title: An insight into the biophysical characterization of insoluble collagen aggregates: implication for arthritis.
abstract: Misfolding and aggregation of proteins is involved in some of the most prevalent neurodegenerative disorders. The importance of collagen stems from the fact that it is one of the dominant component used for tissue engineering and drug delivery applications and is a major component of skin, tendon, bone and other connective tissues. A systematic investigation on the conformation of collagen at various concentrations of glyoxal is studied by various biophysical techniques such as Trp fluorescence, ANS binding, Circular dichroism (CD), ATR-FTIR, Congo red (CR) assay, Rayleigh light scattering and Turbidity measurements. At 60% (v/v) glyoxal, collagen retains native-like secondary structure, altered Trp environment and high ANS fluorescence, characteristic of molten globule (MG) state. At 80% (v/v) glyoxal, insoluble collagen aggregates are detected as confirmed by decrease in Trp and ANS fluorescence, increase in non-native β sheet structure as evident from far-UV CD and FTIR spectra, increase in Thioflavin T fluorescence, Rayleigh light scattering, Turbidity measurements, as well as red shift in CR absorbance.
authors.affiliation: Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, 202002, India.
authors.forename: Samreen
authors.initials: S
authors.lastname: Amani
authors.forename: Anas
authors.initials: A
authors.lastname: Shamsi
authors.forename: Gulam
authors.initials: G
authors.lastname: Rabbani
authors.forename: Aabgeena
authors.initials: A
authors.lastname: Naim
mesh_terms: D001168:Arthritis; D003094:Collagen / Q000737:chemistry*; D006037:Glyoxal / Q000737:chemistry; D006801:Humans; D011487:Protein Conformation
chemical_list: D006037:Glyoxal; D003094:Collagen