Presentation is loading. Please wait.

Presentation is loading. Please wait.

Jet-FTIR Studies of Model Peptide Systems Corey A. Rice and Martin A. Suhm Institut für Physikalische Chemie Universität Göttingen Tammannstr. 6 D-37077.

Published byRandolph Webb Modified over 9 years ago

Similar presentations

Presentation on theme: "Jet-FTIR Studies of Model Peptide Systems Corey A. Rice and Martin A. Suhm Institut für Physikalische Chemie Universität Göttingen Tammannstr. 6 D-37077."— Presentation transcript:

1 Jet-FTIR Studies of Model Peptide Systems Corey A. Rice and Martin A. Suhm Institut für Physikalische Chemie Universität Göttingen Tammannstr. 6 D-37077 Göttingen, Germany 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

2 Outline Motivation Motivation Experimental Setup Experimental Setup Model compounds Model compounds Formamide, N-Methylformamide and Formamide, N-Methylformamide andN-Methylacetamide Protected Glycine Protected Glycine Conclusions and Outlook Conclusions and Outlook Acknowledgements Acknowledgements 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

3 The Peptide Bond 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman N CR H R O

4 Motivation Pioneers of Peptide models in the gas phase Pioneers of Peptide models in the gas phase Simons, Meijer, Gerhards, Zwier, Pratt, etc. Simons, Meijer, Gerhards, Zwier, Pratt, etc. The structure of proteins is determined through hydrogen bonding motifs (i.e.  -helix,  -sheet structures, etc.) The structure of proteins is determined through hydrogen bonding motifs (i.e.  -helix,  -sheet structures, etc.) Through N-H... O=C interactions Through N-H... O=C interactions Secondary, Tertiary and higher-order structures are extremely hard to determine Secondary, Tertiary and higher-order structures are extremely hard to determine A false Primary structure can lead to a false overall structure, which leads to many known diseases A false Primary structure can lead to a false overall structure, which leads to many known diseases Observe the aggregation of small model systems Observe the aggregation of small model systems Aggregation patterns can be determined Aggregation patterns can be determined Large aggregates hard to get into the gas phase Large aggregates hard to get into the gas phase 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

5 Experimental Idea Solvent-free studies Solvent-free studies Through adiabatic expansion conditions Through adiabatic expansion conditions T R ~ 5 – 20 K T R ~ 5 – 20 K molecular collisions molecular collisions molecular interactions (i.e. hydrogen bonds) molecular interactions (i.e. hydrogen bonds) Direct Absorption Infrared Spectroscopy Direct Absorption Infrared Spectroscopy 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

6 Experimental Setup filet: fine but lengthy 600 x 0.2 mm 2 substance 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

7 New Experimental Setup poppet-controlled, resistively-heated nozzle (popcorn-jet) Substance Expansion Magnetic Valve Check Valves 5 x 1 mm 2 h (IR) 2 1 check valve cracking pressure 1.70 mbar 2.680 mbar 175 ms pulse length p 0 = 1.5 – 2.0 bar p b ~ 10 -6 bar Variable Temp. 298 – 500 K 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

8 moderate heating NH(a) NH(s) Free NH D Nozzle Temp. 328 K 298 K Formamide Nozzle Dim./mm 5 x 1 600 x 0.2 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

9 Model Compounds: N-H stretch region Nozzle Temp. 298 K 318 K 298 K Nozzle Dim./mm 600 x 0.2 5 x 1 600 x 0.2 N-Methylformamide N-Methylacetamide Formamide M M D T(?) D D NH(s) NH(a) 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

10 C=O of Formamides Formamide N-Methylformamide Nozzle Temp. 318 K 328 K Nozzle Dim./mm 5 x 1 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

11 Acetylglycine ethyl ester N-H stretch stick spectrum of Ac-Phe-OMe a M D a Gerhards, M.; Unterberg, C. PCCP, 2002, 4, 1760-1765. Nozzle Temp. 363 K p 0 / bar 2.0 } 2 x C=O 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

12 Acetylglycine ethyl ester Amide I stick spectrum of Ac-Phe-OMe a a Gerhards, M.; Unterberg, C.; Gerlach, A. PCCP, 2002, 4, 5563-5565. Nozzle Temp. 363 K p 0 / bar 2.0 D 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

13 Conclusions and Outlook New Experimental Setup New Experimental Setup Model compounds to small protected peptide Model compounds to small protected peptide Aggregation patterns are different Aggregation patterns are different In the future, different protected peptides without a UV-chromophore in the gas phase In the future, different protected peptides without a UV-chromophore in the gas phase High-level ab initio calculations High-level ab initio calculations 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

14 Acknowledgements Prof. Dr. Martin Suhm Prof. Dr. Martin Suhm Everyone in the Suhm Group Everyone in the Suhm Group GRK 782 (www.pcgg.de) funded through the DFG GRK 782 (www.pcgg.de) funded through the DFG 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

15 Thank YOU for your attention! 61 st International Symposium on Molecular Spectroscopy – TB. Infrared/Raman

Download ppt "Jet-FTIR Studies of Model Peptide Systems Corey A. Rice and Martin A. Suhm Institut für Physikalische Chemie Universität Göttingen Tammannstr. 6 D-37077."

Similar presentations

Protein Structure.

Protein Structure.
Conformation Specific Spectroscopic Investigation of β- and α/β-peptides: Insight Into The Amide I and Amide II Spectral Signatures William H. James III,

Conformation Specific Spectroscopic Investigation of β- and α/β-peptides: Insight Into The Amide I and Amide II Spectral Signatures William H. James III,
Conformation-specific IR spectroscopy of cold Ac-Phe-(Ala)5-Lys-H+ Ac-Phe-(Ala)10-Lys-H+ Ac-Lys-Phe-(Ala)10-H+ Spectroscopic signatures of helix.

Conformation-specific IR spectroscopy of cold Ac-Phe-(Ala)5-Lys-H+ Ac-Phe-(Ala)10-Lys-H+ Ac-Lys-Phe-(Ala)10-H+ Spectroscopic signatures of helix.
Chiral recognition in molecular clusters N. Borho, M. A. Suhm Institute of Physical Chemistry, University of Göttingen.

Chiral recognition in molecular clusters N. Borho, M. A. Suhm Institute of Physical Chemistry, University of Göttingen.
Tutorials 3-methyl-3-buten-1-ol. IR spectroscopy is all about identifying the functional groups of a chemical compound. Recall that a functional group.

Tutorials 3-methyl-3-buten-1-ol. IR spectroscopy is all about identifying the functional groups of a chemical compound. Recall that a functional group.
17.1 Mass Spectrometry Learning Objectives:

17.1 Mass Spectrometry Learning Objectives:
Molecular Structure and Organic Chemistry The structure of a molecule refers to the arrangement of atoms within the molecule. The structure of a molecule.

Molecular Structure and Organic Chemistry The structure of a molecule refers to the arrangement of atoms within the molecule. The structure of a molecule.
Amide Proton Exchange NH + H* -> NH* + H Forms of H – 1 H, 2 H, 3 H, 1 H sat Amide NH usually measured –Thiol SH, Hydroxyl/Carboxyl OH, Amine NH 3 + –CH.

Amide Proton Exchange NH + H* -> NH* + H Forms of H – 1 H, 2 H, 3 H, 1 H sat Amide NH usually measured –Thiol SH, Hydroxyl/Carboxyl OH, Amine NH 3 + –CH.
1. Primary Structure: Polypeptide chain Polypeptide chain Amino acid monomers Peptide linkages Figure 3.6 The Four Levels of Protein Structure.

1. Primary Structure: Polypeptide chain Polypeptide chain Amino acid monomers Peptide linkages Figure 3.6 The Four Levels of Protein Structure.
Today: IR Next time: (see our website!) Partition coefficient and partition calculations Separations of mixtures.

Today: IR Next time: (see our website!) Partition coefficient and partition calculations Separations of mixtures.
HIGH RESOLUTION INFRARED SPECTROSCOPY OF N 2 O-C 4 H 2 AND CS 2 −C 2 D 2 DIMERS MAHDI YOUSEFI S. SHEYBANI-DELOUI JALAL NOROOZ OLIAEE BOB MCKELLAR NASSER.

HIGH RESOLUTION INFRARED SPECTROSCOPY OF N 2 O-C 4 H 2 AND CS 2 −C 2 D 2 DIMERS MAHDI YOUSEFI S. SHEYBANI-DELOUI JALAL NOROOZ OLIAEE BOB MCKELLAR NASSER.
Time out—states and transitions Spectroscopy—transitions between energy states of a molecule excited by absorption or emission of a photon h =  E = E.

Time out—states and transitions Spectroscopy—transitions between energy states of a molecule excited by absorption or emission of a photon h =  E = E.
Infrared spectroscopy of Li(methylamine) n (NH 3 ) m clusters Nitika Bhalla, Luigi Varriale, Nicola Tonge and Andrew Ellis Department of Chemistry University.

Infrared spectroscopy of Li(methylamine) n (NH 3 ) m clusters Nitika Bhalla, Luigi Varriale, Nicola Tonge and Andrew Ellis Department of Chemistry University.
Characterization of Ion-Driven Conformations in Diphenylacetylene Molecular Switches Arron Wolk Johnson Lab Yale University.

Characterization of Ion-Driven Conformations in Diphenylacetylene Molecular Switches Arron Wolk Johnson Lab Yale University.
IR spectroscopy of first-row transition metal clusters and their complexes with simple molecules FELIX facility, Radboud University Nijmegen, the Netherlands.

IR spectroscopy of first-row transition metal clusters and their complexes with simple molecules FELIX facility, Radboud University Nijmegen, the Netherlands.
Wybren Jan Buma Molecular Photonics van ‘t Hoff Institute for Molecular Sciences University of Amsterdam Mechanically interlocked molecules in the gas.

Wybren Jan Buma Molecular Photonics van ‘t Hoff Institute for Molecular Sciences University of Amsterdam Mechanically interlocked molecules in the gas.
Georg-August-Universitaet Goettingen Tobias N. Wassermann Institute of Physical Chemistry Goettingen 19/06/2006 61st Ohio State University Symposium on.

Georg-August-Universitaet Goettingen Tobias N. Wassermann Institute of Physical Chemistry Goettingen 19/06/ st Ohio State University Symposium on.
A New Spectrometer For High Resolution Measurements of THz Transitions in Cold Carbon Clusters Martin Philipp, Michael Caris, Thomas Giesen, Stephan Schlemmer.

A New Spectrometer For High Resolution Measurements of THz Transitions in Cold Carbon Clusters Martin Philipp, Michael Caris, Thomas Giesen, Stephan Schlemmer.
Electronic spectroscopy of Li(NH 3 ) 4 Nitika Bhalla, Luigi Varriale, Nicola Tonge and Andrew Ellis Department of Chemistry University of Leicester UK.

Electronic spectroscopy of Li(NH 3 ) 4 Nitika Bhalla, Luigi Varriale, Nicola Tonge and Andrew Ellis Department of Chemistry University of Leicester UK.
Laser spectroscopy of Iridium monophosphide H. F. Pang, Y. Xia, A. W. Liu and A. S-C. Cheung Department of Chemistry, The University of Hong Kong, Pokfulam.

Laser spectroscopy of Iridium monophosphide H. F. Pang, Y. Xia, A. W. Liu and A. S-C. Cheung Department of Chemistry, The University of Hong Kong, Pokfulam.

Similar presentations

Ads by Google