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The structure of a ...
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Fa, MingUmeå universitet,Institutionen för medicinsk kemi och biofysik
(författare)
The structure of a serpin–protease complex revealed by intramolecular distance measurements using donor–donor energy migration and mapping of interaction sites
- Artikel/kapitelEngelska2000
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Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:umu-8572
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-8572URI
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https://doi.org/10.1016/S0969-2126(00)00121-0DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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Background: The inhibitors that belong to the serpin family are widely distributed regulatory molecules that include most protease inhibitors found in blood. It is generally thought that serpin inhibition involves reactive-centre cleavage, loop insertion and protease translocation, but different models of the serpin–protease complex have been proposed. In the absence of a spatial structure of a serpin–protease complex, a detailed understanding of serpin inhibition and the character of the virtually irreversible complex have remained controversial.Results: We used a recently developed method for making precise distance measurements, based on donor–donor energy migration (DDEM), to accurately triangulate the position of the protease urokinase-type plasminogen activator (uPA) in complex with the serpin plasminogen activator inhibitor type 1 (PAI-1). The distances from residue 344 (P3) in the reactive-centre loop of PAI-1 to residues 185, 266, 313 and 347 (P1′) were determined. Modelling of the complex using this distance information unequivocally placed residue 344 in a position at the distal end from the initial docking site with the reactive-centre loop fully inserted into β sheet A. To validate the model, seven single cysteine substitution mutants of PAI-1 were used to map sites of protease–inhibitor interaction by fluorescence depolarisation measurements of fluorophores attached to these residues and cross-linking using a sulphydryl-specific cross-linker.Conclusions: The data clearly demonstrate that serpin inhibition involves reactive-centre cleavage followed by full-loop insertion whereby the covalently linked protease is translocated from one pole of the inhibitor to the opposite one.
Ämnesord och genrebeteckningar
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Cross-linking
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Donor–donor energy migration
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Fluorescence
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Intramolecular distance
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PAI-1
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serpin
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Bergström, FredrikUmeå universitet,Kemiska institutionen
(författare)
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Hägglöf, PeterUmeå universitet,Institutionen för medicinsk kemi och biofysik
(författare)
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Wilczynska, MalgorzataUmeå universitet,Institutionen för medicinsk kemi och biofysik(Swepub:umu)mawi0006
(författare)
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Johansson, Lennart B-ÅUmeå universitet,Kemiska institutionen(Swepub:umu)lejo0007
(författare)
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Ny, TorUmeå universitet,Institutionen för medicinsk kemi och biofysik(Swepub:umu)tony0001
(författare)
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Umeå universitetInstitutionen för medicinsk kemi och biofysik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Structure8:4, s. 397-405
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