Evidence map›Paper›PMID 27053426›Full record

ArticleScientific reports2016

Allosteric Partial Inhibition of Monomeric Proteases. Sulfated Coumarins Induce Regulation, not just Inhibition, of Thrombin.

Stephen Verespy, Akul Y Mehta, Daniel Afosah, Rami A Al-Horani, Umesh R Desai

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed
3.2field-weighted citation impact, top 8% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

20 citing papers in PubMed, 36 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 1 institution in 1 country.

Stephen VerespyInstitute for Structural Biology, Drug Discovery and Development, Virginia Commonwealth University, Richmond, Virginia, USA.
Akul Y MehtaInstitute for Structural Biology, Drug Discovery and Development, Virginia Commonwealth University, Richmond, Virginia, USA.
Daniel AfosahInstitute for Structural Biology, Drug Discovery and Development, Virginia Commonwealth University, Richmond, Virginia, USA.
Rami A Al-HoraniInstitute for Structural Biology, Drug Discovery and Development, Virginia Commonwealth University, Richmond, Virginia, USA.
Umesh R DesaiInstitute for Structural Biology, Drug Discovery and Development, Virginia Commonwealth University, Richmond, Virginia, USA.
Virginia Commonwealth University · US

Funding

Therapeutic assessment of synthetic heparin sulfates in transplantation modelsP01HL107152 · NHLBI · VIRGINIA COMMONWEALTH UNIVERSITY · PI DESAI, UMESH RAMANLAL · 2011 to 2017
$15.8M
Dual Direct Inhibitors of Thrombin and Factor XaR01HL090586 · NHLBI · VIRGINIA COMMONWEALTH UNIVERSITY · PI DESAI, UMESH RAMANLAL · 2009 to 2018
$3.9M
Advanced Skills Development in Glyco-Hematology and Glyco-OncologyR25HL128639 · NHLBI · VIRGINIA COMMONWEALTH UNIVERSITY · PI DESAI, UMESH RAMANLAL · 2015 to 2019
$613k
NHLBI NIH HHS HL090586NHLBI NIH HHS HL107152NHLBI NIH HHS HL128639NHLBI NIH HHS P01 HL107152NHLBI NIH HHS R01 HL090586NHLBI NIH HHS R25 HL128639
6 · The paper itself

Abstract

Allosteric partial inhibition of soluble, monomeric proteases can offer major regulatory advantages, but remains a concept on paper to date; although it has been routinely documented for receptors and oligomeric proteins. Thrombin, a key protease of the coagulation cascade, displays significant conformational plasticity, which presents an attractive opportunity to discover small molecule probes that induce sub-maximal allosteric inhibition. We synthesized a focused library of some 36 sulfated coumarins to discover two agents that display sub-maximal efficacy (~50%), high potency (<500 nM) and high selectivity for thrombin (>150-fold). Michaelis-Menten, competitive inhibition, and site-directed mutagenesis studies identified exosite 2 as the site of binding for the most potent sulfated coumarin. Stern-Volmer quenching of active site-labeled fluorophore suggested that the allosteric regulators induce intermediate structural changes in the active site as compared to those that display ~80-100% efficacy. Antithrombin inactivation of thrombin was impaired in the presence of the sulfated coumarins suggesting that allosteric partial inhibition arises from catalytic dysfunction of the active site. Overall, sulfated coumarins represent first-in-class, sub-maximal inhibitors of thrombin. The probes establish the concept of allosteric partial inhibition of soluble, monomeric proteins. This concept may lead to a new class of anticoagulants that are completely devoid of bleeding.

Indexed as

Allosteric RegulationBlood Coagulation FactorsCatalytic DomainCoumarinsHumansProtease InhibitorsProtein ConformationSulfatesThrombinBlood Coagulation FactorsCoumarinsProtease InhibitorsSulfatesThrombin

Identifiers

PMID27053426
PMCPMC4823711
OpenAlexW2318168713

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.