Human surfactant protein D (SP-D) binds Mycoplasma pneumoniae by high affinity interactions with lipids.

The Journal of Biological Chemistry
Hirofumi ChibaDennis R Voelker

Abstract

Increasing evidence now identifies surfactant protein D (SP-D) as an important element of the innate immune system of the lung. In this study, we examined the interactions of rat and human SP-D with the human pathogen, Mycoplasma pneumoniae. Rat and human SP-D bound the organism with high affinity in a reaction that required Ca(2+) and was inhibited by EGTA. Membranes derived from the organism bound the proteins in a similar manner, except the rat SP-D also exhibited a significant level of Ca(2+)-independent binding. Pretreatment of membranes with proteases did not alter the Ca(2+)-dependent SP-D binding of membranes by either protein. Mannose, glucose, maltose, and inositol, at millimolar concentrations, competed for human SP-D binding to the bacterial membrane. Lipids extracted from membranes and separated by two-dimensional thin layer chromatography bound human SP-D with high affinity in a Ca(2+)-dependent reaction. A tandem mutant of SP-D with E321Q and N323D substitutions, failed to bind M. pneumoniae lipids, directly implicating the carbohydrate recognition domain in the interaction. The interaction of rat and human SP-D with M. pneumoniae was unaffected by the presence of surfactant lipids and the hydrophobic surfactant ...Continue Reading

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Citations

Jun 20, 2013·Journal of Clinical Immunology·Kyung Eun LeeMyung Hyun Sohn
Jul 17, 2003·Clinical Immunology : the Official Journal of the Clinical Immunology Society·Rikke Leth-LarsenUffe Holmskov
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