Short Communication

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Abstract
Recently we developed a method called direct interaction rescue (DIRE) for selective cloning in filamentous phage. The rescue is effected by the interaction of two heterologous proteins, one fused to the N-terminus of gene 3 adhesion protein, the other fused to the C-terminus. When heterologous fusion proteins interact with each other, gene 3 protein activity in restored thereby rescuing phage infectivity. We have used the leucine zipper of c-Jun protein as a 'bait' to select for interacting proteins from a human cDNA library. Two interacting clones were isolated, one coding for ribosomal protein L18a, a component of the large ribosomal subunit, and the other for tropomyosin, a component of the cytoskeleton. L18a contains two zipper-like domains which probably interact with c-Jun. We consider it possible that L18a (and tropomyosin) are involved in the cellular regulation of Jun protein levels.

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