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. 1994 Apr;176(7):1944–1948. doi: 10.1128/jb.176.7.1944-1948.1994

Expression of the Prevotella loescheii adhesin gene (plaA) is mediated by a programmed frameshifting hop.

J N Manch-Citron 1, J London 1
PMCID: PMC205298  PMID: 8144461

Abstract

The 2.4-kb plaA gene, which encodes a Prevotella loescheii galactoside-specific adhesin, contains a programmed frameshifting hop. The frameshift region consists of two UAA termination codons, two repeats of four identical bases between the terminators, and a stem-loop structure that has the potential to form a pseudoknot located downstream from the second UAA. The stem-loop and pseudoknot are features found in a number of retroviruses where frameshifting is a more common occurrence. The terminators, sequence repeats, and secondary structures were identified in both the P. loescheii plaA gene and the mRNA transcript. An in-frame fusion of the entire plaA frameshift region between codons 9 and 10 of the lacZ gene permitted relatively efficient expression (4 to 25% of that of the control) of beta-galactosidase in Escherichia coli.

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Selected References

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