Surface active benzodiazepine-bromo-alkyl conjugate for potential GABAA-receptor purification

2011 ◽  
Vol 9 (16) ◽  
pp. 5737
Author(s):  
A. V. Turina ◽  
G. J. Quinteros ◽  
B. Caruso ◽  
E. L. Moyano ◽  
M. A. Perillo
Keyword(s):  
Gabaa Receptor ◽  
Receptor Purification ◽  
Surface Active

A Surface Active Benzodiazepine Receptor Ligand for Potential Probing Membrane Order of GABAA-Receptor Surroundings

2008 ◽  
Vol 19 (9) ◽  
pp. 1888-1895 ◽  
Author(s):  
Anahí V. Turina ◽  
Benjamín Caruso ◽  
Gloria I. Yranzo ◽  
Elizabeth L. Moyano ◽  
María A. Perillo
Keyword(s):  
Gabaa Receptor ◽  
Benzodiazepine Receptor ◽  
Receptor Ligand ◽  
Membrane Order ◽  
Surface Active

Morphological behavior of compatibilized ternary blends prepared by mechanical mixing

1993 ◽  
Vol 51 ◽  
pp. 1200-1201
Author(s):  
S.D. Smith ◽  
R.J. Spontak ◽  
D.H. Melik ◽  
S.M. Buehler ◽  
K.M. Kerr ◽  
...  
Keyword(s):  
Interfacial Adhesion ◽  
Diblock Copolymers ◽  
Ternary Blends ◽  
Mechanical Mixing ◽  
Design Considerations ◽  
Covalently Bonded ◽  
Homopolymer Blends ◽  
Emulsifying Agent ◽  
Surface Active ◽  
Low Entropy

When blended together, homopolymers A and B will normally macrophase-separate into relatively large (≫1 μm) A-rich and B-rich phases, between which exists poor interfacial adhesion, due to a low entropy of mixing. The size scale of phase separation in such a blend can be reduced, and the extent of interfacial A-B contact and entanglement enhanced, via addition of an emulsifying agent such as an AB diblock copolymer. Diblock copolymers consist of a long sequence of A monomers covalently bonded to a long sequence of B monomers. These materials are surface-active and decrease interfacial tension between immiscible phases much in the same way as do small-molecule surfactants. Previous studies have clearly demonstrated the utility of block copolymers in compatibilizing homopolymer blends and enhancing blend properties such as fracture toughness. It is now recognized that optimization of emulsified ternary blends relies upon design considerations such as sufficient block penetration into a macrophase (to avoid block slip) and prevention of a copolymer multilayer at the A-B interface (to avoid intralayer failure).

259: Melatonin Enlarges the Bladder by the Gabaa Receptor in the Brain, Suggesting its Efficaciousness Against Nocturia

2007 ◽  
Vol 177 (4S) ◽  
pp. 86-87
Author(s):  
Yosuke Matsuta ◽  
Aniwar Yusup ◽  
Masaharu Nakai ◽  
Kazuya Tanase ◽  
Yoshitaka Aoki ◽  
...  
Keyword(s):  
Gabaa Receptor ◽  
The Brain

Cinnamamides from Piper capense with affinity to the benzodiazepine site on the GABAA receptor

Planta Medica ◽  
2008 ◽  
Vol 74 (09) ◽  
Author(s):  
ME Pedersen ◽  
HB Rasmussen ◽  
B Metzler ◽  
GI Stafford ◽  
J van Staden ◽  
...  
Keyword(s):  
Gabaa Receptor ◽  
Benzodiazepine Site

Bioactivity-guided Isolation of GABAA Receptor Modulating Constituents from the Rhizome of Actaea racemosa

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
SS Cicek ◽  
S Khom ◽  
B Taferner ◽  
S Hering ◽  
H Stuppner
Keyword(s):  
Gabaa Receptor ◽  
Actaea Racemosa

Isoflavonoid derivatives from Adenocarpus cincinnatus as positive GABAA receptor modulators

Planta Medica ◽  
2013 ◽  
Vol 79 (13) ◽  
Author(s):  
DC Rueda ◽  
M de Mieri ◽  
S Hering ◽  
M Hamburger
Keyword(s):  
Gabaa Receptor ◽  
Receptor Modulators

The Impact of Bioconjugation on the Interfacial Activity of a Protein Biosurfactant

2018 ◽  
Author(s):  
Hossam H Tayeb ◽  
Marina Stienecker ◽  
Anton Middelberg ◽  
Frank Sainsbury
Keyword(s):  
Polyethylene Glycol ◽  
Colloidal Stability ◽  
Point Mutations ◽  
Pharmaceutical Formulations ◽  
Industrial Processes ◽  
Parent Molecule ◽  
Site Specific ◽  
Interfacial Activity ◽  
Surface Active ◽  
The Impact

Biosurfactants, are surface active molecules that can be produced by renewable, industrially scalable biologic processes. DAMP4, a designer biosurfactant, enables the modification of interfaces via genetic or chemical fusion to functional moieties. However, bioconjugation of addressable amines introduces heterogeneity that limits the precision of functionalization as well as the resolution of interfacial characterization. Here we designed DAMP4 variants with cysteine point mutations to allow for site-specific bioconjugation. The DAMP4 variants were shown to retain the structural stability and interfacial activity characteristic of the parent molecule, while permitting efficient and specific conjugation of polyethylene glycol (PEG). PEGylation results in a considerable reduction on the interfacial activity of both single and double mutants. Comparison of conjugates with one or two conjugation sites shows that both the number of conjugates as well as the mass of conjugated material impacts the interfacial activity of DAMP4. As a result, the ability of DAMP4 variants with multiple PEG conjugates to impart colloidal stability on peptide-stabilized emulsions is reduced. We suggest that this is due to constraints on the structure of amphiphilic helices at the interface. Specific and efficient bioconjugation permits the exploration and investigation of the interfacial properties of designer protein biosurfactants with molecular precision. Our findings should therefore inform the design and modification of biosurfactants for their increasing use in industrial processes, and nutritional and pharmaceutical formulations.

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