Matrix protein 1 mRNA (influenza A) and Matrix protein 2 mRNA (influenza A) (M1 mRNA and M2 mRNA)

The matrix protein 1 (M1) and matrix protein 2 (M2) mRNAs of influenza A virus are transcripts derived from segment 7 of the viral genome. M1 mRNA encodes matrix protein 1, the most abundant structural protein, which forms a scaffold beneath the viral envelope and is central to virion assembly, stability, and disassembly[1][3][4][5][6]. M2 mRNA, generated from the same segment via splicing, encodes matrix protein 2—a small integral membrane protein that forms a homotetrameric proton-selective ion channel essential for viral uncoating and maturation[6]. Both are critical for the influenza replication cycle: M1 mediates interactions between ribonucleoprotein complexes and the viral envelope, while M2’s ion channel activity regulates pH-dependent processes during entry and exit from the host cell[1][6]. Aberrant function or pharmacological inhibition (for example, of the M2 ion channel) impairs infectivity and viral replication. There are currently no approved drugs directly targeting M1; however, several antivirals (e.g., amantadine) act on the M2 ion channel, though widespread resistance limits their use[6]. M1 and M2 mRNAs are important molecular markers for influenza diagnostics but are not themselves therapeutic targets—their protein products serve as such. Therefore, this entry strictly refers to viral mRNAs, which function as intermediates in viral protein synthesis, not standalone drug targets. Clarification: As requested, this entry references "M1 and M2 matrix proteins mRNA" and not simply the protein products. While the proteins themselves are well-established antiviral and structural targets, the mRNAs are primarily relevant as diagnostic biomarkers or for the development of antisense/RNA-targeted antivirals, rather than as direct, conventional therapeutic targets. The most scientifically specific convention is to refer separately to "Matrix protein 1 (M1)" and "Matrix protein 2 (M2)" rather than "M1 and M2 matrix proteins mRNA" as a joint drug target[6].

Other names

Influenza A virus M1 mRNAInfluenza A virus M2 mRNAMatrix protein mRNA (influenza)Segment 7 mRNA (influenza)M1 gene mRNAM2 gene mRNA

Amantadine and rimantadine block the M2 ion channel, inhibiting viral uncoating[6] - No approved drugs act directly on M1, but possible mechanisms include disruption of matrix assembly[4]