摘要:
A non-natural protein having at least one ester bond in its polypeptide main chain is synthesized by using an in vivo translation system in a ribosome. The following components (a) to (c) are expressed in a cell or an cell extraction solution in the presence of an α-hydroxy acid: (a) an aminoacyl-tRNA synthetase which can activate the α-hydroxy acid; (b) suppressor tRNA which can bind to the α-hydroxy acid in the presence of the aminoacyl-tRNA synthetase; and (c) a gene encoding a desired protein having a nonsense mutation or a frame-shift mutation at a desired site.
摘要:
A non-natural protein having at least one ester bond in its polypeptide main chain is synthesized by using an in vivo translation system in a ribosome. The following components (a) to (c) are expressed in a cell or an cell extraction solution in the presence of an α-hydroxy acid: (a) an aminoacyl-tRNA synthetase which can activate the α-hydroxy acid; (b) suppressor tRNA which can bind to the α-hydroxy acid in the presence of the aminoacyl-tRNA synthetase; and (c) a gene encoding a desired protein having a nonsense mutation or a frame-shift mutation at a desired site.
摘要:
The present invention relates to a process for producing a protein having an unnatural amino acid introduced therein, the process including: expressing in a eukaryotic cell an aminoacyl-tRNA synthetase, a nucleic acid having a sequence containing a eukaryote-derived tRNA nucleotide sequence linked to the 5′ end of a tRNA nucleotide sequence that is ligated with to an unnatural amino acid in the presence of the aminoacyl-tRNA synthetase, an unnatural amino acid, and a gene of a desired protein having a nonsense mutation at a predetermined position, to integrate the unnatural amino acid at the nonsense mutation position into the protein, thereby expressing a protein having an unnatural amino acid introduced therein.
摘要:
Method for incorporating a lysine derivative (particularly an Nε-benzyloxycarbonyl-lysine (Z-Lys) derivative) having useful functional group such as heavy atom, selenium, reactive functional group, fluorescent group or crosslinker, which is suitable as a non-natural amino acid, into a desired protein in a site-specific manner. A mutant pyrrolysyl-tRNA synthetase has substitution of at least one amino acid residue selected from tyrosine residue at position 306, leucine residue at position 309 and cysteine residue at position 348 each constituting a pyrrolysine-binding site in the amino acid sequence for pyrrolysyl-tRNA synthetase of SEQ ID NO:2. The substitution of the amino acid residue is: of tyrosine residue at position 306 by glycine or alanine residue, of leucine residue at position 309 by glycine or alanine residue, and/or of a cysteine residue at position 348 by valine, serine or alanine residue.
摘要翻译:引入适合作为非天然的有重要原子,硒,反应性官能团,荧光基团或交联剂等有用官能团的赖氨酸衍生物(特别是N,N-苄氧羰基赖氨酸(Z-Lys)衍生物)的方法 氨基酸,以位点特异性方式转化成所需的蛋白质。 突变型吡咯赖氨酰-tRNA合成酶具有至少一个氨基酸残基的取代,该氨基酸残基选自306位的酪氨酸残基,309位的亮氨酸残基和348位的半胱氨酸残基,每个构成吡咯赖氨酰-tRNA的氨基酸序列中的吡咯赖氨酸结合位点 SEQ ID NO:2的合成酶。 氨基酸残基的取代是:位置306处的甘氨酸或丙氨酸残基的酪氨酸残基,309位的亮氨酸残基被甘氨酸或丙氨酸残基取代,和/或348位的半胱氨酸残基被缬氨酸,丝氨酸或丙氨酸残基取代 。
摘要:
To safely and quickly exchange a seal of a shock strut of a selected shock absorbing apparatus of an airplane, an apparatus is provided whereby the main body of the airplane is lifted by pressurizing and extending at least one other shock absorbing apparatus in order to extend the selected shock absorbing apparatus and expose the seal thereof. A shock strut of the selected shock absorbing apparatus is then lifted away from the associated wheels so that a new seal may be inserted from below the strut.
摘要:
To safely and quickly exchange a seal of a shock strut of a selected shock absorbing apparatus of an airplane, an apparatus is provided whereby the main body of the airplane is lifted by pressurizing and extending at least one other shock absorbing apparatus in order to extend the selected shock absorbing apparatus and expose the seal thereof. A shock strut of the selected shock absorbing apparatus is then lifted away from the associated wheels so that a new seal may be inserted from below the strut. To lift the strut, an apparatus is provided which includes a main body portion having an inclined surface substantially complementary to a downward-facing inclined surface of the strut, and a cylindrical portion which inserts into an attachment hole of the strut.
摘要:
To safety and quickly exchange a seal of a shock strut of a selected shock absorbing apparatus of an airplane, the main body of the airplane is lifted by pressurizing and extending at least one other shock absorbing apparatus in order to extend the selected shock absorbing apparatus and expose the seal thereof. A shock strut of the selected shock absorbing apparatus is then lifted away from the associated wheels so that a new seal may be inserted from below the strut.