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Literature summary for 6.1.1.15 extracted from

  • Burke, B.; Lipman, R.S.A.; Shiba, K.; Musier-Forsyth, K.; Hou, Y.M.
    Divergent adaptation of tRNA recognition by Methanococcus jannaschii prolyl-tRNA synthetase (2001), J. Biol. Chem., 276, 20286-20291.
    View publication on PubMed

Cloned(Commentary)

Cloned (Comment) Organism
expression of the His-tagged enzyme in Escherichia coli BL21(DE3) Methanocaldococcus jannaschii

Organism

Organism UniProt Comment Textmining
Methanocaldococcus jannaschii Q58635
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Methanocaldococcus jannaschii DSM 2661 Q58635
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Purification (Commentary)

Purification (Comment) Organism
recombinant enzyme from Escherichia coli Methanocaldococcus jannaschii

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
ATP + L-proline + tRNAPro mutations are introduced into the acceptor stem and the anticodon. Variants containing a single substitution of C72 or A73, or of one of the anticodon nucleotides, are created by site-directed mutagenesis. Substitution of A73 in Methanococcus jannaschii tRNAPro by any of the other three nucleotides has a small effect (about 10fold) on kcat/Km. The G73 substitution has the most severe effect (12.2fold), whereas the C73 or U73 substitution has a smaller effect (2-fold and 6-fold, respectively). A73 is much less significant for Methanococcus jannaschii tRNA recognition than it is for the Escherichia coli tRNA. The weak contribution of A73 to recognition by Methanococcus jannaschii ProRS, however, is comparable with that of C73 in the human system. Position 72 of Methanococcus jannaschii tRNAPro also has a minor role in aminoacylation. Substitution with any other nucleotide has a less than 10fold effect on kcat/Km. The U substitution results in the largest decrease (5.3fold), followed by the G substitution (2.2fold). The A substitution is well tolerated with only a 1.4fold decrease in kcat/Km. Substitution of U34 with A or G has no effect on aminoacylation, whereas substitution with C results in only a 1.3fold decrease. The anticodon nucleotide G35 of tRNAPro is a minor determinant for aminoacylation. Substitution of G35 with A has the largest effect (9fold), followed by the C substitution (8fold), and the U substitution (1.5fold). The most important specificity determinant in Methanococcus jannaschii tRNAPro is G36. Substitution with C alone reduces the kcat/Km of aminoacylation by 250fold, and substitution with A results in a nearly 40fold decrease. The exception is the U substitution, which maintains a kcat/Km that is similar to that of the wild-type tRNA. A representative aminoacylation assay of the C36, A36, and U36 mutants relative to that of the wild-type is shown Methanocaldococcus jannaschii AMP + diphosphate + L-prolyl-tRNAPro
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ATP + L-proline + tRNAPro mutations are introduced into the acceptor stem and the anticodon. Variants containing a single substitution of C72 or A73, or of one of the anticodon nucleotides, are created by site-directed mutagenesis. Substitution of A73 in Methanococcus jannaschii tRNAPro by any of the other three nucleotides has a small effect (about 10fold) on kcat/Km. The G73 substitution has the most severe effect (12.2fold), whereas the C73 or U73 substitution has a smaller effect (2-fold and 6-fold, respectively). A73 is much less significant for Methanococcus jannaschii tRNA recognition than it is for the Escherichia coli tRNA. The weak contribution of A73 to recognition by Methanococcus jannaschii ProRS, however, is comparable with that of C73 in the human system. Position 72 of Methanococcus jannaschii tRNAPro also has a minor role in aminoacylation. Substitution with any other nucleotide has a less than 10fold effect on kcat/Km. The U substitution results in the largest decrease (5.3fold), followed by the G substitution (2.2fold). The A substitution is well tolerated with only a 1.4fold decrease in kcat/Km. Substitution of U34 with A or G has no effect on aminoacylation, whereas substitution with C results in only a 1.3fold decrease. The anticodon nucleotide G35 of tRNAPro is a minor determinant for aminoacylation. Substitution of G35 with A has the largest effect (9fold), followed by the C substitution (8fold), and the U substitution (1.5fold). The most important specificity determinant in Methanococcus jannaschii tRNAPro is G36. Substitution with C alone reduces the kcat/Km of aminoacylation by 250fold, and substitution with A results in a nearly 40fold decrease. The exception is the U substitution, which maintains a kcat/Km that is similar to that of the wild-type tRNA. A representative aminoacylation assay of the C36, A36, and U36 mutants relative to that of the wild-type is shown Methanocaldococcus jannaschii DSM 2661 AMP + diphosphate + L-prolyl-tRNAPro
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Synonyms

Synonyms Comment Organism
ProRS
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Methanocaldococcus jannaschii