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#phosphate metabolism

2 public questions tagged with this topic.

Microbial Physiology

Which bacterial enzyme is involved in hydrolyzing organic phosphate esters during phosphate starvation?

Phosphate is often limiting nutrient in natural environments such as soils, freshwater lakes and host tissues, triggering broad starvation response orchestrated by Pho regulon controlled by two-component sensor kinase response regulator PhoR-PhoB. Under phosphate starvation where intracellular orthophosphate falls below micromolar threshold, bacteria induce high-affinity scavenging enzymes to liberate inorganic phosphate from organic sources. Alkaline phosphatase encoded by phoA in Escherichia coli is a periplasmic nonspecific phosphomonoesterase that hydrolyzes phosphoester bonds in diverse s

Ref: Madigan et al., Brock Biology of Microorganisms, 16th ed., Chapter 7: Pho Regulon and Alkaline Phosphatase Function.

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Radioisopes and Field Biology methods

Which isotope is best for studying phosphate metabolism?

Phosphorus is central to nucleic acids, ATP, and phospholipids, so tracking its movement requires an isotope of the same element. Phosphorus-32 is a radioactive phosphor that chemically behaves identically to stable phosphorus but emits high-energy beta particles detectable by counters and autoradiography. Incorporated into phosphate pools, it labels DNA, RNA, and phosphorylated intermediates, allowing measurement of uptake, transport, and turnover. Carbon-14 labels carbon skeletons and iodine isotopes label proteins, making phosphorus-32 uniquely suited for specifically following phosphate me

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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