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Ilam University of Medical Sciences

Domain analysis of human apotransferrin upon interaction with sodium n-dodecyl sulphate: Differential scanning calorimetry and circular dichroism approaches

Thu Oct 6 08:12:01 2022

(2003) Domain analysis of human apotransferrin upon interaction with sodium n-dodecyl sulphate: Differential scanning calorimetry and circular dichroism approaches. Thermochimica Acta. pp. 9-16. ISSN 00406031 (ISSN)

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Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2....

Abstract

The domain analysis of human apotransferrin (apo hTF) upon interaction with sodium n-dodecyl sulphate (SDS) was studied by differential scanning calorimetry (DSC) and circular dichroism (CD) using Hepes buffer, 100 mM, at pH = 7. The DSC profile for apo hTF depicts two distinct peaks, while when interacted with SDS, the DSC peaks are shifted to the left as well as the area under the peaks are reduced. The DSC profile without the presence of SDS has two dissimilar peaks including two melting points (Tm = 60 °C, Tm = 70 °C). This profile in the presence of low concentrations of SDS shows two nearly similar peaks and decrement of Tm values about 5 °C relative to profile in the absence of SDS. The DSC excess heat capacity was deconvoluted for apo hTF in the presence of SDS. The interaction of SDS with apo hTF induced two dissimilar subdomains for each domain, but each domain having two subdomains similar to each other. The CD experiment of apo hTF-SDS complexes shows the decrement of α-helix content and the increment of β-sheet structure relative to protein in the absence of SDS. The α-helix tendency calculation shows more α-helix content for N domain relative to C domain. Here SDS at low concentration plays a role as a good probe to define the electrostatic moiety for N domain relative to C domain that is initiated from dissimilarity of α-helicity of two domains. © 2003 Elsevier B.V. All rights reserved.

Item Type: Article
Creators:
CreatorsEmail
Rezaei-Tavirani, M.UNSPECIFIED
Moosavi-Movahedi, A. A.UNSPECIFIED
Moosavi-Nejad, S. Z.UNSPECIFIED
Chamani, J.UNSPECIFIED
Ajloo, D.UNSPECIFIED
Keywords: Differential scanning calorimetry Domain analysis Electrostatic interaction Human apotransferrin Sodium dodecyl sulphate apotransferrin buffer dodecyl sulfate sodium alpha helix amino terminal sequence article beta sheet calculation carboxy terminal sequence circular dichroism complex formation concentration response electricity human melting point molecular probe pH protein analysis protein domain protein interaction
Divisions:
Page Range: pp. 9-16
Journal or Publication Title: Thermochimica Acta
Journal Index: Scopus
Volume: 408
Number: 1-2
Identification Number: https://doi.org/10.1016/S0040-6031(03)00311-3
ISSN: 00406031 (ISSN)
Depositing User: مهندس مهدی شریفی
URI: http://eprints.medilam.ac.ir/id/eprint/1694

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