For CAR discussion studies: CM5 sensor chips, amine-coupling kit, and HBS-EP+ buffer (10 mM HEPES, 150 mM NaCl, 3 mM EDTA, 0
For CAR discussion studies: CM5 sensor chips, amine-coupling kit, and HBS-EP+ buffer (10 mM HEPES, 150 mM NaCl, 3 mM EDTA, 0.005% [vol/vol] surfactant P20, pH 7.4) were all purchased from GE Healthcare. active or inactive forms of P4 (inhibitor of glycolipid synthesis). CT-B binding was analyzed using circulation cytometry. (B) lectin type PF-03814735 II (MAL-II; preferentially binds to 2,3-linked sialic acid), lectin (SNA; preferentially binds to 2,6-linked sialic acid), or both. Virion binding was quantified by liquid scintillation counting. The experiment was performed three times with duplicate samples in each experiment. Error bars symbolize mean SD.(TIF) ppat.1004657.s008.tif (1.0M) GUID:?76219ECC-86BB-49C8-A6E4-9F404F07B3C2 S9 Fig: Assessment of the polar contacts of HAdV-52 and HAdV-37 certain to sialic acid. The sialic acid moieties of HAdV-52 and HAdV-37 (PDB-ID: 1UXA) were superimposed using the align function in PyMOL (The PyMOL Molecular Graphics System, Version 184.108.40.206 Schr?dinger, LLC). The sialic acid moiety of HAdV-52 is definitely demonstrated in orange, and the sialic acid bound to HAdV-37 is definitely overlaid like a ghost. Polar contacts created with HAdV-52 and the respective residues are coloured orange, contacting residues PF-03814735 of HAdV-37 and the respective bonds are coloured light blue. Although the binding pocket of HAdV-37 is located in an entirely different part of the knob and the interacting amino acids are not conserved, the polar contacts created are highly similar to those of the RGN motif. The salt bridge contributed by R316 in HAdV-52 is definitely created by K345 in HAdV-37. The hydrogen bonds created with the sugars O4 and N-acetyl group will also be retained.(TIF) ppat.1004657.s009.tif (4.1M) GUID:?1705F59E-3590-442A-9ECC-53E64483450C S10 Fig: Conservation of sialic acid-interacting residues in 52SFK. Sialic acid-interacting PF-03814735 residues in 52SFK are demonstrated on red background, together with similar, potential sialic acid-interacting residues of additional AdV:s. Representative types have been selected from human being varieties A-G and canine varieties A (HA-G and CA, respectively). Secondary-structure elements (beta strands) of HAdV-5 are indicated by arrows.(TIF) ppat.1004657.s010.tif (969K) GUID:?25EEDBAE-A740-4317-B3E8-0BF3C89D9E30 S11 Fig: Trimerization of HAdV-52 knobs. A) 52SFK wt and B) 52SFK R316A mutant were separated according to size using gas-phase electrophoretic mobility molecular analysis (GEMMA). Results are demonstrated as number of molecules (particles) in respect to molecular excess weight (kDa).(TIF) ppat.1004657.s011.tif (4.3M) GUID:?5B9877BA-058D-404E-8E46-94239B7F256F S12 Fig: X-ray data collection and refinement statistics. Values for the highest resolution shell are demonstrated in parenthesis.(TIF) ppat.1004657.s012.tif (348K) GUID:?897B0193-B30D-41E7-96B4-3DE41BEAE229 Data Availability StatementAll relevant data are within the paper and its Supporting Info files except for the gene sequence of native HAdV-52 fiber-1 which is available from Genbank under the accession number DQ923122.2, the Protein sequence database access for native dietary fiber-1 (Accession code ABK35058.1), as well as the PDB access of the construct used in this publication (PDB ID 4XL8). Abstract Most adenoviruses attach to host cells by means of the protruding dietary fiber Rgs5 protein that binds to sponsor cells via the coxsackievirus and adenovirus receptor (CAR) protein. Human being adenovirus type 52 (HAdV-52) is definitely one of only three gastroenteritis-causing HAdVs that are equipped with two different dietary fiber proteins, one long and one short. Here we display, by means of virion-cell binding and illness experiments, that HAdV-52 can also attach to sponsor cells via CAR, but most of the binding depends on sialylated glycoproteins. Glycan microarray, circulation cytometry, surface plasmon resonance and ELISA analyses reveal the terminal knob website of the long dietary fiber (52LFK) binds to CAR, and the knob website of the short dietary fiber (52SFK) binds to sialylated glycoproteins. X-ray crystallographic analysis of 52SFK in complex with 2-neuraminidase reduced HAdV-52 binding to background levels for those cells except to CHO-CAR. To test if this neuraminidase eliminated sialic acids with equivalent effectiveness from all cells, we treated the cells with neuraminidase and quantified MAL-II lectin binding. This treatment reduced MAL-II binding to background levels (S1 Fig.) and we consequently concluded that HAdV-52 could bind to CHO-CAR individually of sialic acid. As HAdV-52 bound with equal effectiveness to Pro-5, CHO-MOCK, and CHO-CD46, and as neuraminidase treatment of CHO-CD46 cells reduced HAdV-52 binding efficiently, these results show that CD46 is probably of no or low importance like a receptor for HAdV-52. HAdV-52 also infected Pro-5 cells more efficiently than Lec2 cells, and pretreatment of Pro-5 cells with neuraminidase abolished illness (Fig. 1B). HAdV-52 is definitely associated with gastroenteritis, but the number of human being cases described is limited and the cellular tropism of the disease is unclear. We consequently investigated the relative contributions of sialic acid and CAR using respiratory A549 cells, which.