Publication

A human monoclonal antibody that specifically binds and inhibits the staphylococcal complement inhibitor protein SCIN

Hoekstra, H., Romero Pastrana, F., Bonarius, H. P. J., van Kessel, K. P. M., Elsinga, G. S., Kooi, N., Groen, H., van Dijl, J. M. & Buist, G., 2018, In : Virulence. 9, 1, p. 70-82 13 p.

Research output: Contribution to journalArticleAcademicpeer-review

Staphylococcus aureus is a serious public health burden causing a wide variety of infections. Earlier detection of such infections could result in faster and more directed therapies that also prevent resistance development. Human monoclonal antibodies (humAbs) are promising tools for diagnosis and therapy owing to their relatively straightforward synthesis, long history of safe clinical use and high target specificity. Here we show that the humAb 6D4, which was obtained from a random screen of B-cells producing antibodies that bind to whole cells of S. aureus, targets the staphylococcal complement inhibitor (SCIN). The epitope recognized by 6D4 was localized to residues 26 to 36 in the N-terminus of SCIN, which overlap with the active site. Accordingly, 6D4 can inhibit SCIN activity as demonstrated through the analysis of C3b deposition on S. aureus cells and complement-induced lysis of rabbit erythrocytes. Importantly, while SCIN is generally regarded as a secreted virulence factor, 6D4 allowed detection of strongly increased SCIN binding to S. aureus cells upon exposure to human serum, relating to the known binding of SCIN to C3 convertases deposited on the staphylococcal cell surface. Lastly, we show that labeling of humAb 6D4 with a near-infrared fluorophore allows one-step detection of SCIN-producing S. aureus cells. Together, our findings show that the newly described humAb 6D4 specifically recognizes S. aureus SCIN, which can potentially be used for detection of human serum-incubated S. aureus strains expressing SCIN.

Original languageEnglish
Pages (from-to)70-82
Number of pages13
JournalVirulence
Volume9
Issue number1
Early online date16-Feb-2017
Publication statusPublished - 2018

    Keywords

  • Journal Article, PATHOGEN, STRAINS, EPIDERMOLYSIS-BULLOSA, AUREUS BACTEREMIA, IMMUNE EVASION, INFECTIONS, RESISTANCE, RESPONSES, GENOME, VIRULENCE

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