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Concentration-dependent antagonistic persuasion of SDS and naphthalene derivatives on the fibrillation of stem bromelain

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Title Concentration-dependent antagonistic persuasion of SDS and naphthalene derivatives on the fibrillation of stem bromelain
 
Creator QADEER, A
AHMAD, E
ZAMAN, M
KHAN, MW
KHAN, JM
RABBANI, G
TARIQUE, KF
SHARMA, G
GOURINATH, S
NADEEM, S
BADR, G
KHAN, RH
 
Subject Amyloid inhibition
ANS
Bis-ANS
SDS
Stem bromelain
pi-pi Interactions
AMYLOID FIBRILS
ALPHA-LACTALBUMIN
AGGREGATION
BINDING
THERMODYNAMICS
FLUORESCENCE
DISEASE
STATE
ANS
BIOCHEMISTRY
 
Description Sodium dodecyl sulfate, a biological membrane mimetic, can be used to study the conversion of globular proteins into amyloid fibrils in vitro. Using multiple approaches, the effect of SDS was examined on stem bromelain (SB), a widely recognized therapeutic protein. SB is known to exist as a partially folded intermediate at pH 2.0, situation also encountered in the gastrointestinal tract (its site of absorption). In the presence of sub-micellar SDS concentration (500-1000 mu M), this intermediate was found to exhibit great propensity to form large-sized beta-sheeted aggregates with fibrillar morphology, the hall marks of amyloid structure. We also observed inhibition of fibrillation by two naphthalene-based compounds, ANS and bis-ANS. While bis-ANS significantly inhibited fibril formation at 50 mu M, ANS did so at relatively higher concentration (400 mu M). Alcohols, but not salts, were found to weaken the inhibitory action of these compounds suggesting the possible involvement of hydrophobic interactions in their binding to protein. Besides, isothermal titration calorimetry and molecular docking studies suggested that inhibition of fibrillation by these naphthalene derivatives is mediated not just through hydrophobic forces, but also by disruption of pi-pi interactions between the aromatic residues together with the inter-polypeptide chain repulsion among negatively charged ANS/bis-ANS bound SB. (C) 2013 Elsevier Inc. All rights reserved.
 
Publisher ELSEVIER SCIENCE INC
 
Date 2014-10-15T12:33:37Z
2014-10-15T12:33:37Z
2013
 
Type Article
 
Identifier ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS, 540(1-2)101-116
0003-9861
1096-0384
http://dx.doi.org/10.1016/j.abb.2013.10.015
http://dspace.library.iitb.ac.in/jspui/handle/100/14915
 
Language en