Borrelia burgdorferi malQ mutants utilize disaccharides and traverse the enzootic cycle.
Borrelia burgdorferi, the causative agent of Lyme disease, cycles in nature between a vertebrate host and a tick vector. We demonstrate that B. burgdorferi can utilize several sugars that may be available during persistence in the tick, including trehalose, N-acetylglucosamine (GlcNAc), and chitobiose. The spirochete grows to a higher cell density in trehalose, which is found in tick hemolymph, than in maltose; these two disaccharides differ only in the glycosidic linkage between the glucose monomers. Additionally, B. burgdorferi grows to a higher density in GlcNAc than in the GlcNAc dimer chitobiose, both of which may be available during tick molting. We have also investigated the role of malQ (bb0166), which encodes an amylomaltase, in sugar utilization during the enzootic cycle. In other bacteria, MalQ is involved in utilizing maltodextrins and trehalose, but we show that, unexpectedly, it is not needed for B. burgdorferi to grow in vitro on any of the sugars assayed. In addition, infection of mice by needle inoculation or tick bite, as well as acquisition and maintenance of the spirochete in the tick vector, does not require MalQ.
Division of Biological Sciences, The University of Montana, Missoula, MT 59812-4824, USA.
Laura L
LL
Hoon-Hanks
Elizabeth A
EA
Morton
Meghan C
MC
Lybecker
James M
JM
Battisti
D Scott
DS
Samuels
Dan
D
Drecktrah
D000818:Animals; D025065:Borrelia burgdorferi / Q000201:enzymology* / Q000472:pathogenicity*; D004187:Disaccharides / Q000378:metabolism*; D004195:Disease Models, Animal; D005260:Female; D017353:Gene Deletion; D006004:Glycogen Debranching Enzyme System / Q000235:genetics / Q000378:metabolism*; D008193:Lyme Disease / Q000382:microbiology; D051379:Mice; D008809:Mice, Inbred C3H
D004187:Disaccharides; D006004:Glycogen Debranching Enzyme System; C020569:4 alpha-glucanotransferase