Zagazig University Digital Repository
Home
Thesis & Publications
All Contents
Publications
Thesis
Graduation Projects
Research Area
Research Area Reports
Search by Research Area
Universities Thesis
ACADEMIC Links
ACADEMIC RESEARCH
Zagazig University Authors
Africa Research Statistics
Google Scholar
Research Gate
Researcher ID
CrossRef
Study of conformational changes of ewe's holo (native) and apo-alpha-lactalbumin by spectroscopy and trypsinolysis
Faculty
Agriculture
Year:
2006
Type of Publication:
Article
Pages:
390-404
Authors:
Sitohy, Mahmoud, Chobert, Jean-Marc, Haertle, Thomas, Choiset, Yvan, Dalgalarrondo, Michele, El-Zahar, Khaled
DOI:
10.1111/j.1745-4514.2006.00072.x
Journal:
JOURNAL OF FOOD BIOCHEMISTRY BLACKWELL PUBLISHING
Volume:
30
Research Area:
Biochemistry \& Molecular Biology; Food Science \& Technology
ISSN
ISI:000239117300002
Keywords :
Study , conformational changes , ewe's holo (native)
Abstract:
Conformational changes of ewe's alpha-lactalbumin (ALA) upon removal of Ca2+ were determined by surface hydrophobicity, calorimetry and circular dichroism. Native ewe's ALA resisted trypsinolysis, showing 4\% maximum degradation after 20 h of hydrolysis. Removal of bound calcium by addition of either ethylenediaminetetraacetic acid or ethylene glycol bis beta-aminoethyl ether-N,N,N,N-tetraacetic acid induced major protein conformational changes, enhancing its susceptibility to trypsinolysis, and leading to complete degradation of the protein. Reversed-phase high-performance liquid chromatography profiles of tryptic hydrolysate of Ca2+-free ALA were nearly the same through the whole enzymatic incubation period (24 h) showing the absence of sequential hydrolytic mechanism. They were characterized by the presence of five main peaks representing hydrophobic large-sized peptides. Cleaving the S-S bonds in the resulting hydrolysates with 2-mercaptoethanol gave rise to new peaks representing more hydrophilic and hydrophobic peptides.
Online
PDF
جامعة المنصورة
جامعة الاسكندرية
جامعة القاهرة
جامعة سوهاج
جامعة الفيوم
جامعة بنها
جامعة دمياط
جامعة بورسعيد
جامعة حلوان
جامعة السويس
شراقوة
جامعة المنيا
جامعة دمنهور
جامعة المنوفية
جامعة أسوان
جامعة جنوب الوادى
جامعة قناة السويس
جامعة عين شمس
جامعة أسيوط
جامعة كفر الشيخ
جامعة السادات
جامعة طنطا
جامعة بنى سويف