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논문 기본 정보

자료유형
학위논문
저자정보

이가혜 (부경대학교, 부경대학교 대학원)

지도교수
공인수
발행연도
2020
저작권
부경대학교 논문은 저작권에 의해 보호받습니다.

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이 논문의 연구 히스토리 (2)

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In aquatic environments with a neutral pH and low temperature, phytase used for decomposition of phytate should maintain high activity even at low temperatures. The N-terminal domain of the Pseudomonas sp. FB15 phytase which maintains high activity even at 25 °C increases low-temperature activity and catalytic efficiency. In this study, the three-dimensional structure of the N-terminal domain was predicted and substitutions for the amino acid residues of the region assumed to be the active site were made. The activity of mutants, in which alanine (A) was substituted for the original residue, was investigated at various temperatures and pH values. Significant differences in enzymatic activity were observed only in mutant E263A, suggesting that the amino acid residue at position 263 of the N-terminal domain is important in enzyme activity.

목차

1. Introduction 1
2. Materials and Methods 3
2.1. Three dimensional structural modeling 3
2.2. Bacterial strains, plasmids, media 3
2.3. Overlap PCR for site-directed mutagenesis 3
2.4. Overexpression and purification of recombinant proteins 4
2.5. Mutant phytases activity assay 4
2.6. Effects of temperature and pH on mutant phytase 4
3. Results 5
3.1. Three dimensional structural modeling 5
3.2. Site-directed mutagenesis and sequencing 5
3.3. Expression and purification of recombinant proteins 5
3.4. Effects of temperature and pH on mutant phytase 5
4. Discussion 7
5. References 16
Abstract (in Korean) 18
Acknowledgments 19

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