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The RNA I modulator protein (Rom) acts as a co-regulator of ColE1 plasmid copy number by binding to RNA kissing hairpins and stabilizing their interaction. The structure of Rom has been determined in a new crystal form from X-ray diffraction data to 2.5 A resolution. In this structure, a dimer of...
Plant acid invertases catalyse the breakdown of sucrose. Their activity is tightly regulated through interaction with specific protein inhibitors. The complex between the cell-wall invertase inhibitor Nt-CIF and its target enzyme is stable only at acidic pH, as found in the plant cell wall. Since...