Difference between revisions of "Cellular Signaling Systems"

From GcatWiki
Jump to: navigation, search
 
(No difference)

Latest revision as of 14:42, 28 October 2008

Las/Rhl cell signaling system

Responsible: Robert Cool, Alicia Allen, and Erin Feeney

Las System

Signal Molecule: An AHL called PAI-1 (N-3-oxododecanoyl-l-hsl)(3-oxo-C12-hsl)

Bacterial species: Pseudomonas aeruginosa gram(-) possibly E.coli (see article 3)

Receiver protein: LasR

Effect of binding: TXN activation of virulence genes, lasA, lasB, apr, toxR

Synthase: LasI enzyme

Target Genes: lasI, lasA, lasB, apr, toxR

Regulation: unknown


References

"Roles of Pseudomonas aeruginosa las and rhl quorum-sensing systems in control of elastase and rhamnolipid biosynthesis genes"

JP Pearson, EC Pesci and BH Iglewski [1]


"Regulation of Pseudomonas Quinolone Signal Synthesis in Pseudomonas aeruginosa"

Dana S. Wade, M. Worth Calfee, Edson R. Rocha, Elizabeth A. Ling, Elana Engstrom, James P. Coleman, and Everett C. Pesci 2


Posttranscriptional Control of Quorum-Sensing-Dependent Virulence Genes by DksA in Pseudomonas aeruginosa

Florence Jude,Thilo Köhler,Pavel Branny,Karl Perron,Matthias P. Mayer,Rachel Comte, and Christian van Delden 3

Pending: [2]

Rhl System


Signal Molecule: An AHL called PAI-2, Plasminogen activator inhibitor-2, N-butanoyl-homoserine lactone (C4HSL)

Bacterial species: Pseudomonas aeruginosa, gram(-)

Receiver Protein: Rhl R

Effect of Binding: activation of Rhamnosyl Transferase, then making RL (rhamnolipid)

Synthase: RhlA and RhlB

Target Genes: pqsABCDE and phnAB

Regulation: unknown

References

background information on Las and Rhl

Las rhl.gif

Parts Needed:

LasR + pro/term

RhlR + pro/term

RhlI + pro/term

pqsABCDE + pro/term

pqsR

pqsH + pro/term

phnAB

LasI

RBS

Lux cell signaling system

Responsible: Andrew Gordon and Pallavi Penumetcha

Signal molecule: N-acyl-homoserine lactone (AHL) Generic term for a variety of species specific hormone-like molecules

Bacterial species: discovered in Vibrio fischeri known to work in E. coli

Receiver protein: LuxR protein receives signal from AHL; also has some control over transciption of luciferase

Signal molecule synthase: LuxI; also has some control over transciption of luciferase

Additional Information: "Quorum Quenching" aiiA (intracellular) lactonase reduces AHL concentration

800px-Luxrreceiverschematic.png

Resources

Lux Operon Pathway

AHL signaling molecules by species; some are specific to gram pos but may affect gram negs

Reducing Crosstalk in Lux System

References

Quorum Quenching to control Lux Pathway

[3] A Synthetic multicellular system for programmed pattern formation

Parts Needed:

LuxR + pro/term

RBS

LuxI + pro/term

LuxI sender