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The Biochemical journal1950; 47(5); 518-525; doi: 10.1042/bj0470518

The esterases of horse blood; the specificity of horse plasma cholinesterase and ali-esterase.

Abstract: The research article delves into the exploration of the specificity of esterases in horse blood, particularly plasma cholinesterase and the ali-esterase, drawing a clear distinction between the two, which had […]
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Publication Date: 1950-11-01 PubMed ID: 14800964PubMed Central: PMC1275261DOI: 10.1042/bj0470518Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research article delves into the exploration of the specificity of esterases in horse blood, particularly plasma cholinesterase and the ali-esterase, drawing a clear distinction between the two, which had previously been muddled resulting in misleading research results. The study also establishes the names aceto-cholinesterases and butyro-cholinesterases for cholinesterases exhibiting similar specificity patterns as that found in human erythrocyte and plasma cholinesterases respectively.

Esterases Specificity in Horse Blood

  • The research focuses on the analysis of the cholinesterases of horse blood. Cholinesterase plays a vital biochemical role in the termination of impulse transmissions at cholinergic synapses by rapid hydrolysis of the neurotransmitter acetylcholine.
  • Previous studies had established that the cholinesterases of human erythrocytes, pigeon brain and human plasma can hydrolyse a variety of simple aliphatic esters.
  • The group of aliphatic esters most rapidly hydrolysed bear a resemblance to the 3:3-dimethylbutanol, an uncharged carbon analogue of choline.
  • The effect of the acyl group, however, depends on the type of cholinesterase. For instance, acetate is the optimal group for erythrocyte and brain cholinesterases, while butyrate suits the plasma cholinesterase.

Proposed Nomenclature

  • This difference between types of cholinesterases leads to the proposition of a new nomenclature that isn’t dependent on the relative specifity or assumed physiological function, or it’s lack thereof.
  • Those cholinesterases similar to human erythrocyte and pigeon-brain cholinesterases in specificity pattern were classified as acetate-cholinesterases or aceto-cholinesterases.
  • Those similar to the plasma cholinesterase in the human body were labeled as butyrate- or butyro-cholinesterases.

Studies on Horse Blood and Delineation of Esterases

  • Horse blood was examined for the types of cholinesterase it contains. The researchers scrutinized the specificity of the cholinesterases of horse blood and also explored the specificity of the aliphatic esterase, ali-esterase, in the horse serum with an aim to distinguish these two types of esterase more precisely.
  • Previous studies using horse serum to study cholinesterase sometimes led to misleading results due the presence of other esterases attacking aliphatic esters.
  • This work contributes to rectifying that problem by clearly outlining the specificities of the various cholinesterases as well as the ali-esterase.

Cite This Article

APA
STURGE LM, WHITTAKER VP. (1950). The esterases of horse blood; the specificity of horse plasma cholinesterase and ali-esterase. Biochem J, 47(5), 518-525. https://doi.org/10.1042/bj0470518

Publication

The Biochemical journal
ISSN: 1470-8728
NlmUniqueID: 2984726R
Country: England
Language: English
Volume: 47
Issue: 5
Pages: 518-525

Researcher Affiliations

STURGE, L M
    WHITTAKER, V P

      MeSH Terms

      • Animals
      • Carboxylesterase
      • Cholinesterases
      • Esterases
      • Horses
      • Humans
      • Plasma
      • Sensitivity and Specificity

      References

      This article includes 7 references
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      This article has been cited 19 times.
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