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Arezou Ghahghaei,Majid Mohammadi Dareh mianeh 한국약제학회 2015 Journal of Pharmaceutical Investigation Vol.45 No.5
In vitro studies into proteins which are prone to form amyloid are very important. Today, researchers are trying to understand the exact mechanism of amyloid fibril formation because it causes many diseases. κ-Casein is a glycoprotein belonging to the family of milk phosphoprotein which plays an important role in the size, stability and performance of the casein micelles. This study investigates amyloid fibril formation by κ-casein and its prevention by β-casein in the presence and absence of crowding agent, dextran. Interaction between the chaperone and the κ-casein is investigated by thioflavin T fluorescence, intrinsic fluorescence intensity, ANS binding assay and CD spectroscopy. Fluorescence data show that dextran accelerated amyloid fibril formation of κ-casein. β-Casein acts as a molecular chaperone preventing the stress-induced amyloid formation of κ-casein. The effect of b-casein in preventing fibril formation of κ-casein in the presence of dextran was reduced, however, in the absence of dextran. This shows that dextran increases the rate of amyloid formation in κ-casein and causes some structural change in β-casein as assessed by CD spectroscopy. In summary, β-casein interacts with κ-casein and prevents amyloid formation but not as well as it does in the presence of the crowding agent, dextran.
Evaluation of chaperone ability of S. rosmarinus against protein aggregation
Abbas Heidari,Arezou Ghahghaei,Jafar Valizadeh 한국약제학회 2014 Journal of Pharmaceutical Investigation Vol.44 No.6
Protein aggregation occurs via a process inwhich unnatural molecules connect together and createsoluble small oligomers or insoluble aggregations. Theaggregation of protein depends on resistance conformationand the colloidal characteristics of proteins. Finding properways to stabilize or prevent of protein aggregation could beimportant for the control of such diseases as Alzheimer’sand Parkinson’s. Seidlitzia rosmarinus (S. rosmarinus)extract has antioxidant compounds which can cause anincrease in protein resistance and prevent protein aggregation. The aim of this study is to assess the chaperoneeffects of compounds in S. rosmarinus extract on proteinaggregation. In this research, the chaperone property of S. rosmarinus extract was evaluated on ovotransferin, insulin,and a-lactalbumin aggregation, using visible light spectroscopy,florescence and circular dichroism spectroscopy. The results indicate that the extract of S. rosmarinus couldprevent protein aggregation in a concentration-dependentmanner. The protective effect of S. rosmarinus, however,differed among the three proteins due to their differenthydrophobic surface areas.