yjbM Antibody
Description
Definition and Biological Context
The yjbM antibody detects the YjbM enzyme (Bacillus subtilis), which synthesizes guanosine tetraphosphate (ppGpp) and pentaphosphate (pppGpp)—key signaling molecules in bacterial stringent responses . YjbM operates alongside RelA and YwaC in maintaining basal (p)ppGpp levels, influencing GTP homeostasis and ribosome dimerization .
Functional Role of YjbM in Bacterial Systems
YjbM contributes to:
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Basal (p)ppGpp production: Sustains low-level alarmone synthesis under non-stress conditions .
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Growth regulation: Overexpression in B. subtilis triple mutants (ΔrelA ΔyjbM ΔywaC) slows proliferation, indicating toxicity at elevated levels .
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Transcriptional control: Indirectly activates σ<sup>H</sup>-dependent genes like yvyD, critical for ribosome stability .
Table 1: YjbM Expression and Phenotypic Effects in B. subtilis
Table 2: Cross-Species Functional Studies
| Organism | Experimental System | Outcome |
|---|---|---|
| Drosophila | Heat shock-induced yjbM | Lethality post-induction |
| Human cells | Heterologous expression | ppGpp detected via chromatography |
Antibody Applications and Technical Notes
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Western blot validation: Used to confirm YjbM expression in B. subtilis strains, revealing constitutive synthesis in wild-type cells and IPTG-induced expression in mutants .
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Functional assays: Correlates YjbM levels with (p)ppGpp-mediated phenotypes, such as GTP depletion and ribosomal dimerization .
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Limitations: Low endogenous YjbM levels in wild-type cells complicate detection without induction .
Implications for Antimicrobial Research
YjbM’s role in bacterial stress adaptation highlights its potential as a therapeutic target. Inhibiting YjbM could disrupt ppGpp signaling, sensitizing pathogens to environmental stressors .
Product Specs
Constituents: 50% Glycerol, 0.01M Phosphate Buffered Saline (PBS), pH 7.4
