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Arabidopsis amidase 1, a member of the amidase signature family.

FEBS J.2007 Jul;274(13):3440-51. Epub 2007 Jun 06
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摘要


Amidase 1 (AMI1), a specific indole-3-acetamide amidohydrolase, is an Arabidopsis thaliana amidase signature enzyme that catalyzes the synthesis of indole-3-acetic acid from indole-3-acetamide. Amidase signature family members catalyze a diverse range of enzymatic reactions and are found widespread in nature, for instance in bacteria, mammals, and plants. At the protein level, the family members share a conserved stretch of approximately 50-130 amino acids, the name-giving amidase signature. Elucidation of the crystal structures of a mammalian fatty acid amide hydrolase and the bacterial malonamidase E2 revealed an unusual Ser-cisSer-Lys catalytic triad in proteins of this family. In addition, other members, such as the amidase from Rhodococcus rhodochrous strain J1 or Sulfolobus solfataricus, seem to use an accessory Cys-cisSer-Lys center. AMI1 possesses all conserved amino-acid residues of the Ser-cisSer-Lys triad, but lacks the CX(3)C motif and therefore the Cys-cisSer-Lys catalytic site. Using a set of point-mutated variants of AMI1 and chemical modifications, we analyzed the relative importance of single amino-acid residues of AMI1 with respect to substrate conversion. These experiments revealed that a specific serine residue, Ser137, is essential for AMI1 enzymatic activity. We also report structural and functional differences of AMI1 from other amidase signature enzymes.

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