Construction of two ordered cDNA libraries enriched in genes encoding plasmalemma and tonoplast proteins from a high‐efficiency expression library

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Abstract
We constructed a high‐efficiency expression library from Arabidopsis cDNA clones by introducing a poly (dC) stretch at the 5′ end of the clones. This library enables the synthesis of proteins from all the cDNA clones present. We have screened the high‐efficiency expression library with antibodies raised against total proteins from Arabidopsis plasmalemma and tonoplast. With the positive clones, we have constructed two cDNA ordered libraries enriched in genes encoding plasmalemma (522 clones) and tonoplast proteins (594 clones). Partial sequencing of both libraries shows that a high proportion (47%) of the clones encoded putative membrane proteins, or membrane‐associated proteins. When sequenced, 55% of the cDNAs were new EST sequences for Arabidopsis , 26% were similar to genes present in other plants or organisms, and 29% were not referenced in any databank. Immunoscreening of the two cDNA ordered libraries with antibodies raised against proteins from Arabidopsis cells submitted to osmotic stress allows the selection of genes over‐ and under‐expressed in stress conditions.