Structural highlights
FunctionIGA1_STRR6 Zinc metalloproteinase which cleaves human immunoglobulin A1 (IgA1) in the hinge region.[1] Publication Abstract from PubMedOpportunistic pathogens such as Streptococcus pneumoniae secrete a giant metalloprotease virulence factor responsible for cleaving host IgA1, yet the molecular mechanism has remained unknown since their discovery nearly 30 years ago despite the potential for developing vaccines that target these enzymes to block infection. Here we show through a series of cryo-electron microscopy single particle reconstructions how the Streptococcus pneumoniae IgA1 protease facilitates IgA1 substrate recognition and how this can be inhibited. Specifically, the Streptococcus pneumoniae IgA1 protease subscribes to an active-site-gated mechanism where a domain undergoes a 10.0 A movement to facilitate cleavage. Monoclonal antibody binding inhibits this conformational change, providing a direct means to block infection at the host interface. These structural studies explain decades of biological and biochemical studies and provides a general strategy to block Streptococcus pneumoniae IgA1 protease activity to potentially prevent infection. Mechanism and inhibition of Streptococcus pneumoniae IgA1 protease.,Wang Z, Rahkola J, Redzic JS, Chi YC, Tran N, Holyoak T, Zheng H, Janoff E, Eisenmesser E Nat Commun. 2020 Nov 27;11(1):6063. doi: 10.1038/s41467-020-19887-3. PMID:33247098[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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