Subtopic Deep Dive
Cronobacter sakazakii Virulence Factors
Research Guide
What is Cronobacter sakazakii Virulence Factors?
Cronobacter sakazakii virulence factors are bacterial adhesins, toxins, secretion systems, and iron acquisition mechanisms enabling invasion of neonatal intestinal epithelium and blood-brain barrier crossing.
Studies identify outer membrane proteins OmpA and OmpX as essential for basolateral invasion (Kim et al., 2010, 167 citations). Genomic analysis reveals prophage-associated putative virulence genes divergent across strains (Kucerova et al., 2010, 208 citations). Infection models quantify contributions of flagella and OmpA to translocation and inflammation (Giri et al., 2011, 57 citations; Nair et al., 2009, 74 citations).
Why It Matters
OmpA binds fibronectin to invade human brain microvascular endothelial cells, contributing to neonatal meningitis (Nair et al., 2009). OmpA and OmpX mutants show reduced intestinal translocation, informing vaccine targets (Kim et al., 2010). Citral inhibits these factors, suggesting antimicrobial strategies against necrotizing enterocolitis (Shi et al., 2017). Dendritic cell recruitment by C. sakazakii damages intestinal epithelium in NEC mouse models (Emami et al., 2011).
Key Research Challenges
Quantifying individual virulence contributions
Mutagenesis of OmpA and OmpX reduces invasion, but additive effects with prophage genes remain unclear (Kim et al., 2010; Kucerova et al., 2010). Infection models vary in translocation efficiency across strains (Giri et al., 2011). Lack of standardized neonatal models hinders precise quantification.
Identifying novel genomic virulence loci
CGH identifies 15 divergent gene clusters including prophage, but functional validation is limited (Kucerova et al., 2010). Strain-specific absence of factors complicates generalization (Kim et al., 2010). Prophage origins suggest horizontal transfer challenges.
Developing targeted antivirulence therapies
Citral inhibits OmpA-mediated invasion, but in vivo efficacy and resistance emergence need testing (Shi et al., 2017). Biofilm formation by biocides affects virulence persistence (Capita et al., 2019). Oligosaccharide anti-adhesins show promise against related pathogens (Douëllou et al., 2017).
Essential Papers
Genome Sequence of Cronobacter sakazakii BAA-894 and Comparative Genomic Hybridization Analysis with Other Cronobacter Species
Eva Kucerova, Sandra W. Clifton, Xiao-Qin Xia et al. · 2010 · PLoS ONE · 208 citations
CGH highlighted 15 clusters of genes in C. sakazakii BAA-894 that were divergent or absent in more than half of the tested strains; six of these are of probable prophage origin. Putative virulence ...
Outer Membrane Proteins A (OmpA) and X (OmpX) Are Essential for Basolateral Invasion of <i>Cronobacter sakazakii</i>
Kyumson Kim, Kwang-Pyo Kim, Jeongjoon Choi et al. · 2010 · Applied and Environmental Microbiology · 167 citations
ABSTRACT Cronobacter sakazakii is an opportunistic pathogen that actively invades host eukaryotic cells. To identify invasion factors responsible for the intestinal translocation of C. sakazakii , ...
Genetic determinants of heat resistance in Escherichia coli
Ryan G. Mercer, Jinshui Zheng, Rigoberto Garcia-Hernandez et al. · 2015 · Frontiers in Microbiology · 144 citations
Escherichia coli AW1.7 is a heat resistant food isolate and the occurrence of pathogenic strains with comparable heat resistance may pose a risk to food safety. To identify the genetic determinants...
Inhibition of Cronobacter sakazakii Virulence Factors by Citral
Chao Shi, Yi Sun, Zhiyuan Liu et al. · 2017 · Scientific Reports · 84 citations
Abstract Cronobacter sakazakii is a foodborne pathogen associated with fatal forms of necrotizing enterocolitis, meningitis and sepsis in neonates and infants. The aim of this study was to determin...
Outer Membrane Protein A (OmpA) of <i>Cronobacter sakazakii</i> Binds Fibronectin and Contributes to Invasion of Human Brain Microvascular Endothelial Cells
Manoj Kumar Mohan Nair, Kumar Venkitanarayanan, Lawrence K. Silbart et al. · 2009 · Foodborne Pathogens and Disease · 74 citations
Cronobacter sakazakii is an emerging foodborne pathogen that causes severe meningitis and meningoencephalitis in neonates. Currently there is a dearth of information available on the virulence fact...
Recruitment of Dendritic Cells Is Responsible for Intestinal Epithelial Damage in the Pathogenesis of Necrotizing Enterocolitis by <i>Cronobacter sakazakii</i>
Claudia Emami, Rahul Mittal, Larry Wang et al. · 2011 · The Journal of Immunology · 59 citations
Abstract Cronobacter sakazakii is a Gram-negative pathogen associated with the cases of necrotizing enterocolitis (NEC) that result from formula contamination. In a mouse model of NEC, we demonstra...
Invited review: Anti-adhesive properties of bovine oligosaccharides and bovine milk fat globule membrane-associated glycoconjugates against bacterial food enteropathogens
Thomas Douëllou, M.C. Montel, Delphine Sergentet · 2017 · Journal of Dairy Science · 58 citations
The prevalence of the main raw milk and raw milk-derived dairy product enteropathogens (Campylobacter, Shiga toxin-producing Escherichia coli, Listeria, and Salmonella) is higher than the number of...
Reading Guide
Foundational Papers
Start with Kucerova et al. (2010) for genomic virulence clusters, then Kim et al. (2010) for OmpA/OmpX invasion essentials, Nair et al. (2009) for BBB mechanism.
Recent Advances
Shi et al. (2017) on citral inhibition; Capita et al. (2019) on biocide effects on biofilms; Douëllou et al. (2017) on anti-adhesins.
Core Methods
Mutational analysis of OM proteins, CGH hybridization, cell invasion assays, mouse NEC models, cytokine induction in macrophages.
How PapersFlow Helps You Research Cronobacter sakazakii Virulence Factors
Discover & Search
Research Agent uses citationGraph on Kucerova et al. (2010) to map prophage virulence clusters across 208 citing papers, then exaSearch for 'Cronobacter sakazakii OmpA invasion mutants' to find strain-specific invasins. findSimilarPapers expands from Kim et al. (2010) to related Enterobacteriaceae adhesins.
Analyze & Verify
Analysis Agent applies readPaperContent to Kim et al. (2010) for OmpX mutant invasion data, then runPythonAnalysis to plot basolateral invasion rates vs. wild-type using pandas; verifyResponse with CoVe cross-checks claims against Nair et al. (2009) fibronectin binding, graded by GRADE for methodological rigor.
Synthesize & Write
Synthesis Agent detects gaps in prophage virulence validation post-Kucerova et al. (2010), flags contradictions between strain invasions in Giri et al. (2011); Writing Agent uses latexEditText for virulence model diagrams, latexSyncCitations for 10-paper review, and exportMermaid for OmpA invasion pathway graphs.
Use Cases
"Compare OmpA invasion efficiency across C. sakazakii strains in brain endothelial models"
Research Agent → searchPapers('OmpA Cronobacter brain invasion') → Analysis Agent → runPythonAnalysis(pandas plot of Nair 2009 vs Giri 2011 invasion percentages) → statistical t-test output with p-values.
"Draft LaTeX review of C. sakazakii prophage virulence factors"
Synthesis Agent → gap detection on Kucerova 2010 → Writing Agent → latexEditText(structured review sections) → latexSyncCitations(15 prophage papers) → latexCompile(PDF with figures).
"Find GitHub code for Cronobacter mutagenesis analysis"
Research Agent → searchPapers('Cronobacter sakazakii OmpA mutant sequencing') → Code Discovery → paperExtractUrls → paperFindGithubRepo → githubRepoInspect(QC pipeline for Kim 2010 mutants).
Automated Workflows
Deep Research workflow scans 50+ papers via searchPapers on 'Cronobacter sakazakii virulence factors', structures report with OmpA/OmpX invasion data from Kim et al. (2010) and Nair et al. (2009). DeepScan applies 7-step CoVe to Emami et al. (2011) NEC model, verifying dendritic cell claims with GRADE B evidence. Theorizer generates hypotheses linking prophage to heat resistance from Mercer et al. (2015).
Frequently Asked Questions
What defines Cronobacter sakazakii virulence factors?
Adhesins like OmpA and OmpX, prophage genes, flagella, enabling intestinal and BBB invasion (Kim et al., 2010; Kucerova et al., 2010).
What methods study these factors?
Mutagenesis of outer membrane proteins, CGH for genomic divergence, mouse NEC models, fibronectin binding assays (Kim et al., 2010; Nair et al., 2009; Emami et al., 2011).
What are key papers?
Kucerova et al. (2010, 208 citations) on prophage virulence; Kim et al. (2010, 167 citations) on OmpA/OmpX invasion; Nair et al. (2009, 74 citations) on brain endothelial invasion.
What open problems exist?
Functional validation of prophage loci, strain variability in invasion, in vivo antivirulence compound efficacy like citral (Kucerova et al., 2010; Shi et al., 2017).
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