Pubblicazioni

Autori:

R., Tomazzolli; G., Guella; G., Bellisola; Colombatti, Marco; G., Menestrina

Titolo:

FLUORESCENT ASSAY TO TEST PROTEIN DISULFIDE ISOMERASE ACTIVITY INDUCED BY THIOREDOXIN REDUCTASE.

Anno:

2004

Tipologia prodotto:

Contributo in atti di convegno

Tipologia ANVUR:

Contributo in Atti di convegno

Lingua:

Inglese

Titolo del Convegno:

SIBPA 2004. XVii Congresso Nazionale della Società di Biofisica Pura ed Applicata

Luogo:

Pisa - Italia

Periodo:

23-25 Settembre 2004

Intervallo pagine:

20-null

Parole chiave:

thioredoxin; thioredoxin reductase; PDI; FRET

Breve descrizione dei contenuti:

In eukaryotic cells the ubiquitous thioredoxin reductase-thioredoxin system (TrxR-Trx) catalyses substrate disulfide reduction using NADPH as a source of reducing equivalents. Thioredoxin forms a superfamily with several other proteins sharing little sequence similarity but possessing a common active site. Among these, protein disulfide isomerase (PDI) is colocalized, in cells,with TrxR and there are now some in vitro evidences that PDI can be a substrate of TrxR1. To further demonstrate this interaction we have now produced a fluorogenic substrate suitable to test TrxR-dependent PDI activity. The substrate was formed by two identical cys-containing tri-peptides linked at the N-terminus to a molecule of fluorescein-5-isothiocyanate (FITC) and held together by a disulfide bridge between the cysteines; it was called pep-FITC. The reduction of pep-FITC was measured at 25°C in a Fluoromax spectrofluorimeter and was demonstrated by an increase of the FITC fluorescence at 520nm with excitation at 494nm. We could show that the TrxR-PDI system successfully reduced pep-FITC, while the isolated components did not. Further proofs of the interaction between PDI and TrxR were obtained by fluorescence resonant energy transfer (FRET). In this case we labelled the enzymes with Alexa Fluor 546 and Alexa Fluor 488 respectively, two dyes forming a donor/acceptor pair with a Forster distance of 58 Å.A FRET was observed under suitable conditions confirming tight interaction.

Id prodotto:

20854

Handle IRIS:

11562/20854

depositato il:

9 settembre 2009

ultima modifica:

3 novembre 2022

Citazione bibliografica:

R., Tomazzolli; G., Guella; G., Bellisola; Colombatti, Marco; G., Menestrina, FLUORESCENT ASSAY TO TEST PROTEIN DISULFIDE ISOMERASE ACTIVITY INDUCED BY THIOREDOXIN REDUCTASE. , Atti di "SIBPA 2004. XVii Congresso Nazionale della Società di Biofisica Pura ed Applicata" , Pisa - Italia , 23-25 Settembre 2004 , 2004 , pp. 20-null

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