B. Sarkar et al., IDENTIFICATION OF 2 POLY(A) POLYMERASES IN BACILLUS-SUBTILIS, Biochemistry and molecular biology international, 41(5), 1997, pp. 1045-1050
Two poly(A) polymerase activities were identified in extracts of a str
ain of Bacillus subtilis in which the gene for polynucleotide phosphor
ylase was disrupted. Gel filtration studies showed a large difference
in the molecular size of the two poly(A) polymerases. On the other han
d, the two enzymes resembled the two major poly(A) polymerases of Esch
erichia coli both with respect to size and in many of their catalytic
properties. The observation that both B. subtilis and E. coli have two
poly(A) polymerases with many common properties suggest interesting p
arallels in the processing of the 3'-ends of mRNA in gram-positive and
gram-negative bacteria.