Human coronavirus HKU1 (isolate N2) Hemagglutinin-esterase (His) is expressed in E. coli expression system with N-10xHis tag. The predicted molecular weight is 45.9 kDa and the accession number is Q14EB1.

HCoV-HKU1

E. coli

Hemagglutinin-esterase,HE,E3 glycoprotein

YGFNEPLNVVSHLNHDWFLFGDSRSDCNHINNLKIKNYGYLDIHPSLCNNGKISSSAGDSIFKSYHFTRFYNYTGEGDQIIFYEGVNFNPHHRFKCFFNGSNDVWIFNKVRFYRALYSNMALFRYLTFVDILYNFSFSIKANICNSNILSLNNPIFISTNYSKDVYFTLSGCSLYLVPLCLFKSNFSQYYYNMDTGFAYGYSNFVSSDLDCTYISLKPGSYKIFSTGFVLSIPTKALCFNKSKQFVPVQVVDSRWNNLRASDTSLSDACQLPYCYFRNSSGNYVGKYDINHGDNGFTSILSGLLYNVSCISYYGSFLYDNFTSIWPRFSFGNCPTSAYIKLNCFYDPLPIILQGILLFLALLFIVFLLFLVYHG

12-385 aa

> 85% as determined by SDS-PAGE.

Reconstitute the lyophilized protein in sterile deionized water. The product concentration should not be less than 100 μg/mL. Before opening, centrifuge the tube to collect powder at the bottom. After adding the reconstitution buffer, avoid vortexing or pipetting for mixing.

Lyophilized powders can be stably stored for over 12 months, while liquid products can be stored for 6-12 months at -80°C. For reconstituted protein solutions, the solution can be stored at -20°C to -80°C for at least 3 months. Please avoid multiple freeze-thaw cycles and store products in aliquots.

Structural protein that makes short spikes at the surface of the virus. Contains receptor binding and receptor-destroying activities. Mediates de-O-acetylation of N-acetyl-4-O-acetylneuraminic acid, which is probably the receptor determinant recognized by the virus on the surface of erythrocytes and susceptible cells. This receptor-destroying activity is important for virus release as it probably helps preventing self-aggregation and ensures the efficient spread of the progeny virus from cell to cell. May serve as a secondary viral attachment protein for initiating infection, the spike protein being the major one. May become a target for both the humoral and the cellular branches of the immune system.