Rotavirus VP4 protein (VP4) (VP4)

The Rotavirus VP4 protein, commonly known as the P protein (protease-sensitive), is a key structural component of the rotavirus outer capsid that functions as a viral spike [1, 3]. It is essential for the virus's life cycle, mediating the initial attachment to host cell receptors and subsequent penetration of the cell membrane [3, 4]. For the virus to become infectious, VP4 must undergo proteolytic cleavage by intestinal enzymes into two subunits, VP5* and VP8* [1, 4]. In vaccine development, "P reassortants" are created by combining the VP4 gene from a human rotavirus strain with a bovine rotavirus backbone, a strategy used in the RotaTeq vaccine to provide immunity against common human P genotypes like P[8] [2]. By presenting this specific protein to the immune system, the vaccine induces the production of neutralizing antibodies that prevent the virus from entering host cells, thereby protecting against severe gastroenteritis [2, 3]. This reassortment technique allows for the creation of a live-attenuated virus that expresses human-specific antigens while maintaining the attenuated characteristics of the bovine parent strain [2]. The VP4 protein is a major determinant of viral host range and tissue tropism, making it a primary target for neutralizing immunity [3, 4]. Consequently, monitoring the genetic diversity of the VP4 gene is crucial for assessing vaccine efficacy against emerging rotavirus strains [3].

Other names

P proteinProtease-sensitive proteinSpike protein VP4Outer capsid protein VP4P[8] reassortant

Induction of neutralizing antibodies that target the VP4 spike protein to inhibit viral attachment and entry into host enterocytes [2, 3].