The present disclosure provides fish-derived peptides with ACE inhibitory activity, and methods of producing peptide isolates comprising the fish-derived peptides. The present disclosure also provides pharmaceutical products, dietary supplements, and functional foods including the peptide isolates, and method of lowering blood pressure of a subject by administering to the subject one or more of the fish-derived peptides.

Provided is a multivalent protein that targets interaction of SARS-CoV-2 spike receptor binding domain (RBD) with the human angiotensin-converting enzyme 2 (ACE2) receptor protein. The multivalent proteins may also be used to treat subjects having cancer and/or a disease and/or viral infection. Also presented is a multiplex lateral flow test strips for simultaneous detection of the virus and viral antibodies.

In the invention is provided a polypeptide comprising at least 75 amino acids and having an amino acid sequence having at least 90%, such as at least 95%, 96%, 97, 98%, or 99%, such as 100% sequence identity (% SI) with human Angiotensin-converting enzyme 2 (ACE2) (SEQ ID NO 1), for use in the treatment of COVID19, SARS, or MERS, characterized in that the polypeptide is administered pulmonary and/or nasally. Further is provided the polypeptide for use in reducing the number of active virus particles being exhaled by a treated subject infected by SARS-CoV-2, SARS-CoV, or Mers-CoV. Also a dry powder or an aerosol comprising the polypeptide.

The present disclosure provides fish-derived peptides with ACE inhibitory activity, and methods of producing peptide isolates comprising the fish-derived peptides. The present disclosure also provides pharmaceutical products, dietary supplements, and functional foods including the peptide isolates, and method of lowering blood pressure of a subject by administering to the subject one or more of the fish-derived peptides.

A method of preventing, reducing a risk of, or treating a virus infection, or preventing or treating a symptom caused by the virus in a subject, said method comprising administering to said subject an effective amount of a fusion protein, wherein the fusion protein comprises a variant angiotensin converting enzyme 2 (ACE2) domain covalently fused to a Fc domain. The variant ACE2 domain comprises a N-terminal deletion, a C-terminal deletion, or both, relative to a full-length wildtype ACE2 having a SEQ ID NO. 1, and the variant ACE2 domain has ACE2 activity. The virus may be SARS-CoV, SARS-CoV-2, or MERS-CoV. The symptom comprises Severe Acute Respiratory Syndrome (SARS), Middle East Respiratory Syndrome (MERS), Acute Respiratory Distress Syndrome (ARDS), Pulmonary Arterial Hypertension (PAH), or Coronavirus Disease 2019 (COVID-19).

A soluble ACF and a truncated form thereof, a fusion protein thereof and preparation methods therefor. A soluble ACEI and a truncated form thereof, as well as a use of the fusion protein in the preparation of a drug for an ACEI-related disease.

A mutant soluble human Ace2 (hAce2) protein useful in preventing infection with betacoronaviruses, including SARS-CoV2 is provided, as are compositions useful in treating disease associated with betacoronavirus, including, e.g, COVID-19. Also provided are compositions containing same formulated for intranasal and/or intrapulmonary delivery, methods of making same and assays. The use of the rAAV compositions for preventing symptoms of COVID-19 infection in humans is provided.

The present invention provides human cells that can be stably infected with coronavirus, as human cells for research on infection with coronavirus such as SARS-CoV-2, as well as, by utilizing the cells, a method for confirming the presence of a coronavirus in a sample, a method for producing a coronavirus, and a method for evaluating the presence or absence of anti-coronavirus activity of a test sample or a substance having an anti-coronavirus neutralizing action in a test sample. Specifically, the present invention relates to a method for preparing a coronavirus-infectious immortalized human myeloid cell, including introducing ACE2 and TMPRSS2 into an immortalized human myeloid cell, and the like.

Angiotensin-converting enzyme 2 (ACE2) has been confirmed as a specific receptor for several β group coronaviruses include severe respiratory syndrome (SARS) coronavirus (SARS-CoV-1) and recently the causative agent for the World pandemic CoVID-19, SARS-CoV-2, and low pathogenic coronavirus of HCoV-NL63, a member in α-coronavirus group. Viral spike protein (S) of viral envelope is confirmed to bind to ACE2 as viral receptor to start a virus replication cycle. The present invention provides ACE2 and its mutants or variants, the viral or non-viral vectors thereof. Methods of treatment of viral infection of a human subject by using such mutants or variants are also provided.

The disclosure provides recombinant polypeptides for treating or preventing viral infection comprising an immunoglobulin Fc fragment and at least one viral receptor or fragment thereof. Also provided are RNA molecules, therapeutic compositions, and expression systems comprising such recombinant polypeptides, along with methods of preventing or treating a viral infection in a subject in need thereof, comprising administering such recombinant polypeptides to a subject or patient.