Abstract
In higher plant, storage proteins are synthesized on rough ER as precursors and then are transported to protein storage vacuoles to be processed into mature forms. We recently reported an Arabidopsis mutant, maigo2 (mag2), which accumulated large amount of novel structures in the ER (1). The structures contain an electron-dense core which is composed of the precursor forms of 2S albumin. MAG2 protein might function as a complex with ER-localized SNAREs, involving the exit of storage protein precursors from the ER. In order to clarify mechanism of MAG2-dependent transport, we identified factors that form a complex with MAG2. Here, we report characterization of one of the factors, designated MAG2-complex component 1 (MACC1). Our results suggest that MACC1 plays a significant role in the transport of storage proteins in Arabidopsis.
(1) Li et al., Plant Cell 18: 3535-3547 (2006)
