Pediococcus inopinatus

Figure 7.7 Hypothetical horizontal transfer of horA and horC. Two modes of horizontal transfer of hop resistance genes, plasmid-mediated (a) and transposon-mediated (b) types, have been postulated on the basis of the nucleotide sequence identities and open reading frame analysis of horA- and /torC-containing DNA regions identified in Lactobacillus brevis, Lactobacillus lindneri, Lactobacillus paracolllnoides, Lactobacillus backi, Pediococcus damnosus, and Pediococcus inopinatus. The exact mechanisms underlying the horizontal gene transfer of horA and horC are currently unknown, but several mechanisms, including conjugative transmission of hop resistance genes, are postulated.

Among the approved species of Pediococcus (Garvie 1986), only four have been isolated from wines P. damnosus, P. parvulus, P. inopinatus and P. pentosaceus (Davis et al. 1986 Edwards and Jensen 1992) P. pentosaceus and P. parvulus are the most common species in this medium. 

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