Method for screening restriction endonucleases
    2.
    发明授权
    Method for screening restriction endonucleases 有权
    筛选限制性内切核酸酶的方法

    公开(公告)号:US06905837B2

    公开(公告)日:2005-06-14

    申请号:US10208557

    申请日:2002-07-30

    摘要: A method is provided for identifying a restriction endonuclease, which includes the steps of (a) screening a target DNA sequence for the presence of known methylase sequence motifs, (b) identifying any open reading frames which lie close to the methylase sequence motifs screened in step (a), and (c) assaying the protein products of these open reading frames for restriction endonuclease activity.Methods for identifying isoschizomers of known restriction endonucleases, which isoschizomers possess a desired physical property, such as thermostability, are also provided by the present invention, as are several novel restriction endonucleases isolated from M. jannaschii, MjaIII and MjaIV. Additionally, a gene was identified that encoded a previously observed endonuclease activity, designated MjaII.Also provided by the present invention are vectors suitable for cloning a DNA sequence encoding a cytotoxic protein, via independent transcription promotors which may be selectively controlled by several conditions. A method for producing these cytotoxic proteins using such vectors is also provided, as are stable clones of PacI and NlaIII.

    摘要翻译: 提供了用于鉴定限制性内切核酸酶的方法,其包括以下步骤:(a)筛选靶DNA序列以存在已知的甲基化酶序列基序,(b)鉴定位于接近甲基化酶序列基序的任何开放阅读框, 步骤(a)和(c)测定这些开放阅读框的蛋白质产物用于限制性内切核酸酶活性。 用于鉴定已知限制性内切核酸酶的异构体的方法,其中同分异构体具有期望的物理性质,例如热稳定性,也由本发明提供,以及分离自芒from嗪,MjaIII和MjaIV的几种新的限制性内切核酸酶。 此外,鉴定了编码先前观察到的内切核酸酶活性的基因,命名为MjaII。 本发明还提供了适合于通过独立转录启动子克隆编码细胞毒性蛋白质的DNA序列的载体,其可以通过几种条件选择性地控制。 还提供了使用这种载体产生这些细胞毒性蛋白质的方法,以及PacI和NlaIII的稳定克隆。

    Method for screening restriction endonucleases
    4.
    发明授权
    Method for screening restriction endonucleases 有权
    筛选限制性内切核酸酶的方法

    公开(公告)号:US06383770B1

    公开(公告)日:2002-05-07

    申请号:US09486356

    申请日:2000-02-25

    IPC分类号: C12Q144

    摘要: A method is provided for identifying a restriction endonuclease, which includes the steps of (a) screening a target DNA sequence for the presence of known methylase sequence motifs, (b) identifying any open reading frames which lie close to the methylase sequence motifs screened in step (a), and (c) assaying the protein products of these open reading frames for restriction endonuclease activity. Methods for identifying isoschizomers of known restriction endonucleases, which isoschizomers possess a desired physical property, such as thermostability, are also provided by the present invention, as are several novel restriction endonucleases isolated from M. jannaschii, MjaIII and MjaIV. Additionally, a gene was identified that encoded a previously observed endonuclease activity, designated MjaII. Also provided by the present invention are vectors suitable for cloning a DNA sequence encoding a cytotoxic protein, via independent transcription promotors which may be selectively controlled by several conditions. A method for producing these cytotoxic proteins using such vectors is also provided, as are stable clones of PacI and NlaIII.

    摘要翻译: 提供了用于鉴定限制性内切核酸酶的方法,其包括以下步骤:(a)筛选靶DNA序列以存在已知的甲基化酶序列基序,(b)鉴定位于接近甲基化酶序列基序的任何开放阅读框, 步骤(a)和(c)测定这些开放阅读框的蛋白质产物用于限制性内切核酸酶活性。 用于鉴定已知限制性内切核酸酶的异构体的方法,其中同分异构体具有期望的物理性质,例如热稳定性,也由本发明提供,以及从分枝杆菌,MjaIII和MjaIV分离的几种新的限制性内切核酸酶。 此外,鉴定了编码先前观察到的内切核酸酶活性的基因,命名为MjaII。 本发明还提供了适合于通过独立转录启动子克隆编码细胞毒性蛋白质的DNA序列的载体,其可以通过几种条件选择性地控制。 还提供了使用这种载体产生这些细胞毒性蛋白质的方法,以及PacI和NlaIII的稳定克隆。