6 research outputs found
Association of different characteristics during pregnancy with APOs: Results of univariate analysis.
<p>Association of different characteristics during pregnancy with APOs: Results of univariate analysis.</p
Demographic, laboratory, clinical manifestations of SLE pregnancies with or without preterm deliveries.
<p>Demographic, laboratory, clinical manifestations of SLE pregnancies with or without preterm deliveries.</p
Demographic, laboratory, clinical manifestations of SLE pregnancies with or without pregnancy loss.
<p>Demographic, laboratory, clinical manifestations of SLE pregnancies with or without pregnancy loss.</p
Comparison of adjusted fetal umbilical artery Doppler index between patients with and without APOs (meanĀ±SD).
<p>Comparison of adjusted fetal umbilical artery Doppler index between patients with and without APOs (meanĀ±SD).</p
Discovery and Mechanism Study of SIRT1 Activators that Promote the Deacetylation of Fluorophore-Labeled Substrate
SIRT1 is an NAD<sup>+</sup>-dependent deacetylase, whose
activators
have potential therapeutic applications in age-related diseases. Here
we report a new class of SIRT1 activators. The activation is dependent
on the fluorophore labeled to the substrate. To elucidate the activation
mechanism, we solved the crystal structure of SIRT3/ac-RHKK<sub>ac</sub>-AMC complex. The structure revealed that the fluorophore blocked
the H-bond formation and created a cavity between the substrate and
the Rossmann fold. We built the SIRT1/ac-RHKK<sub>ac</sub>-AMC complex
model based on the crystal structure. <i>K</i><sub>m</sub> and <i>K</i><sub>d</sub> determinations demonstrated that
the fluorophore decreased the peptide binding affinity. The binding
modes of SIRT1 activators indicated that a portion of the activators
interacts with the fluorophore through Ļ-stacking, while the
other portion inserts into the cavity or interacts with the Rossmann
fold, thus increasing the substrate affinity. Our study provides new
insights into the mechanism of SIRT1 activation and may aid the design
of novel SIRT1 activators