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Sökning: onr:"swepub:oai:DiVA.org:umu-81863" > Coating of soluble ...

  • Bolivar, Juan MDepartamento de Biocatálisis, Instituto de Catálisis y Petroleoquímica-CSIC, Cantoblanco, Madrid, Spain (författare)

Coating of soluble and immobilized enzymes with ionic polymers : full stabilization of the quaternary structure of multimeric enzymes

  • Artikel/kapitelEngelska2009

Förlag, utgivningsår, omfång ...

  • 2009-03-06
  • American Chemical Society (ACS),2009
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:umu-81863
  • https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-81863URI
  • https://doi.org/10.1021/bm801162eDOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

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Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • This paper shows a simple and effective way to avoid the dissociation of multimeric enzymes by coating their surface with a large cationic polymer (e.g., polyethylenimine (PEI)) by ionic exchange. As model enzymes, glutamate dehydrogenase (GDH) from Thermus thermophilus and formate dehydrogenase (FDH) from Pseudomonas sp. were used. Both enzymes are very unstable at acidic pH values due to the rapid dissociation of their subunits (half-life of diluted preparations is few minutes at pH 4 and 25 degrees C). GDH and FDH were incubated in the presence of PEI yielding an enzyme-PEI composite with full activity. To stabilize the enzyme-polymer composite, a treatment with glutaraldehyde was required. These enzyme-PEI composites can be crosslinked with glutaraldehyde by immobilizing previously the composite onto a weak cationic exchanger. The soluble GDH-PEI composite was much more stable than unmodified GDH at pH 4 and 30 degrees C (retaining over 90% activity after 24 h incubation) with no effect of the GDH concentration in the inactivation course. The composite could be very strongly, but reversibly, adsorbed on cationic exchangers. Similarly, FDH could be treated with PEI and glutaraldehyde after adsorption on cationic exchangers, This permitted a stabilized FDH preparation. In this way, the coating of the enzymes surfaces with PEI is used as a simple and efficient strategy to prevent enzyme dissociation of multimeric enzymes. These composites can be used as a soluble catalyst or reversibly immobilized onto a cationic exchanger (e.g., CM-agarose).

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Rocha-Martin, JavierDepartamento de Biocatálisis, Instituto de Catálisis y Petroleoquímica-CSIC, Cantoblanco, Madrid, Spain (författare)
  • Mateo, CesarDepartamento de Biocatálisis, Instituto de Catálisis y Petroleoquímica-CSIC, Cantoblanco, Madrid, Spain (författare)
  • Cava, FelipeCBM ‘Severo Ochoa’ CSIC-UAM, Madrid, Spain(Swepub:umu)feca0003 (författare)
  • Berenguer, JoseCBM ‘Severo Ochoa’ CSIC-UAM, Madrid, Spain (författare)
  • Fernandez-Lafuente, RobertoDepartamento de Biocatálisis, Instituto de Catálisis y Petroleoquímica-CSIC, Cantoblanco, Madrid, Spain (författare)
  • Guisan, Jose MDepartamento de Biocatálisis, Instituto de Catálisis y Petroleoquímica-CSIC, Cantoblanco, Madrid, Spain (författare)
  • Departamento de Biocatálisis, Instituto de Catálisis y Petroleoquímica-CSIC, Cantoblanco, Madrid, SpainCBM ‘Severo Ochoa’ CSIC-UAM, Madrid, Spain (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Biomacromolecules: American Chemical Society (ACS)10:4, s. 742-7471525-77971526-4602

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