The homodimeric hemoglobin from Scapharca can be locked into new cooperative structures upon reaction of Cys92, located at the subunit interface, with organomercurials. (Articolo in rivista)

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  • The homodimeric hemoglobin from Scapharca can be locked into new cooperative structures upon reaction of Cys92, located at the subunit interface, with organomercurials. (Articolo in rivista) (literal)
Anno
  • 1992-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/0014-5793(92)81531-P (literal)
Alternative label
  • Colotti G, Boffi A, Verzili D, Coletta M, Chiancone E. (1992)
    The homodimeric hemoglobin from Scapharca can be locked into new cooperative structures upon reaction of Cys92, located at the subunit interface, with organomercurials.
    in FEBS letters (Print); ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, AMSTERDAM (Paesi Bassi)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Colotti G, Boffi A, Verzili D, Coletta M, Chiancone E. (literal)
Pagina inizio
  • 481 (literal)
Pagina fine
  • 485 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 314 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 5 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 3 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • UNIV ROME, CNR CTR MOLEC BIOL,DEPT BIOCHEM SCI A ROSSI FANELLI,I-00185 ROME,ITALY UNIV CAMERINO,DEPT MOLEC CELLULAR & ANIM BIOL,I-62032 CAMERINO,ITALY (literal)
Titolo
  • The homodimeric hemoglobin from Scapharca can be locked into new cooperative structures upon reaction of Cys92, located at the subunit interface, with organomercurials. (literal)
Abstract
  • In the cooperative, homodimeric hemoglobin from Scapharca inaequivalvis, HbI, the subunit interface is formed by the heme-carrying E and F helices and contains the only cysteine residue of the globin chain (Cys92, F2) in an area which changes from hydrophilic to hydrophobic upon oxygenation. Binding of organomercurials to HbI is cooperative and entails major quaternary rearrangements. The reaction of Cys92 with p-chloromercuri-benzoate (PMB) and p-nitro-o-chloromercuriphenol (PN), a sensitive reporter of the cysteine microenvironment at neutral pH values, has been followed in stopped flow experiments. Kinetic evidence for the cooperativity of mercurial binding has been obtained and the rate of the corresponding conformational transition has been estimated. As expected PN, but not PMB, is able to monitor the oxygen-linked change of the cysteine microenvironment. The modification of Cys92 with PN has unique functional effects. In PN-reacted HbI cooperativity is maintained, albeit to a different extent, depending on the ligation state of the protein during mercaptide formation. It may be envisaged that PN locks the protein into new, cooperative, quaternary structures stabilized by hydrogen bonding interactions between the ionized nitrophenol moiety and the contralateral subunit. (literal)
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