scholarly journals Genome Sequence of Flavobacteriaceae Strain W22, Isolated from a Tree Hole Mosquito Habitat

2020 ◽  
Vol 9 (7) ◽  
Author(s):  
Shicheng Chen ◽  
Edward D. Walker
Keyword(s):  
Protein Secretion ◽  
Draft Genome ◽  
Larval Habitat ◽  
Secretion System ◽  
Gliding Motility ◽  
Content Type ◽  
Polysaccharide Degradation ◽  
Tree Hole ◽  
Genes Encoding ◽  
Protein Secretion System

The bacterium Flavobacteriaceae strain W22 was isolated from the water column of a tree hole larval habitat of the mosquito Aedes triseriatus. The draft genome contained 3,796,379 bp, a G+C content of 35.4%, and several genes encoding enzymes functioning in polysaccharide degradation, gliding motility, and the type IX protein secretion system (T9SS).

scholarly journals Untangling Flavobacterium johnsoniae Gliding Motility and Protein Secretion

2017 ◽  
Vol 200 (2) ◽  
Author(s):  
Joseph J. Johnston ◽  
Abhishek Shrivastava ◽  
Mark J. McBride
Keyword(s):  
Amino Acids ◽  
Protein Secretion ◽  
Secretion System ◽  
Gliding Motility ◽  
Content Type ◽  
Flavobacterium Johnsoniae ◽  
C Terminus ◽  
Genes Encoding ◽  
Surface Localization ◽  
Protein Secretion System

ABSTRACTFlavobacterium johnsoniaeexhibits rapid gliding motility over surfaces. At least 20 genes are involved in this process. Seven of these,gldK,gldL,gldM,gldN,sprA,sprE, andsprT, encode proteins of the type IX protein secretion system (T9SS). The T9SS is required for surface localization of the motility adhesins SprB and RemA, and for secretion of the soluble chitinase ChiA. Here, we demonstrate that the gliding motility proteins GldA, GldB, GldD, GldF, GldH, GldI, and GldJ are also essential for secretion. Cells with mutations in the genes encoding any of these seven proteins had normal levels ofgldKmRNA but dramatically reduced levels of the GldK protein, which may explain the secretion defects of the motility mutants. GldJ is necessary for stable accumulation of GldK, and each mutant lacked the GldJ protein.F. johnsoniaecells that produced truncated GldJ, lacking eight to 13 amino acids from the C terminus, accumulated GldK but were deficient in gliding motility. SprB was secreted by these cells but was not propelled along their surfaces. This C-terminal region of GldJ is thus required for gliding motility but not for secretion. The identification of mutants that are defective for motility but competent for secretion begins to untangle theF. johnsoniaegliding motility machinery from the T9SS.IMPORTANCEMany members of the phylumBacteroidetessecrete proteins using T9SSs. T9SSs appear to be confined to members of this phylum. Many of these bacteria also glide rapidly over surfaces using a motility machine that is also confined to theBacteroidetesand appears to be intertwined with the T9SS. This study identifiesF. johnsoniaeproteins that are required for both T9SS function and gliding motility. It also provides an explanation for the link between secretion and gliding and identifies mutants with defects in motility but not secretion.

scholarly journals Gliding Motility and Por Secretion System Genes Are Widespread among Members of the Phylum Bacteroidetes

2012 ◽  
Vol 195 (2) ◽  
pp. 270-278 ◽  
Author(s):  
Mark J. McBride ◽  
Yongtao Zhu
Keyword(s):  
Protein Secretion ◽  
Secretion System ◽  
Gliding Motility ◽  
Secretion Systems ◽  
Content Type ◽  
Flavobacterium Johnsoniae ◽  
Protein Secretion System ◽  
Gliding Bacterium ◽  
Protein Secretion Systems ◽  
Bacterial Secretion

ABSTRACTThe phylumBacteroidetesis large and diverse, with rapid gliding motility and the ability to digest macromolecules associated with many genera and species. Recently, a novel protein secretion system, the Por secretion system (PorSS), was identified in two members of the phylum, the gliding bacteriumFlavobacterium johnsoniaeand the nonmotile oral pathogenPorphyromonas gingivalis. The components of the PorSS are not similar in sequence to those of other well-studied bacterial secretion systems. TheF. johnsoniaePorSS genes are a subset of the gliding motility genes, suggesting a role for the secretion system in motility. TheF. johnsoniaePorSS is needed for assembly of the gliding motility apparatus and for secretion of a chitinase, and theP. gingivalisPorSS is involved in secretion of gingipain protease virulence factors. Comparative analysis of 37 genomes of members of the phylumBacteroidetesrevealed the widespread occurrence of gliding motility genes and PorSS genes. Genes associated with other bacterial protein secretion systems were less common. The results suggest that gliding motility is more common than previously reported. Microscopic observations confirmed that organisms previously described as nonmotile, includingCroceibacter atlanticus, “Gramella forsetii,”Paludibacter propionicigenes,Riemerella anatipestifer, andRobiginitalea biformata, exhibit gliding motility. Three genes (gldA,gldF, andgldG) that encode an apparent ATP-binding cassette transporter required forF. johnsoniaegliding were absent from two related gliding bacteria, suggesting that the transporter may not be central to gliding motility.

scholarly journals SepD/SepL-Dependent Secretion Signals of the Type III Secretion System Translocator Proteins in Enteropathogenic Escherichia coli

2015 ◽  
Vol 197 (7) ◽  
pp. 1263-1275 ◽  
Author(s):  
Wanyin Deng ◽  
Hong B. Yu ◽  
Yuling Li ◽  
B. Brett Finlay
Keyword(s):  
Escherichia Coli ◽  
Protein Secretion ◽  
Type Iii Secretion ◽  
Bacterial Pathogens ◽  
Secretion System ◽  
Content Type ◽  
Type Iii ◽  
Secretion Signal ◽  
Protein Secretion System ◽  
Type Iii Protein Secretion

ABSTRACTThe type III protein secretion system (T3SS) encoded by the locus of enterocyte effacement (LEE) is essential for the pathogenesis of attaching/effacing bacterial pathogens, including enteropathogenicEscherichia coli(EPEC), enterohemorrhagicE. coli(EHEC), andCitrobacter rodentium. These pathogens use the T3SS to sequentially secrete three categories of proteins: the T3SS needle and inner rod protein components; the EspA, EspB, and EspD translocators; and many LEE- and non-LEE-encoded effectors. SepD and SepL are essential for translocator secretion, and mutations in either lead to hypersecretion of effectors. However, how SepD and SepL control translocator secretion and secretion hierarchy between translocators and effectors is poorly understood. In this report, we show that the secreted T3SS components, the translocators, and both LEE- and non-LEE-encoded effectors all carry N-terminal type III secretion and translocation signals. These signals all behave like those of the effectors and are sufficient for mediating type III secretion and translocation by wild-type EPEC and hypersecretion by thesepDandsepLmutants. Our results extended previous observations and suggest that the secretion hierarchy of the different substrates is determined by a signal other than the N-terminal secretion signal. We identified a domain located immediately downstream of the N-terminal secretion signal in the translocator EspB that is required for SepD/SepL-dependent secretion. We further demonstrated that this EspB domain confers SepD/SepL- and CesAB-dependent secretion on the secretion signal of effector EspZ. Our results thus suggest that SepD and SepL control and regulate secretion hierarchy between translocators and effectors by recognizing translocator-specific export signals.IMPORTANCEMany bacterial pathogens use a syringe-like protein secretion apparatus, termed the type III protein secretion system (T3SS), to secrete and inject numerous proteins directly into the host cells to cause disease. The secreted proteins perform different functions at various stages during infection and are classified into three substrate categories (T3SS components, translocators, and effectors). They all contain secretion signals at their N termini, but how their secretion hierarchy is determined is poorly understood. Here, we show that the N-terminal secretion signals from different substrate categories all behave the same and do not confer substrate specificity. We further characterize the secretion signals of the translocators and identify a translocator-specific signal, demonstrating that substrate-specific secretion signals are required in regulating T3SS substrate hierarchy.

scholarly journals Flavobacterium johnsoniae PorV Is Required for Secretion of a Subset of Proteins Targeted to the Type IX Secretion System

2014 ◽  
Vol 197 (1) ◽  
pp. 147-158 ◽  
Author(s):  
Sampada S. Kharade ◽  
Mark J. McBride
Keyword(s):  
Cell Surface ◽  
Secretion System ◽  
Gliding Motility ◽  
Content Type ◽  
Flavobacterium Johnsoniae ◽  
Protein Secretion System ◽  
Surface Motility ◽  
Type Ix Secretion System ◽  
Carboxy Terminal ◽  
Novel Protein

Flavobacterium johnsoniaeexhibits gliding motility and digests many polysaccharides, including chitin. A novel protein secretion system, the type IX secretion system (T9SS), is required for gliding and chitin utilization. The T9SS secretes the cell surface motility adhesins SprB and RemA and the chitinase ChiA. Proteins involved in secretion by the T9SS include GldK, GldL, GldM, GldN, SprA, SprE, and SprT.Porphyromonas gingivalishas orthologs for each of these that are required for secretion of gingipain protease virulence factors by its T9SS.P. gingivalisporUandporVhave also been linked to T9SS-mediated secretion, andF. johnsoniaehas orthologs of these. Mutations inF. johnsoniaeporUandporVwere constructed to determine if they function in secretion. Cells of aporVdeletion mutant were deficient in chitin utilization and failed to secrete ChiA. They were also deficient in secretion of the motility adhesin RemA but retained the ability to secrete SprB. SprB is involved in gliding motility and is needed for formation of spreading colonies on agar, and theporVmutant exhibited gliding motility and formed spreading colonies. However, theporVmutant was partially deficient in attachment to glass, apparently because of the absence of RemA and other adhesins on the cell surface. TheporVmutant also appeared to be deficient in secretion of numerous other proteins that have carboxy-terminal domains associated with targeting to the T9SS. PorU was not required for secretion of ChiA, RemA, or SprB, indicating that it does not play an essential role in theF. johnsoniaeT9SS.

scholarly journals A protein secretion system linked to bacteroidete gliding motility and pathogenesis

2009 ◽  
Vol 107 (1) ◽  
pp. 276-281 ◽  
Author(s):  
K. Sato ◽  
M. Naito ◽  
H. Yukitake ◽  
H. Hirakawa ◽  
M. Shoji ◽  
...  
Keyword(s):  
Protein Secretion ◽  
Secretion System ◽  
Gliding Motility ◽  
Protein Secretion System

scholarly journals The Type 3 Protein Secretion System of Cupriavidus taiwanensis Strain LMG19424 Compromises Symbiosis with Leucaena leucocephala

2012 ◽  
Vol 78 (20) ◽  
pp. 7476-7479 ◽  
Author(s):  
Maged M. Saad ◽  
Michèle Crèvecoeur ◽  
Catherine Masson-Boivin ◽  
Xavier Perret
Keyword(s):  
Protein Secretion ◽  
Transcriptional Activation ◽  
Leucaena Leucocephala ◽  
Secretion System ◽  
Mimosa Pudica ◽  
Chronic Infections ◽  
Content Type ◽  
Protein Secretion System ◽  
Type Iii Protein Secretion ◽  
Type 3

ABSTRACTCupriavidus taiwanensisforms proficient symbioses with a fewMimosaspecies. Inactivation of a type III protein secretion system (T3SS) had no effect onMimosa pudicabut allowedC. taiwanensisto establish chronic infections and fix nitrogen inLeucaena leucocephala. Unlike what was observed for other rhizobia, glutamate rather than plant flavonoids mediated transcriptional activation of this atypical T3SS.

scholarly journals The Carboxy-Terminal Region ofFlavobacterium johnsoniaeSprB Facilitates Its Secretion by the Type IX Secretion System and Propulsion by the Gliding Motility Machinery

2019 ◽  
Vol 201 (19) ◽  
Author(s):  
Surashree S. Kulkarni ◽  
Joseph J. Johnston ◽  
Yongtao Zhu ◽  
Zachary T. Hying ◽  
Mark J. McBride
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Cell Surface ◽  
Type A ◽  
Secretion System ◽  
Gliding Motility ◽  
Foreign Protein ◽  
Type B ◽  
Content Type ◽  
Type Ix Secretion System

ABSTRACTFlavobacterium johnsoniaeSprB moves rapidly along the cell surface, resulting in gliding motility. SprB secretion requires the type IX secretion system (T9SS). Proteins secreted by the T9SS typically have conserved C-terminal domains (CTDs) belonging to the type A CTD or type B CTD family. Attachment of 70- to 100-amino-acid type A CTDs to a foreign protein allows its secretion. Type B CTDs are common but have received little attention. Secretion of the foreign protein superfolder green fluorescent protein (sfGFP) fused to regions spanning the SprB type B CTD (sfGFP-CTDSprB) was analyzed. CTDs of 218 amino acids or longer resulted in secretion of sfGFP, whereas a 149-amino-acid region did not. Some sfGFP was secreted in soluble form, whereas the rest was attached on the cell surface. Surface-attached sfGFP was rapidly propelled along the cell, suggesting productive interaction with the motility machinery. This did not result in rapid cell movement, which apparently requires additional regions of SprB. Secretion of sfGFP-CTDSprBrequired coexpression withsprF, which lies downstream ofsprB. SprF is similar in sequence toPorphyromonas gingivalisPorP. MostF. johnsoniaegenes encoding proteins with type B CTDs lie immediately upstream ofporP/sprF-like genes. sfGFP was fused to the type B CTD from one such protein (Fjoh_3952). This resulted in secretion of sfGFP only when it was coexpressed with its cognate PorP/SprF-like protein. These results highlight the need for extended regions of type B CTDs and for coexpression with the appropriate PorP/SprF-like protein for efficient secretion and cell surface localization of cargo proteins.IMPORTANCETheF. johnsoniaegliding motility adhesin SprB is delivered to the cell surface by the type IX secretion system (T9SS) and is rapidly propelled along the cell by the motility machinery. How this 6,497-amino-acid protein interacts with the secretion and motility machines is not known. Fusion of the C-terminal 218 amino acids of SprB to a foreign cargo protein resulted in its secretion, attachment to the cell surface, and rapid movement by the motility machinery. Efficient secretion of SprB required coexpression with the outer membrane protein SprF. Secreted proteins that have sequence similarity to SprB in their C-terminal regions are common in the phylumBacteroidetesand may have roles in adhesion, motility, and virulence.

scholarly journals Draft Genome Sequences of Two Enterobacter cloacae subsp. cloacae Strains Isolated from Australian Hematology Patients with Bacteremia

2017 ◽  
Vol 5 (33) ◽  
Author(s):  
Lex E. X. Leong ◽  
David Shaw ◽  
Lito Papanicolas ◽  
Diana Lagana ◽  
Ivan Bastian ◽  
...  
Keyword(s):  
Gut Microbiota ◽  
Draft Genome ◽  
Enterobacter Cloacae ◽  
Opportunistic Pathogen ◽  
Healthy Individuals ◽  
Genome Sequences ◽  
Content Type ◽  
Extended Spectrum ◽  
Genes Encoding

ABSTRACT Enterobacter cloacae is a common member of the gut microbiota in healthy individuals. However, it is also an opportunistic pathogen, capable of causing bacteremia. We report the draft genomes of two Enterobacter cloacae subspecies cloacae strains isolated from hematology patients with bacteremia. Both isolates carry genes encoding extended-spectrum β-lactamases.

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