Typical of all mastreviruses, MSV's circular, ~2.7-Kb monopartite single-stranded (ss) DNA genome encodes only four proteins. Bidirectional transcription from a long intergenic region (LIR) results in the virion-sense expression of a movement protein (MP) and a coat protein (CP), and the complementary-sense expression of the replication-associated proteins, Rep and RepA.
Mastreviruses are distinguished by their compact, circular DNA genome (~2.7-Kb) that produces only four proteins. The transcription process commences from a long intergenic region (LIR), generating two proteins crucial for movement (MP) and coat assembly (CP), as well as two proteins vital for replication (Rep and RepA).