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Category: Food Microbiology; Applied and Industrial Microbiology
Yersinia enterocolitica, Page 1 of 2
< Previous page | Next page > /docserver/preview/fulltext/10.1128/9781555818463/9781555816261_Chap14-1.gif /docserver/preview/fulltext/10.1128/9781555818463/9781555816261_Chap14-2.gifAbstract:
Yersinia pestis is transmitted to its host via flea bites or respiratory aerosols, whereas Y. pseudotuberculosis and Y. enterocolitica are foodborne pathogens. These three species share a number of essential virulence determinants that enable them to overcome the innate defenses of their hosts. Given that Y. pestis is incapable of infecting the intestinal tract directly and not pathogenic when ingested and that the role of most other Yersinia species in disease is uncertain, this chapter focuses on Y. enterocolitica and Y. pseudotuberculosis. Y. pseudotuberculosis is a relatively homogenous species, which is subdivided into serotypes according to its lipopolysaccharide (LPS) O antigens. Y. enterocolitica is far more heterogenous than Y. pseudotuberculosis, being divisible into a large number of subgroups according to biochemical activity and LPS O antigens. Infection with the enteropathogenic yersiniae typically manifests as nonspecific, self-limiting diarrhea but may produce a variety of suppurative and autoimmune complications, the risk of which is determined partly by host factors, in particular age and underlying immune status. Indeed, Y. enterocolitica is one of the most important causes of fatal bacteremia following transfusion with packed red blood cells or platelets. Explanations for the link between yersiniosis and autoimmunity include antigen persistence, molecular mimicry, impaired immune responsiveness, and infection-induced presentation of normally cryptic cellular antigens.
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Transmission electron micrograph showing the initial interaction (black arrowhead) and transport (white arrow) of Y. enterocolitica through an intestinal M cell, 60 min after inoculation into mouse ileum. (Reprinted with permission from reference 111 .) doi:10.1128/9781555818463.ch14f1
Transmission electron micrograph showing the initial interaction (black arrowhead) and transport (white arrow) of Y. enterocolitica through an intestinal M cell, 60 min after inoculation into mouse ileum. (Reprinted with permission from reference 111 .) doi:10.1128/9781555818463.ch14f1
Light micrograph of a section through the colon of a gnotobiotic piglet 3 days after inoculation with a virulent strain of Y. enterocolitica O:3. Note the microabscess, comprising mostly bacteria, the surrounding inflammatory cells (arrows), and the disrupted epithelium with vacuolated and necrotic cells. Epoxy section, methylene blue stain. (Reprinted with permission from reference 308 .) doi:10.1128/9781555818463.ch14f2
Light micrograph of a section through the colon of a gnotobiotic piglet 3 days after inoculation with a virulent strain of Y. enterocolitica O:3. Note the microabscess, comprising mostly bacteria, the surrounding inflammatory cells (arrows), and the disrupted epithelium with vacuolated and necrotic cells. Epoxy section, methylene blue stain. (Reprinted with permission from reference 308 .) doi:10.1128/9781555818463.ch14f2
Amino acid sequences of the mature heat-stable enterotoxins produced by Y. enterocolitica ( 138 , 234 , 291 ), enterotoxigenic E. coli of human (STh) and porcine (STp) subtypes ( 8 , 289 ), C. freundii ( 112 ), V. cholerae non-O1 ( 290 ), and the intestinal hormone guanylin ( 68 ). Amino acid residues that are shaded are common to all seven peptides. The first 23 amino acids at the N terminus of the Yst-c mature toxin (denoted by superscript “a”) are not included in the sequence alignments. doi:10.1128/9781555818463.ch14f3
Amino acid sequences of the mature heat-stable enterotoxins produced by Y. enterocolitica ( 138 , 234 , 291 ), enterotoxigenic E. coli of human (STh) and porcine (STp) subtypes ( 8 , 289 ), C. freundii ( 112 ), V. cholerae non-O1 ( 290 ), and the intestinal hormone guanylin ( 68 ). Amino acid residues that are shaded are common to all seven peptides. The first 23 amino acids at the N terminus of the Yst-c mature toxin (denoted by superscript “a”) are not included in the sequence alignments. doi:10.1128/9781555818463.ch14f3
A representation of the HPI of Y. enterocolitica O:8 strain WA-C. Arrows indicate the positions of the open reading frames and the direction of transcription. The region that is conserved in Y. pestis and Y. pseudotuberculosis is indicated by a double-headed arrow. (Adapted from reference 231 .) doi:10.1128/9781555818463.ch14f4
A representation of the HPI of Y. enterocolitica O:8 strain WA-C. Arrows indicate the positions of the open reading frames and the direction of transcription. The region that is conserved in Y. pestis and Y. pseudotuberculosis is indicated by a double-headed arrow. (Adapted from reference 231 .) doi:10.1128/9781555818463.ch14f4
Map of the virulence plasmid pYVe of Y. enterocolitica serogroup O:9 showing the location and direction of transcription (arrows) of the genes encoding (i) YadA; (ii) YlpA; (iii) Yops B, D, E, H, M, N, O, P, Q, T, and LcrV; (iv) specific Yop chaperones Syc D, E, H, and T; (v) secretion elements VirA, -B, -C, -G; and the regulatory element VirF (adapted from reference 139 ). doi:10.1128/9781555818463.ch14f5
Map of the virulence plasmid pYVe of Y. enterocolitica serogroup O:9 showing the location and direction of transcription (arrows) of the genes encoding (i) YadA; (ii) YlpA; (iii) Yops B, D, E, H, M, N, O, P, Q, T, and LcrV; (iv) specific Yop chaperones Syc D, E, H, and T; (v) secretion elements VirA, -B, -C, -G; and the regulatory element VirF (adapted from reference 139 ). doi:10.1128/9781555818463.ch14f5
Schematic representation of Yop secretion and translocation by Y. enterocolitica. The major structural proteins of the secretory apparatus are shown in relation to their known or deduced location in the cell wall. The effector Yop chaperone (Syc) and translocation pore comprising YopB and YopD are also depicted. Not to scale. doi:10.1128/9781555818463.ch14f6
Schematic representation of Yop secretion and translocation by Y. enterocolitica. The major structural proteins of the secretory apparatus are shown in relation to their known or deduced location in the cell wall. The effector Yop chaperone (Syc) and translocation pore comprising YopB and YopD are also depicted. Not to scale. doi:10.1128/9781555818463.ch14f6
Antibody response of sheep infected with Y. enterocolitica or Y. pseudotuberculosis to Yops. Yops were prepared from Y. enterocolitica serogroup O:3, separated by polyacrylamide gel electrophoresis, transferred to a nitrocellulose membrane, and subjected to reaction with preimmune (lanes 1 and 3) or immune (lanes 2 and 4) sera from lambs with naturally acquired infection with pYV-bearing Y. enterocolitica (lanes 1 and 2) or Y. pseudotuberculosis (lanes 3 and 4). (Reprinted with permission from reference 237 .) doi:10.1128/9781555818463.ch14f7
Antibody response of sheep infected with Y. enterocolitica or Y. pseudotuberculosis to Yops. Yops were prepared from Y. enterocolitica serogroup O:3, separated by polyacrylamide gel electrophoresis, transferred to a nitrocellulose membrane, and subjected to reaction with preimmune (lanes 1 and 3) or immune (lanes 2 and 4) sera from lambs with naturally acquired infection with pYV-bearing Y. enterocolitica (lanes 1 and 2) or Y. pseudotuberculosis (lanes 3 and 4). (Reprinted with permission from reference 237 .) doi:10.1128/9781555818463.ch14f7