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I previously found a cold-regulated RNA-binding protein gene rbpA (now named rbpA1) in Anabaena variabilis M3 [Sato, N. (1994) Plant Mol. Biol. 24, 819-823]. I show here that this gene is a member of a gene family containing at least eight members as evidenced by Southern blot and immunoblot analyses. I have isolated three additional genes (rbpB, rbpC and rbpD) in this family. Of these, rbpB was 100% identical to the rbpB gene of Anabaena 7120 reported previously. Another gene named rbpA in Anabaena 7120 was also found to exist in A.variabilis M3 with identical sequence and named rbpA2. The amino acid sequences of these gene products were highly conserved, except that the RbpD protein lacked glycine-rich C-terminal domain present in all other known members of the gene family. RNA blot and immunoblot analyses showed that the expression of rbpA1, rbpA2, rbpB, rbpC and rbpD, as well as uncloned rbp genes was regulated by cold, though the exact time-course and extent of response to cold were different among these genes. Gel-filtration assay showed that all of the Rbp proteins have higher affinities to poly(G) and poly(U) than to poly(A) and poly(C).

A family of cold-regulated RNA-binding protein genes in the cyanobacteriumAnabaena variabilisM3