http://www.cnr.it/ontology/cnr/individuo/prodotto/ID172737
Assignment of the binding site for haptoglobin on apolipoprotein A-I (Articolo in rivista)
- Type
- Label
- Assignment of the binding site for haptoglobin on apolipoprotein A-I (Articolo in rivista) (literal)
- Anno
- 2005-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1074/jbc.M411390200 (literal)
- Alternative label
Spagnuolo, Maria Stefania; Cigliano, Luisa; D'Andrea, Luca D.; Pedone, Carlo; Abrescia, Paolo. (2005)
Assignment of the binding site for haptoglobin on apolipoprotein A-I
in The Journal of biological chemistry (Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Spagnuolo, Maria Stefania; Cigliano, Luisa; D'Andrea, Luca D.; Pedone, Carlo; Abrescia, Paolo. (literal)
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- Pubblicazione su rivista scientifica (literal)
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Cigliano L.; Abrescia P. Dipartimento di Fisiologia Generale ed Ambientale, Università di Napoli Federico II
Pedone C. Dipartimento di Chimica Biologica, Universita` di Napoli Federico II (literal)
- Titolo
- Assignment of the binding site for haptoglobin on apolipoprotein A-I (literal)
- Abstract
- Haptoglobin (Hpt) was previously found to bind the high density lipoprotein (HDL) apolipoprotein A-I (ApoA-I) and able to inhibit the ApoA-I-dependent activity of the enzyme lecithin:cholesterol acyltransferase (LCAT), which plays a major role in the reverse cholesterol transport. The ApoA-I structure was analyzed to detect the site bound by Hpt. ApoA-I was treated by cyanogen bromide or hydroxylamine; the resulting fragments, separated by electrophoresis or gel filtration, were tested by Western blotting or enzyme-linked immunosorbent assay for their ability to bind Hpt. The ApoA-I sequence from Glu113 to Asn184 harbored the binding site for Hpt. Biotinylated peptides were synthesized overlapping such a sequence, and their Hpt binding activity was determined by avidin-linked peroxidase. The highest activity was exhibited by the peptide P2a, containing the ApoA-I sequence from Leu141 to Ala164. Such a sequence contains an ApoA-I domain required for binding cells, promoting cholesterol efflux, and stimulating LCAT. The peptide P2a effectively prevented both binding of Hpt to HDL-coated plastic wells and Hpt-dependent inhibition of LCAT, measured by anti-Hpt antibodies and cholesterol esterification activity, respectively. The enzyme activity was not influenced, in the absence of Hpt, by P2a. Differently from ApoA-I or HDL, the peptide did not compete with hemoglobin for Hpt binding in enzyme-linked immunosorbent assay experiments. The results suggest that Hpt might mask the ApoA-I domain required for LCAT stimulation, thus impairing the HDL function. Synthetic peptides, able to displace Hpt from ApoA-I without altering its property of binding hemoglobin, might be used for treatment of diseases associated with defective LCAT function. (literal)
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