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• W2106850668 endingPage "3381" @default.
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• W2106850668 abstract "ABSTRACT Human lactoferrin is an iron-binding glycoprotein that is particularly prominent in exocrine secretions and leukocytes and is also found in serum, especially during inflammation. It is able to sequester iron from microbes and has immunomodulatory functions, including inhibition of both complement activation and cytokine production. This study used mutants lacking pneumococcal surface protein A (PspA) and PspC to demonstrate that the binding of human lactoferrin to the surface of Streptococcus pneumoniae was entirely dependent on PspA. Lactoferrin bound both family 1 and family 2 PspAs. Binding of lactoferrin to PspA was shown by surface colocalization with PspA and was verified by the lack of binding to PspA-negative mutants. Lactoferrin was expressed on the body of the cells but was largely absent from the poles. PspC showed exactly the same distribution on the pneumococcal surface as PspA but did not bind lactoferrin. PspA's binding site for lactoferrin was mapped using recombinant fragments of PspA of families 1 and 2. Binding of human lactoferrin was detected primarily in the C-terminal half of the α-helical domain of PspA (amino acids 167 to 288 of PspA/Rx1), with no binding to the N-terminal 115 amino acids in either strain. The interaction was highly specific. As observed previously, bovine lactoferrin bound poorly to PspA. Human transferrin did not bind PspA at all. The binding of lactoferrin to S. pneumoniae might provide a way for the bacteria to interfere with host immune functions or to aid in the acquisition of iron at the site of infection." @default.
• W2106850668 created "2016-06-24" @default.
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• W2106850668 creator A5071772885 @default.
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• W2106850668 date "2001-05-01" @default.
• W2106850668 modified "2023-10-16" @default.
• W2106850668 title "Characterization of Binding of Human Lactoferrin to Pneumococcal Surface Protein A" @default.
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• W2106850668 doi "https://doi.org/10.1128/iai.69.5.3372-3381.2001" @default.
• W2106850668 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/98296" @default.
• W2106850668 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11292760" @default.
• W2106850668 hasPublicationYear "2001" @default.
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