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Related Experiment Videos

A binding assay for serine hydroxymethyltransferase.

A M Geller1, M Y Kotb

  • 1Department of Biochemistry, University of Tennessee, Memphis 38163.

Analytical Biochemistry
|July 1, 1989
PubMed
Summary
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A new assay accurately measures serine hydroxymethyltransferase activity using radiolabeled tetrahydrofolate and DEAE-cellulose paper. This method simplifies enzyme activity measurement in various biological samples.

Area of Science:

  • Biochemistry
  • Enzymology

Background:

  • Serine hydroxymethyltransferase (SHMT) is a key enzyme in folate metabolism.
  • Accurate and sensitive assays are crucial for studying SHMT activity in biological systems.

Purpose of the Study:

  • To develop a novel, sensitive assay for measuring serine hydroxymethyltransferase (SHMT) activity.
  • To validate the assay's reliability and applicability for biological sample analysis.

Main Methods:

  • Development of a DEAE-cellulose paper binding assay for N5,N10-[14C]methylene tetrahydrofolate (THF).
  • Assay components include THF, pyridoxal 5'-phosphate, [14C]serine, and enzyme.
  • Reaction product quantification via paper chromatography and liquid scintillation counting.

Main Results:

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  • The assay demonstrated sensitivity and specificity for SHMT activity.
  • Product formation was directly proportional to enzyme concentration and assay duration.
  • Validation studies confirmed the assay's ability to measure SHMT activity in tissue homogenates.

Conclusions:

  • A simple, sensitive, and reliable assay for SHMT activity has been established.
  • This method facilitates enzyme activity assessment in complex biological matrices.
  • The assay is suitable for high-throughput screening of SHMT activity.