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Strong Ionic Interactions Between Mucins And Two Basic Proteins, Mucus Proteinase Inhibitor And Lysozyme, In Human Bronchial Secretions.

I. Van-Seuningen, N. Houdret, A. Hayem, M. Davril
Published 1992 · Chemistry, Medicine

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1. Mucins were isolated from sputum from a patient with chronic bronchitis and subjected to two different preparation procedures. 2. In the first procedure, CsBr density-gradient centrifugation gave rise to two well-separated fractions. Mucins recovered in the high-density fraction still contained mucus proteinase inhibitor (MPI) and lysozyme (LSZ). 3. Mucins were purified after a second step of CsBr density-gradient centrifugation or after gel-filtration chromatography with a buffer of high ionic strength, containing 0.5 M NaCl. 4. In the second procedure, trichloroacetic acid treatment of whole sputum followed by cation-exchange chromatography allowed the obtention of a non-retained fraction composed of mucins. 5. Gel-filtration in buffer containing 0.5 M NaCl, allowed the release of MPI and LSZ from mucins, thus confirming that interactions still occurred between those components. 6. The chemical compositions of the mucins isolated by the two above procedures were quite similar. 7. These data support the hypothesis of the existence of ionic interactions between basic amino acid residues of MPI and LSZ and acid residues of the carbohydrate chains of mucins in the secretions of the large airways. 8. These interactions could play a role in the protection of mucins against proteolysis and consequently in the maintenance of rheological properties of the mucus gel in disease.
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