Role of Hydrogen Bonding and Helix−Lipid Interactions in Transmembrane Helix Association

2008 ◽  
Vol 130 (20) ◽  
pp. 6456-6462 ◽  
Author(s):  
Jinhyuk Lee ◽  
Wonpil Im
Keyword(s):  
Hydrogen Bonding ◽  
Transmembrane Helix ◽  
Lipid Interactions

Contribution of hydrogen bonding to lipid-lipid interactions in membranes and the role of lipid order: Effects of cholesterol, increased phospholipid unsaturation, and ethanol

Biochemistry ◽  
1993 ◽  
Vol 32 (14) ◽  
pp. 3714-3721 ◽  
Author(s):  
Simon J. Slater ◽  
Cojen Ho ◽  
Frank J. Taddeo ◽  
Mary Beth Kelly ◽  
Christopher D. Stubbs
Keyword(s):  
Hydrogen Bonding ◽  
Order Effects ◽  
Lipid Interactions ◽  
Lipid Order

scholarly journals Deciphering the Role of π-Interactions in Polyelectrolyte Complexes Using Rationally Designed Peptides

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2074
Author(s):  
Sara Tabandeh ◽  
Cristina Elisabeth Lemus ◽  
Lorraine Leon
Keyword(s):  
Hydrogen Bonding ◽  
Phase Separation ◽  
Liquid Phase ◽  
Charge Density ◽  
Secondary Structures ◽  
Liquid Phase Separation ◽  
Polyelectrolyte Complexes ◽  
Π Interactions ◽  
Liquid Liquid Phase Separation

Electrostatic interactions, and specifically π-interactions play a significant role in the liquid-liquid phase separation of proteins and formation of membraneless organelles/or biological condensates. Sequence patterning of peptides allows creating protein-like structures and controlling the chemistry and interactions of the mimetic molecules. A library of oppositely charged polypeptides was designed and synthesized to investigate the role of π-interactions on phase separation and secondary structures of polyelectrolyte complexes. Phenylalanine was chosen as the π-containing residue and was used together with lysine or glutamic acid in the design of positively or negatively charged sequences. The effect of charge density and also the substitution of fluorine on the phenylalanine ring, known to disrupt π-interactions, were investigated. Characterization analysis using MALDI-TOF mass spectroscopy, H NMR, and circular dichroism (CD) confirmed the molecular structure and chiral pattern of peptide sequences. Despite an alternating sequence of chirality previously shown to promote liquid-liquid phase separation, complexes appeared as solid precipitates, suggesting strong interactions between the sequence pairs. The secondary structures of sequence pairs showed the formation of hydrogen-bonded structures with a β-sheet signal in FTIR spectroscopy. The presence of fluorine decreased hydrogen bonding due to its inhibitory effect on π-interactions. π-interactions resulted in enhanced stability of complexes against salt, and higher critical salt concentrations for complexes with more π-containing amino acids. Furthermore, UV-vis spectroscopy showed that sequences containing π-interactions and increased charge density encapsulated a small charged molecule with π-bonds with high efficiency. These findings highlight the interplay between ionic, hydrophobic, hydrogen bonding, and π-interactions in polyelectrolyte complex formation and enhance our understanding of phase separation phenomena in protein-like structures.

Role of disulfide linkages in tachyplesin-lipid interactions

Biochemistry ◽  
1993 ◽  
Vol 32 (43) ◽  
pp. 11704-11710 ◽  
Author(s):  
Katsumi Matsuzaki ◽  
Mitsuya Nakayama ◽  
Masaru Fukui ◽  
Akira Otaka ◽  
Susumu Funakoshi ◽  
...  
Keyword(s):  
Lipid Interactions ◽  
Disulfide Linkages

The role of hydrogen bonding on tuning hard-soft segments in bio-based thermoplastic poly(ether-urethane)s

2020 ◽  
Vol 274 ◽  
pp. 122678
Author(s):  
Paulina Kasprzyk ◽  
Hynek Benes ◽  
Ricardo Keitel Donato ◽  
Janusz Datta
Keyword(s):  
Hydrogen Bonding ◽  
Soft Segments

scholarly journals Side-Chain to Main-Chain Hydrogen Bonding Controls the Intrinsic Backbone Dynamics of the Amyloid Precursor Protein Transmembrane Helix

2014 ◽  
Vol 106 (6) ◽  
pp. 1318-1326 ◽  
Author(s):  
Christina Scharnagl ◽  
Oxana Pester ◽  
Philipp Hornburg ◽  
Daniel Hornburg ◽  
Alexander Götz ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Amyloid Precursor Protein ◽  
Main Chain ◽  
Transmembrane Helix ◽  
Precursor Protein ◽  
Backbone Dynamics ◽  
Side Chain
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