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Half‐life of Escherichia coli polyadenylated lipoprotein mRNA
Author(s) -
Taljanidisz Janos,
Shen Ping,
Sarkar Nilima
Publication year - 1997
Publication title -
iubmb life
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.132
H-Index - 113
eISSN - 1521-6551
pISSN - 1521-6543
DOI - 10.1080/15216549700202601
Subject(s) - polyadenylation , messenger rna , rna , microbiology and biotechnology , biology , escherichia coli , gene expression , gene , chemistry , biochemistry
In the light of recent evidence that the half‐life of bacterial mRNA may be modulated by polyadenylation at the 3′ end, we determined the half‐life of polyadenylated lpp mRNA, which is an abundant and comparatively stable message encoding a major lipoprotein of the outer membrane. Messenger RNAs were pulse‐labeled with [3H] adenosine and poly(A) RNA was isolated at various times after pulse‐labeling by affinity chromatography on oligo(dT) cellulose. The amount of lpp mRNA remaining was quantitated by hybridization with the antisense strand of the lpp gene cloned in M 13mp18. The observed half‐life for polyadenylated lpp mRNA was 12 min. This represents the first half‐life measurement for a specific polyadenylated mRNA in E. coli, and is slightly longer than the half‐life of total lpp RNA reported earlier. It coincides with the functional half‐life for lpp mRNA determined by Inouye and coworkers by measuring the rate of lipoprotein synthesis at various times after rifampicin addition. This suggests that polyadenylated lpp RNA is the predominant and translationally active form of lpp mRNA within the cell.