Reaction equation
N[C@H](C(O)=O)CS.C1(=O)NC(=O)C=C1.[OH:15][C:16]([CH2:18][CH2:19][CH2:20][CH2:21][C@H:22]1[C@@H:30]2[C@@H:25]([NH:26][C:27]([NH:29]2)=[O:28])[CH2:24][S:23]1)=[O:17]>>[OH:17][C:16]([CH2:18][CH2:19][CH2:20][CH2:21][C@H:22]1[C@@H:30]2[C@@H:25]([NH:26][C:27]([NH:29]2)=[O:28])[CH2:24][S:23]1)=[O:15]Participants
Procedure
The term “thiol reactivity value” is a quantitative characterization of the reactivity of free cysteine amino acids. The thiol reactivity value is the percentage of a free cysteine amino acid in a cysteine engineered antibody which reacts with a thiol-reactive reagent, and converted to a maximum value of 1. For example, a free cysteine amino acid on a cysteine engineered antibody which reacts in 100% yield with a thiol-reactive reagent, such as a biotin-maleimide reagent, to form a biotin-labelled antibody has a thiol reactivity value of 1.0. Another cysteine amino acid engineered into the same or different parent antibody which reacts in 80% yield with a thiol-reactive reagent has a thiol reactivity value of 0.8. Another cysteine amino acid engineered into the same or different parent antibody which fails totally to react with a thiol-reactive reagent has a thiol reactivity value of 0. Determination of the thiol reactivity value of a particular cysteine may be conducted by ELISA assay, mass spectroscopy, liquid chromatography, autoradiography, or other quantitative analytical tests.
Sources & evidence
- ORD record
- ord-432b16142992436996c9183650f93bd3
- Source dataset
- uspto-grants-2014_05
- Patent number
- US08722857B2
Linked notes
Loading…