Impact of sequence diversity in the Moraxella catarrhalis UspA2/UspA2H head domain on vitronectin binding and antigenic variation.

Su YC, Hallström BM, Bernhard S, Singh B, Riesbeck K

Microbes Infect. 15 (5) 375-387 [2013-05-00; online 2013-03-06]

The nasopharyngeal pathogen Moraxella catarrhalis recruits vitronectin to subvert complement-mediated killing. Ubiquitous surface protein (UspA) 2 and its hybrid form UspA2H bind vitronectin at the highly diverse N-terminal head domain. Here we characterized the sequence diversity of the head domain in multiple M. catarrhalis clinical isolates (n = 51) with focus on binding of vitronectin. The head domain of the uspA2 genes from 40 isolates were clustered according to an N-terminal sequence motif of UspA2 (NTER2), i.e., NTER2A (55% of uspA2 variants), NTER2B (32.5%), NTER2C (5%), and finally a group without an NTER2 (7.5%). Isolates harbouring the uspA2H gene (n = 11) contained N-terminal GGG repeats. Vitronectin binding to isolates having UspA2 did not correlate to variation in the NTER2 motifs but occurred in UspA2H containing 6 or ≥11 of GGG repeats. Analyses of recombinant UspA2/UspA2H head domains of multiple variants showed UspA2-dependent binding to the C-terminal of vitronectin. Furthermore, polyclonal anti-UspA2 antibodies revealed that the head domain of the majority of Moraxella UspA2/2H was antigenically unrelated, whereas the full length molecules were recognized. In conclusion, the head domains of UspA2/2H have extensive sequence polymorphism without losing vitronectin-binding capacity promoting a general evasion of the host immune system.

Affiliated researcher

PubMed 23474333

DOI 10.1016/j.micinf.2013.02.004

Crossref 10.1016/j.micinf.2013.02.004

pii: S1286-4579(13)00033-6
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Publications 7.1.2