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Ajamaluddin Malik

Associate Professor

Associate Professor

كلية العلوم
Building no 5, room no 2A56
المنشورات
مقال فى مجلة
2017

Spectral and thermal properties of novel eye lens ζ-crystallin

, Ajamaluddin Malik, Shurog Albogami, Abdulrahman M. Al-Senaidy, Abeer M. Aldbass, Mohammad A. Alsenaidy, Shams Khan. . 2017

Eye lenses are exposed to thermal, solar radiations, dryness that enhances cataractogenesis. Some animal lenses contain novel proteins in bulk quantities. ζ-crystallin occurred in three ecologically divergent species, but it's physiological role not known. The truncated variant of ζ-crystallin causes hereditary cataract. Guinea pig ζ-crystallin is temperature-sensitive and rapidly aggregates at 41°C. Camels adopted to survive above 50°C, which raises an interesting question about how it retains lens proteins in the soluble state? Here, we have optimized expression and purification of recombinant camel ζ-crystallin. We have studied thermodynamic and spectroscopic properties using orthogonal techniques. Dynamic multimode spectroscopy results showed that camel ζ-crystallin unfolds via single transition with Tm value of 60.8±0.1°C and van't Hoff enthalpy of 714.7±7.1kJ/mol. Thermal-shift assay calculates Tm value of 62°C at pH 7. Additionally, the conformational stability of ζ-crystallin increases with ionic-strength. The influence of pH on ζ-crystallin was evaluated where the protein was found to be stable in the pH range of 6-9, but its stability drastically decreases below pH 6. Our results also showed that quaternary structure of ζ-crystallin drastically changed as a result of lowering pH. This study provides significant understandings onto the conformational, thermodynamic and unfolding pathway of camel ζ-crystallin.

رقم المجلد
102
مجلة/صحيفة
International Journal of Biological Macromolecules
الصفحات
1052–1058
مزيد من المنشورات
publications

Polyphosphate polymers are chains of phosphate monomers chemically
bonded together via phosphoanhydride bonds. They are found in all prokaryotic and
eukaryotic organisms and are among…

بواسطة Ajamaluddin Malik, Javed Masood Khan, Abdulaziz M. Al-Amri, Nojood Altwaijry, Prerna Sharma, Abdullah Alhomida, Priyankar Sen
publications

Phosphate additions in processed foods are a health risk that has been overlooked. This study examined the
effects of a permitted food additive (E452; Sodium Hexametaphosphate (SHMP)) on…

بواسطة Ajamaluddin Malik, Javed Masood Khan, Abdulaziz M. Al-Amri, Nojood Altwaijry, Abdullah S Alhomida, Mohammad Shamsul Ola
2023
publications

Protein aggregation is implicated in different human diseases. It also makes the protein less desirable candidate for industry as they exhibit reduced biological activity. Proteins tend to…

بواسطة Javed Masood Khan, Ajamaluddin Malik, Abdulaziz M. Al-Amri.
2023
تم النشر فى:
Journal of Molecular Liquids