2 research outputs found
A BODIPY-Tagged Phosphono Peptide as Activity-Based Probe for Human Leukocyte Elastase
Human leukocyte elastase
plays a crucial role in a variety of inflammatory
disorders and represents an important subject of biomedical studies.
The chemotype of peptidic phosphonates was employed for the design
of a new activity-based probe for human leukocyte elastase. Its structure
combines the phosphonate warhead with an adequate peptide portion
and a BODIPY fluorophore with a clickable ethinylphenyl moiety at <i>meso</i> position. The probe <b>6</b> was assembled by
copper-catalyzed alkyne–azide 1,3-dipolar cycloaddition. It
was characterized as an active site-directed elastase inhibitor exhibiting
a second-order rate constant of inactivation of 88400 M<sup>–1</sup>s<sup>–1</sup>. The suitability of <b>6</b> as a fluorescent
probe for human leukocyte elastase was demonstrated by in-gel fluorescence
analysis. Labeling experiments and inhibition data toward a panel
of related proteases underlined the selectivity of the probe for the
targeted leukocyte elastase
Design of an Activity-Based Probe for Human Neutrophil Elastase: Implementation of the Lossen Rearrangement To Induce Förster Resonance Energy Transfers
Human
neutrophil elastase is an important regulator of the immune
response and plays a role in host defense mechanisms and further physiological
processes. The uncontrolled activity of this serine protease may cause
severe tissue alterations and impair inflammatory states. The design
of an activity-based probe for human neutrophil elastase reported
herein relies on a sulfonyloxyphthalimide moiety as a new type of
warhead that is linker-connected to a coumarin fluorophore. The inhibitory
potency of the activity-based probe was assessed against several serine
and cysteine proteases, and the selectivity for human neutrophil elastase
(<i>K</i><sub>i</sub> = 6.85 nM) was determined. The adequate
fluorescent tag of the probe allowed for the in-gel fluorescence detection
of human neutrophil elastase in the low nanomolar range. The coumarin
moiety and the anthranilic acid function of the probe, produced in
the course of a Lossen rearrangement, were part of two different Förster
resonance energy transfers