6533b826fe1ef96bd12846f4
RESEARCH PRODUCT
Functional and dysfunctional conformers of human neuroserpin characterized by optical spectroscopies and Molecular Dynamics
Matteo LevantinoMaria Rosalia MangioneAntonio CupaneMartino BolognesiStefano RicagnoVincenzo MartoranaRosina NotoMaria Grazia SantangeloMauro MannoDaniele ParisiDaniele Parisisubject
Protein FoldingCircular dichroismSerine Proteinase InhibitorsProtein ConformationStereochemistryNeuroserpinBiophysicsEpilepsies MyoclonicMolecular Dynamics SimulationSerpinMolecular DynamicsBiochemistryProtein Structure SecondaryArticleFluorescenceAnalytical ChemistryMolecular dynamicsProtein structureNeuroserpinmedicineHumansProtein IsoformsFluorescence emission spectra; circular dichroism; neuroserpin latent conformationneuroserpin latent conformationFamilial encephalopathy with neuroserpin inclusion bodiesMolecular BiologyConformational isomerismSerpinsFluorescence emission spectraSerpinChemistryCircular DichroismConformational diseaseNeuropeptidesHydrogen Bondingmedicine.diseaseSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Heredodegenerative Disorders Nervous SystemProtein foldingdescription
Neuroserpin (NS) is a serine protease inhibitor (SERPIN) involved in different neurological pathologies, including the Familial Encephalopathy with Neuroserpin Inclusion Bodies (FENIB), related to the aberrant polymerization of NS mutants. Here we present an in vitro and in silico characterization of native neuroserpin and its dysfunctional conformation isoforms: the proteolytically cleaved conformer, the inactive latent conformer, and the polymeric species. Based on circular dichroism and fluorescence spectroscopy, we present an experimental validation of the latent model and highlight the main structural features of the different conformers. In particular, emission spectra of aromatic residues yield distinct conformational fingerprints, that provide a novel and simple spectroscopic tool for selecting serpin conformers in vitro. Based on the structural relationship between cleaved and latent serpins, we propose a structural model for latent NS, for which an experimental crystallographic structure is lacking. Molecular Dynamics simulations suggest that NS conformational stability and flexibility arise from a spatial distribution of intramolecular salt-bridges and hydrogen bonds.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-02-01 | Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics |