2′-Deoxyribosyltransferases Adaptation, Physiological Article Bacterial Proteins Catalytic Domain Chemical Phenomena Cold Temperature Crystal structure Disulfides Enzyme Activation Enzyme Stability Models, Molecular Pentosyltransferases Protein Conformation Protein Multimerization Psychrophilic enzymes Recombinant Proteins Spectrum Analysis Thermodynamics adaptation bacterial protein cell level chemical phenomena chemistry cold cold acclimatization crystal structure disulfide enzyme activation enzyme active site