Crystallographic and spectroscopic characterizations of Sulfolobus solfataricus TrxA1 provide insights into the determinants of thioredoxin fold stability (Articolo in rivista)

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  • Crystallographic and spectroscopic characterizations of Sulfolobus solfataricus TrxA1 provide insights into the determinants of thioredoxin fold stability (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.jsb.2011.10.014 (literal)
Alternative label
  • Esposito L, Ruggiero A, Masullo M, Ruocco MR, Lamberti A, Arcari P, Zagari A, Vitagliano L (2012)
    Crystallographic and spectroscopic characterizations of Sulfolobus solfataricus TrxA1 provide insights into the determinants of thioredoxin fold stability
    in Journal of structural biology (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Esposito L, Ruggiero A, Masullo M, Ruocco MR, Lamberti A, Arcari P, Zagari A, Vitagliano L (literal)
Pagina inizio
  • 506 (literal)
Pagina fine
  • 512 (literal)
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  • 177 (literal)
Rivista
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  • 7 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 2 (literal)
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  • Istituto di Biostrutture e Bioimmagini, CNR, Via Mezzocannone 16, I-80134 Napoli, Italy. (literal)
Titolo
  • Crystallographic and spectroscopic characterizations of Sulfolobus solfataricus TrxA1 provide insights into the determinants of thioredoxin fold stability (literal)
Abstract
  • Structural characterizations of thioredoxins (Trxs) are important for their involvement in severe pathologies and for their stable scaffold. Here we report a combined structural and spectroscopic characterization of a Trx isolated from the hyperthermophilic archaeon Sulfolobus solfataricus (SsTrxA1). Thermal denaturation unveils that SsTrxA1 is endowed with a remarkable stability in the explored temperature range 50-105°C. The structure of the oxidized form of SsTrxA1 determined at 1.9Å resolution presents a number of peculiar features. Although the protein was crystallized in a slightly acid medium (pH 6.5) as many as ten intramolecular/intermolecular carboxyl-carboxylate interactions involving glutamic and aspartic acid side chains are found in three independent SsTrxA1 molecules present in the asymmetric unit. Surprisingly for a hyperthermostable protein, the structure of SsTrxA1 is characterized by the presence (a) of a very limited number of intramolecular salt bridges and (b) of a cavity nearby Cys52, a residue that is frequently a phenylananine in other members of the family. Chemical denaturation investigations carried out on SsTrxA1 and SsTrxA2 show that both proteins present a significant stability against guanidine hydrochloride, thus indicating that ionic interactions play a minor role in their stabilization. Compared to Trxs from mesophilic sources, SsTrxA1 displays a longer ?-helix 1 and a shorter loop connecting this ?-helix with ?-strand 2. As these features are shared with Trxs isolated from thermophilic sources, the shortening of this loop may be a general strategy adopted to stabilize this fold. This feature may be exploited for the design of hyperthermostable Trx scaffolds. (literal)
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