Target intelligence / Profile preview

Vaccinia virus p37 protein (p37 (F13L))

Target
p37 (F13L)
Molecular classification
Viral protein
01

Overview

The vaccinia virus p37 protein (F13L, also called VP37) is a viral envelope protein required for the formation and egress of extracellular virus particles in orthopoxvirus infections, including smallpox and monkeypox. Tecovirimat (ST-246) specifically targets the p37 protein, disrupting its interaction with host proteins Rab9 and TIP47, thereby blocking viral envelopment and release from infected cells. This mode of action is highly specific for orthopoxviruses, and tecovirimat is orally bioavailable, with demonstrated efficacy and safety in animal models and human trials. Resistance mutations can occur at the VP37 dimer interface. No notable off-target cytotoxicity has been observed in laboratory studies.

Other names
F13L proteinorthopoxvirus VP37 envelope wrapping proteinp37 viral protein
02

Mechanism of action

Inhibition of p37/F13L protein, blocking formation of extracellular enveloped virus particles and preventing viral egress from infected cells

03

Biological functions

Viral envelopmentSecretion of extracellular forms of virusVirus egress
04

Disease associations

Infection (orthopoxvirus diseases including smallpox, monkeypox, cowpox)
05

Safety considerations

Resistance mutations in VP37/F13L, especially during prolonged therapy in immunocompromised individualsPotential for hypoglycemia with coadministration of repaglinideNo significant genotoxicity, bone marrow toxicity, or chromosomal aberrations observed in preclinical studies
06

Interacting drugs

Tecovirimat (ST-246, TPOXX)

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