Abstract:
:Human lactoferrin proteolytically cleaves and inactivates two colonization factors of non-typable Haemophilus influenzae, the IgA protease precursor protein (Iga), and Hap, the non-pilus adhesin by which microoganisms adhere to host epithelial cells and form microcolonies. Iga and Hap are homologous proteins that are members of the autotransporter family of secreted proteins expressed by gram-negative bacteria. Studies of Iga cleaved by lactoferrin, reported here, show that proteolysis occurred within the helper region of Iga (Iga(beta)) domain which anchors the autotransporter within the Haemophilus outer membrane. The amino-terminus of the extracted Iga protein was not modified. The location of the proteolytic active site in human lactoferrin is under study. Lactoferrin proteolysis may attenuate pathogenicity of H. influenzae, an important cause of otitis media.
journal_name
Vaccinejournal_title
Vaccineauthors
Plaut AG,Qiu J,St Geme JW 3rddoi
10.1016/s0264-410x(00)00296-6subject
Has Abstractpub_date
2000-12-08 00:00:00pages
S148-52eissn
0264-410Xissn
1873-2518pii
S0264410X00002966journal_volume
19 Suppl 1pub_type
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