Geminiviruses are small, ssDNA-containing plant viruses. Geminiviruses contain three ORFs (designated AL1, AL2, and AL3) that overlap and are specified by multiple polycistronic mRNAs. The AL3 protein comprises approximately 0.05% of the cellular proteins and is present in the soluble and organelle fractions [1]. AL3 may form oligomers [2]. Immunoprecipitation of AL3 in a baculovirus expression system extracts expressing both AL1 Pfam:PF00799 and AL3 showed that the two proteins also complex with each other [2]. The AL3 protein is involved in viral replication.

1: Molecular characterization of the AL3 protein encoded by a bipartite geminivirus. Pedersen TJ, Hanley-Bowdoin L; Virology 1994;202:1070-1075. PMID:8030214

2: Interactions between geminivirus replication proteins. Settlage SB, Miller AB, Hanley-Bowdoin L; J Virol 1996;70:6790-6795. PMID:8794317