specificity for a precise OP conjugate. Antisera recognition correlated well with the rates of enzyme inhibition, aging, and oxime-induced reactivation indicating these antisera can both quantify the extent and type of inhibition and also differentiate between select mechanisms of inhibition. The ability to discern mechanistic differences between native AChE and OP-AChE conjugates suggests that these antisera can be used to identify biomarkers of OP exposure in a mechanism-based approach.
Collapse
Affiliation(s)
- Kathleen M George
- Center for Environmental Health Sciences, The University of Montana, Missoula, Montana 59812, USA
| | | | | | | | | | | |
Collapse
|
8
|
Agami C, Couty F, Rabasso N. An efficient asymmetric synthesis of azetidine 2-phosphonic acids. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00868-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
9
|
Castelot-Deliencourt G, Pannecoucke X, Quirion JC. Diastereoselective synthesis of α-substituted β-amidophosphonates. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(00)02145-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
10
|
Abstract
Phosphorylation and dephosphorylation are key events in protein expression and regulation and in signal transduction. Phosphopeptides are very useful reagents for the study of these processes, and have been used to great advantage in the study of phosphatase substrate specificity, SH2 domain ligand specificity, and protein-protein interactions. Furthermore, the advent of cell-permeable peptide carriers, such as those from the antennapedia homeodomain and the HIV TAT transcription factor, has allowed the study of intracellular events, thus underscoring the utility of these reagents. In this paper we review methods for the synthesis of phosphopeptides with the emphasis on the preparation of phosphoamino acid building blocks.
Collapse
Affiliation(s)
- J S McMurray
- Department of Neuro-Oncology, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA.
| | | | | | | |
Collapse
|
11
|
Deng CH, Yan-Mei L, Xu N, Zhao YF. Synthesis of N-Phosphoamino Acids with Long Dialkoxy Chains. JOURNAL OF CHEMICAL RESEARCH 1999. [DOI: 10.1177/174751989902301001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
N-phosphoamino acids with long dialkoxy chains are synthesized and spectral data given.
Collapse
Affiliation(s)
- Chang-Hui Deng
- Bio-Organic Phosphorus Chemistry Laboratory, Department of Chemistry, Tsinghua University, Beijing 100084, P.R. China
| | - Li Yan-Mei
- Bio-Organic Phosphorus Chemistry Laboratory, Department of Chemistry, Tsinghua University, Beijing 100084, P.R. China
| | - Ning Xu
- Bio-Organic Phosphorus Chemistry Laboratory, Department of Chemistry, Tsinghua University, Beijing 100084, P.R. China
| | - Yu-Fen Zhao
- Bio-Organic Phosphorus Chemistry Laboratory, Department of Chemistry, Tsinghua University, Beijing 100084, P.R. China
| |
Collapse
|
12
|
Liehr S, Chenault HK. A comparison of the alpha-helix forming propensities and hydrogen bonding properties of serine phosphate and alpha-amino-gamma-phosphonobutyric acid. Bioorg Med Chem Lett 1999; 9:2759-62. [PMID: 10509930 DOI: 10.1016/s0960-894x(99)00469-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The ability of serine phosphate (SerP) or alpha-amino-gamma-phosphonobutyric acid (AbuP) and arginine to form a salt bridge between their side chains appears to be much greater when they are spaced i/i+4 than when they are spaced i/i+3. The side chain-side chain interaction between SerP/Arg and AbuP/Arg, positioned i/i+4, contribute 0.45 and 0.62 kcal mol(-1), respectively, toward stabilizing the alpha-helical conformation of a peptide.
Collapse
Affiliation(s)
- S Liehr
- Department of Chemistry and Biochemistry, University of Delaware, Newark 19711, USA
| | | |
Collapse
|
13
|
Lu HY, Zhang NJ, Chen X, Fu H, Zhao YF. Direct Thiophosphorylation of Amino Acids and Peptides. SYNTHETIC COMMUN 1998. [DOI: 10.1080/00397919808007003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Hai-Yan Lu
- a Bioorganic Phosphorus Chemistry Lab., Department of Chemistry , Tsinghua University , Beijing , 100084 , China
| | - Nan-Jing Zhang
- a Bioorganic Phosphorus Chemistry Lab., Department of Chemistry , Tsinghua University , Beijing , 100084 , China
| | - Xin Chen
- a Bioorganic Phosphorus Chemistry Lab., Department of Chemistry , Tsinghua University , Beijing , 100084 , China
| | - Hua Fu
- a Bioorganic Phosphorus Chemistry Lab., Department of Chemistry , Tsinghua University , Beijing , 100084 , China
| | - Yu-Fen Zhao
- a Bioorganic Phosphorus Chemistry Lab., Department of Chemistry , Tsinghua University , Beijing , 100084 , China
| |
Collapse
|
14
|
Affiliation(s)
- J W Perich
- School of Chemistry, University of Melbourne, Parkville, Victoria, Australia
| |
Collapse
|
15
|
Shapiro G, Büchler D, Dalvit C, Frey P, Fernández MC, Gomez-Lor B, Pombo-Villar E, Stauss U, Swoboda R, Waridel C. Combined Fmoc-Alloc strategy for a general SPPS of phosphoserine peptides; preparation of phosphorylation-dependent tau antisera. Bioorg Med Chem 1997; 5:147-56. [PMID: 9043666 DOI: 10.1016/s0968-0896(96)00211-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A block method for the solid phase synthesis (SPPS) of serine phosphopeptides has been developed using a combination of Fmoc and Alloc strategies. Alloc-Ser[PO(OCH2CH CH2)2] OH2, prepared in a one pot procedure from Alloc-Ser-OH, was introduced at the N-terminus of a sequence prepared by standard Fmoc-SPPS. Global cleavage of the allyl ester based protecting groups, followed by coupling of a tripeptide fragment, led to the tau phosphopeptide, 1. Using tau phosphopeptides a series of phosphorylation state-dependent antisera to human tau protein have been raised. These antisera are valuable tools for studying the tau protein which is found in an abnormal, hyperphosphorylated form in Alzheimer's disease brain.
Collapse
Affiliation(s)
- G Shapiro
- Preclinical Research, Sandoz Pharma Ltd, Basel, Switzerland
| | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Perich JW, Alewood PF, Johns RB. 31P NMR SPECTROSCOPY STUDIES ON THE DIORGANYLPHOSPHOROCHLORIDATE/PYRIDINE PHOSPHORYLATION PROCEDURE. PHOSPHORUS SULFUR 1995. [DOI: 10.1080/10426509508042039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
17
|
Abstract
Whole cell extracts from rat liver or spinach leaves contain divalent ion-independent protein histidine phosphatase activity due to phosphatases of the PP1/PP2A family. In the rat liver extract, almost all the activity was found in the PP1, PP2A1 and PP2A2 peaks. In the spinach leaf extract, four phosphorylase phosphatase activity peaks were resolved--three containing PP1 and one containing PP2A--and all showed histidine phosphatase activity. Thus, protein histidine phosphatase activity is expressed in the cytosolic forms of protein phosphatases of the PP1/PP2A family in mammalian and plant cells.
Collapse
Affiliation(s)
- H R Matthews
- Biochemistry Department, The University, Dundee, UK
| | | |
Collapse
|
18
|
Gorbics L, Urge L, Otvos L. Comparative and optimized dabsyl-amino acid analysis of synthetic phosphopeptides and glycopeptides. J Chromatogr A 1994; 676:169-76. [PMID: 7921174 DOI: 10.1016/0021-9673(94)80459-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The optimal conditions for amino acid analysis of phosphopeptides and N-acetylglucosamine- and N-acetylgalactosamine-containing glycopeptides were investigated by dabsyl-Cl derivatization and reversed-phase high-performance liquid chromatographic separation. By comparing the chromatographic behaviour of the dabsylated phosphoamino acids and dabsylated aminosugars on three different columns, it appears that the mechanism of binding to the column is different for the two modified dabsyl derivatives. The acid sensitivities of sugar and phosphate groups were also investigated. We found that while the optimal hydrolysis conditions for phosphopeptide analysis are peptide sequence-dependent, there is generally an applicable condition for the highest recovery of glycopeptides. A 1-h gas-phase hydrolysis time seems to be appropriate for the majority of glycopeptides and 1.5 h is suitable for the majority of phosphopeptides. The analysis was extended to the successful verification of the presence of the N-acetylglucosamine and the N-acetylgalactosamine moieties when these sugars were incorporated as parts of a disaccharide side chain of glycopeptides.
Collapse
Affiliation(s)
- L Gorbics
- Wistar Institute of Anatomy and Biology, Philadelphia, PA 19104-4268
| | | | | |
Collapse
|
19
|
Gorbics L, Urge L, Lang E, Szendrei GI, Otvos L. Successful and Rapid Verification of the Presence of a Phosphate Group in Synthetic Phosphopeptides Using the Conditions of Standard Dabs-Cl Amino Acid Analysis. ACTA ACUST UNITED AC 1994. [DOI: 10.1080/10826079408013443] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
20
|
Perich JW, Kelly DP, Reynolds EC. Efficient solution-phase synthesis of multiple O-phosphoseryl-containing peptides related to casein and statherin. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1992; 40:81-8. [PMID: 1446973 DOI: 10.1111/j.1399-3011.1992.tb01453.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The multiple Ser(P)-containing peptides, H-Ser(P)-Ser(P)-Ser(P)-Glu-Glu-NHMe.TFA, H-Asp-Ser(P)-Ser(P)-Glu-Glu-NHMe.TFA and H-Glu-Ser(P)-Ser(P)-Glu-Glu-NHMe.TFA were prepared by the use of Boc-Ser(PO3Ph2)-OH in the Boc mode of solution phase peptide synthesis followed by platinum-mediated hydrogenolytic de-protection of the Ser(PO3Ph2)-containing peptides. The protected peptides were assembled using the mixed anhydride coupling methods with 40% TFA/CH2Cl2 used for removal of the Boc group from intermediate Boc-protected peptides.
Collapse
Affiliation(s)
- J W Perich
- Biochemistry and Molecular Biology Unit, School of Dental Science, University of Melbourne, Victoria, Australia
| | | | | |
Collapse
|
21
|
Paquet A. Further studies on the use of 2,2,2-trichloroethyl groups for phosphate protection in phosphoserine peptide synthesis. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1992; 39:82-6. [PMID: 1294078 DOI: 10.1111/j.1399-3011.1992.tb01559.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Boc-Ser(PO3Tc2)-OH, Z-Ser(PO3Tc2)-OH and Fmoc-Ser(PO3Tc2)-OH, derivatives useful for peptide synthesis, have been obtained in high yields by acylation of H-Ser(PO3Tc2)-OH.CF3COOH. The latter was obtained from Boc- or Z-Ser(PO3Tc2)-OBzl by simultaneous removal of the amino- and carboxy-protecting groups by Pd-catalyzed hydrogenolysis in acetic acid-trifluoroacetic acid solution. Removal of the Tc-protecting group was efficiently achieved by hydrogenolysis in aqueous ethanol.
Collapse
Affiliation(s)
- A Paquet
- Food Research Centre, Department of Agriculture, Ottawa, Ontario, Canada
| |
Collapse
|
22
|
Tsukamoto M, Kato R, Ishiguro K, Uchida T, Sato K. Improved protective groups for phosphate of o-phosphoserine useful for the solid-phase peptide synthesis. Tetrahedron Lett 1991. [DOI: 10.1016/0040-4039(91)85046-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
23
|
Li YC, Zhao YF. SYNTHESIS AND PROPERTIES OF N-(DIISOPROPYLOXYPHOSPHORYL)- CYSTEINE AND ITS DERIVATIVES. PHOSPHORUS SULFUR 1991. [DOI: 10.1080/10426509108036786] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
24
|
|
25
|
Abstract
As a consequence of developments in peptide synthesis, it is now well established that Tyr(P)-containing peptides can be prepared in high yield by the use of Boc-Tyr(PO3Me2)-OH in Boc solution or solid-phase peptide synthesis or Fmoc-Tyr(PO3Me2)-OH in Fmoc/solid-phase peptide synthesis. It is considered that with further developments in solid-phase synthesis techniques and the use of alternative phosphate-protecting groups, the synthesis of large and complex Tyr(P)-containing peptides will be routine.
Collapse
|
26
|
Otvos L, Elekes I, Lee VM. Solid-phase synthesis of phosphopeptides. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1989; 34:129-33. [PMID: 2807730 DOI: 10.1111/j.1399-3011.1989.tb01501.x] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We report the solid-phase synthesis of peptides containing O-phosphoserine. Coupling was with commercially available Fmoc-amino acid pentafluorophenyl esters, with base used at each cycle to cleave Fmoc. Phosphorylation of those serine residues left unprotected on the peptide-resin was achieved with dibenzylphosphochloridate, and finally trifluoroacetic acid was used to remove side-chain protecting groups (including the benzyl groups used for the phosphate), and to cleave the peptide from the resin in the same step. This synthetic strategy enables the preparation of peptides with individual, selectively phosphorylated residues. Alternative approaches to introduce protected phosphate and continue with coupling of further amino acids were less advantageous due to the lability of the phosphate group to base and to steric hindrance.
Collapse
Affiliation(s)
- L Otvos
- Wistar Institute of Anatomy and Biology, Philadelphia, PA
| | | | | |
Collapse
|
27
|
Arendt A, Palczewski K, Moore WT, Caprioli RM, McDowell JH, Hargrave PA. Synthesis of phosphopeptides containing O-phosphoserine or O-phosphothreonine. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1989; 33:468-76. [PMID: 2506143 DOI: 10.1111/j.1399-3011.1989.tb00225.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Peptides containing phosphoserine or phosphothreonine were synthesized by solid phase methods. Phosphoserine and phosphothreonine were incorporated into peptides using Boc-diphenylphosphono esters of serine and threonine and standard DCC/HOBt coupling. The phenylphosphoesters were not removed when the peptides were cleaved from the resin by HF or by trifluoromethane sulfonic acid, but were subsequently removed by catalytic hydrogenation. Phosphopeptides were purified by HPLC and by Fe+3-Chelex chromatography and their identity verified by mass spectrometry. Two peptides, Leu-Arg-Arg-Ala-Ser(P)-Leu-Gly and Leu-Arg-Arg-Ala-Thr(P)-Leu-Gly, were prepared by both enzymatic and chemical methods and had identical properties.
Collapse
Affiliation(s)
- A Arendt
- Department of Ophthalmology, University of Florida, Gainesville
| | | | | | | | | | | |
Collapse
|
28
|
Fransson B, Grehn L, Ragnarsson U. Liquid chromatographic separation of acidic phosphoserine peptides on macroporous copoly(styrene-divinyl-benzene) using amines to regulate retention. J Chromatogr A 1989. [DOI: 10.1016/s0021-9673(00)91290-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
29
|
Otvos L, Hollosi M, Perczel A, Dietzschold B, Fasman GD. Phosphorylation loops in synthetic peptides of the human neurofilament protein middle-sized subunit. JOURNAL OF PROTEIN CHEMISTRY 1988; 7:365-76. [PMID: 3151252 DOI: 10.1007/bf01024886] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Peptides containing 13 and 39 amino acid residues and serine-side-chain-phosphorylated (P) analogues thereof, corresponding to human neurofilament protein middle-sized subunit (NF-M), have been synthesized in order to localize the phosphorylation site of this protein. The secondary structure of the nonphosphorylated peptides, determined by circular dichroism (CD) measurements, predicted secondary structural calculations and energy conformational calculations, was suggested to be a series of alternating type I (III). beta-turns and 3(10) or alpha-helices. By contrast, the phosphorylated peptides exhibit a unique conformation, probably due to salt bridges between the phosphoserine and the lysine residues. This has provided the first clear evidence that phosphorylation induces conformational changes among these synthetic peptides and presumably, in NF proteins as well. These phosphorylation loops might be the major recognition sites of the neurofilament protein-directed kinases.
Collapse
Affiliation(s)
- L Otvos
- Wistar Institute of Anatomy and Biology, Philadelphia, Pennsylvania 19104
| | | | | | | | | |
Collapse
|