Structure and function of a novel cold regulated cold shock domain containing protein from an obligate psychrophilic yeast, Glaciozyma antarctica

• Main Authors: Jennifer Charles, Makdi Masnoddin, Farhan Nazaie, Nur Athirah Yusof
• Format: Article
• Language: English; English
• Published: Advances in Polar Science 2020
• Subjects: QK Botany; S Agriculture (General)
• Online Access: https://eprints.ums.edu.my/id/eprint/27494/1/Structure%20and%20function%20of%20a%20novel%20cold%20regulated%20cold%20shock%20domain%20containing%20protein%20from%20an%20obligate%20psychrophilic%20yeast%2C%20Glaciozyma%20antarctica-Abstract.pdf; https://eprints.ums.edu.my/id/eprint/27494/2/Structure%20and%20function%20of%20a%20novel%20cold%20regulated%20cold%20shock%20domain%20containing%20protein%20from%20an%20obligate%20psychrophilic%20yeast%2C%20Glaciozyma%20antarctica.pdf; https://eprints.ums.edu.my/id/eprint/27494/; http://www.aps-polar.org/paper/2020/31/02/A200512000004
• Institution: Universiti Malaysia Sabah

Cold shock domain (CSD)-containing proteins are one of the groups of the evolutionarily conserved nucleic acid-binding proteins in all three domains of life consisting of an ancient beta-barrel fold that serves to bind nucleic acids. The cDNA of a novel protein-coding gene containing CSD was cloned from Glaciozyma antarctica designated as Ga16676. The full length of Ga16676 gene with the size of 1335 bp encodes for an N-terminal CSD with conserved nucleic acids binding motif RNP1 and RNP2. The Ga16676 gene was cloned in pET30 Ek/LIC, sequenced, expressed and its resistance towards cold was characterized. Recombinant protein expression of Ga16676 showed over expressed soluble expression in both supernatant and pellet forms at 20 . The effects of recombinant CSD ℃ protein overexpression on colony formation shows that E. coli cells were able to grow at 37 and 20 but not at 4 while ℃℃ ℃ E. coli_Ga16676 cells were able to grow at all temperatures tested. In addition, E. coli_Ga16676 cells showed higher growth rate compared to empty E. coli cells at 10 . Structural analysis of ℃ Ga16676 reveals some interesting findings such as more aromatic interactions for efficient binding in low energy environment, a longer loop that may contribute to structural flexibility and clustering of charged amino acids on the protein surface that is important for protein stability and flexibility.