摘要:
Compositions and methods are provided for enzymes with altered properties that involve a systematic approach to mutagenesis and a screening assay that permits selection of the desired proteins. Embodiments of the method are particularly suited for modifying specific properties of restriction endonucleases such as star activity. The compositions include restriction endonucleases with reduced star activity as defined by an overall fidelity index improvement factor.
摘要:
Compositions and methods are provided for enzymes with altered properties that involve a systematic approach to mutagenesis and a screening assay that permits selection of the desired proteins. Embodiments of the method are particularly suited for modifying specific properties of restriction endonucleases such as star activity. The compositions include restriction endonucleases with reduced star activity as defined by an overall fidelity index improvement factor.
摘要:
Methods and compositions are provided for engineering mutant enzymes with reduced star activity where the mutant enzymes have a fidelity index (FI) in a specified buffer that is greater than the FI of the non-mutated enzyme in the same buffer.
摘要:
Methods and compositions are provided for engineering mutant enzymes with reduced star activity where the mutant enzymes have a fidelity index (FI) in a specified buffer that is greater than the FI of the non-mutated enzyme in the same buffer.
摘要:
A nicking endonuclease is described which has an amino acid sequence with at least 70% identity to SEQ ID NO:6 and comprising a mutation at least one of an arginine or gutamic acid corresponding to position 507 and position 546 respectively in SEQ ID NO:6.
摘要翻译:描述了一种切口内切核酸酶,其具有与SEQ ID NO:6具有至少70%同一性的氨基酸序列,并且包含分别对应于SEQ ID NO:6中的位置507和位置546的精氨酸或谷氨酸中的至少一种的突变 。
摘要:
Recombinant DNA encoding NruI- and SboI-like restriction endonucleases and methylases and their amino acid sequences are provided as well as methods for expressing the enzymes in transformed host cells and purifying the enzymes.
摘要:
A nicking endonuclease is described which has an amino acid sequence with at least 70% identity to SEQ ID NO:6 and comprising a mutation at least one of an arginine or glutamic acid corresponding to position 507 and position 546 respectively in SEQ ID NO:6.
摘要翻译:描述了一种切口内切核酸酶,其具有与SEQ ID NO:6具有至少70%同一性的氨基酸序列,并且包含分别对应于SEQ ID NO:6中的位置507和位置546的精氨酸或谷氨酸中的至少一种的突变 。
摘要:
Recombinant DNA encoding NruI- and SboI-like restriction endonucleases and methylases and their amino acid sequences are provided as well as methods for expressing the enzymes in transformed host cells and purifying the enzymes.
摘要:
The present invention relates to recombinant DNA which encodes the BsaI restriction endonuclease as well as BsaI methylase, expression of BsaI restriction endonuclease and BsaI methylase in E. coli cells containing the recombinant DNA, and purification of BsaI restriction endonuclease to near homogeneity.
摘要:
The present invention relates to compositions including: (1) isolated DNA encoding the StuI restriction endonuclease and isolated DNA encoding cognate and non-cognate methylase; (2) vectors and cells containing the isolated DNA; and (3) methods for producing the StuI restriction endonuclease.