
Full text loading...
Category: Environmental Microbiology
Extremophilic Vibrionaceae, Page 1 of 2
< Previous page | Next page > /docserver/preview/fulltext/10.1128/9781555815714/9781555813659_Chap11-1.gif /docserver/preview/fulltext/10.1128/9781555815714/9781555813659_Chap11-2.gifAbstract:
Currently, eight genera are included in the extremophilic Vibrionaceae. According to Bergey’s Manual of Systematic Bacteriology, these genera are Allomonas, Catenococcus, Enhydrobacter, Grimontia, Listonella, Photobacterium, Salinivibrio, and Vibrio. Any luminous spots appearing after overnight incubation generally belong to P. phosphoreum. This organism is an important source of spoilage of modified atmosphere-packed fish products stored at low temperatures, where it respires trimethylamine oxide and produces trimethylamine. One of the challenges in describing low-temperature adaptation in the Vibrionaceae is that many of the model systems that have been used for the studies have undergone taxonomic reclassification. Among the cold shock proteins (CSP), nucleic acid-binding proteins, the CspA family proteins have received the most attention. The isocitrate dehydrogenase (ICDH) isozymes produced by strain ABE-1 (now classified as C. maris) are particularly fascinating examples of psychrophile enzyme adaptation to low temperature. A major breakthrough in studies of the molecular basis of high-pressure adaptation has been the recent report of the complete SS9 genome sequence. V. cholerae preferentially transports glutamate at high osmolarity. Under conditions of external proline, osmotic adaptation in V. vulnificus follows the osmotic induction of proline transport and its conversion to glutamate. In response to starvation conditions at low temperature many bacteria enter into a physiological state in which they cannot be propagated on culture media but remain metabolically active. Such cells have been referred to as having entered the viable but nonculturable (VBNC) state.
Full text loading...
Growth characteristics of the P. profundum strain SS9 fabB (β-ketoacyl-acyl carrier protein synthase I) mutant at low pressure (0.1 MPa, 9°C) and high pressure (28 MPa, 9°C) compared with the parental SS9R strain. Tween 80 (18:1) was supplemented at a final concentration of 0.025% (vol/vol) (E. E. Allen and D. H. Bartlett, unpublished results).
Psychrotolerant or psychrophylic members of the Vibrionaceae
Examples of enzymes from cold-adapted Vibrio species that have been studied