title: Spectroscopic characterization of gelonin--assignments secondary structure and thermal denaturation.
abstract: Gelonin, a type 1 ribosome inactivating protein (RIP), having only one polypeptide chain, and which could be used against deadly diseases like cancer and AIDS is investigated spectroscopically through infrared (IR), diffused reflectance infrared fourier transform (DRIFT) and Raman techniques and observed vibrational modes are assigned. It is found that gelonin is having mainly alpha-helix and beta-sheet structure with some turn and disordered structure, the estimated percentage structure using Raman data being approximately 32% alpha-helix, approximately 20% beta-sheet, approximately 26% turn and approximately 22% disorder type. The temperature dependent infrared study of gelonin reveals its thermal stability, the denaturation temperature being around 60 degrees C and disordered contribution increasing with heating.
authors.affiliation: Institute of Self Organising Systems & Biophysics, Shillong, India.
authors.forename: B
authors.initials: B
authors.lastname: Pal
authors.forename: P K
authors.initials: PK
authors.lastname: Bajpai
mesh_terms: D010940:Plant Proteins / Q000737:chemistry*; D011489:Protein Denaturation; D017433:Protein Structure, Secondary; D054789:Ribosome Inactivating Proteins, Type 1; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013696:Temperature
chemical_list: D010940:Plant Proteins; D054789:Ribosome Inactivating Proteins, Type 1; C025674:GEL protein, Gelonium multiflorum