L-Leucine → 4-Nitroaniline
Reaction equation
N[C@H](C(O)=O)CC(C)C.[N+:10]([C:13]1[CH:19]=[CH:18][C:16]([NH2:17])=[CH:15][CH:14]=1)([O-:12])=[O:11].N[C@H](C(O)=O)CC(C)C>>[N+:10]([C:13]1[CH:19]=[CH:18][C:16]([NH2:17])=[CH:15][CH:14]=1)([O-:12])=[O:11]Participants
Procedure
A production strain of Aspergillus sojae (DS 8351) is cultured. Exopeptidase activity is expressed as Leucine aminopeptidase units (Leu-A): 1 Leu-A is the amount of enzyme needed to produce 1 μmol p-nitroaniline per minute at pH 7.2 and 20° C. from L-leucine-p-nitroaniline. The test is performed as follows: Leucine paranitroanilid (SIGMA) is dissolved in water at a concentration of 9 mM. 1 ml of the solution is mixed with 1.5 ml 0.1M phosphate buffer pH 7.2. At t=0, 0.5 ml enzyme is introduced and left for reaction at 20° C. Fifteen minutes later, 1 ml 1N HCl is added to stop the reaction. A blank is run with 1N HCl being introduced at t=0. Optical density is determined for the blank (ODblank) and for the assay (ODassay) at 400 nm. Activity is calculated as follows: A = ( OD blank - OD assay ) 9.8 × 15 × 4 0.5 Leu-A/ml
Sources & evidence
- ORD record
- ord-44252f8a95434a18afe3e2250ddb265f
- Source dataset
- uspto-grants-2002_03
- Patent number
- US06361808B1
Reaction notes
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