Journal
PLOS PATHOGENS
Volume 11, Issue 2, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.ppat.1004657
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Funding
- Swedish Research Council [2013-2753, 2013-8616]
- Knut & Alice Wallenberg Foundation [KAW 2013.0019]
- Swedish Cancer Society [CAN 2011/340]
- United Kingdom Research Council Basic Technology Initiative Glycoarrays [GRS/79268]
- Translational Grant [EP/G037604/1]
- Wellcome Trust [WT093378MA, WT099197MA]
- Deutsche Forschungsgemeinschaft [SFB-685]
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Most adenoviruses attach to host cells by means of the protruding fiber protein that binds to host cells via the coxsackievirus and adenovirus receptor (CAR) protein. Human adenovirus type 52 (HAdV-52) is one of only three gastroenteritis-causing HAdVs that are equipped with two different fiber proteins, one long and one short. Here we show, by means of virion-cell binding and infection experiments, that HAdV-52 can also attach to host cells via CAR, but most of the binding depends on sialylated glycoproteins. Glycan microarray, flow cytometry, surface plasmon resonance and ELISA analyses reveal that the terminal knob domain of the long fiber (52LFK) binds to CAR, and the knob domain of the short fiber (52SFK) binds to sialylated glycoproteins. X-ray crystallographic analysis of 52SFK in complex with 2-O-methylated sialic acid combined with functional studies of knob mutants revealed a new sialic acid binding site compared to other, known adenovirus: glycan interactions. Our findings shed light on adenovirus biology and may help to improve targeting of adenovirus-based vectors for gene therapy.
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