Isolation and characterization of methionine synthetase from human placenta

C. S. Utley, P. D. Marcell, R. H. Allen, Asok Antony, J. F. Kolhouse

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The cobalamin-dependent enzyme, methionine synthetase, has been purified approximately 1000-fold to apparent homogeneity from human placenta with a 19% recovery. The final two steps of the purification utilized two different affinity columns. The first was a N5-methyltetrahydrofolate-cystamine-agarose column, and the second was a S-adenosylhomocysteine-agarose column. The enzyme was eluted from the first affinity column by buffer containing reducing agent which released the folate and the enzyme while elution from the second affinity column was accomplished with buffer containing 0.5 M sodium chloride. Criteria for purity were the observations that single peaks of enzyme activity, protein, and cobalamin with an apparent molecular weight of 160,000 were obtained by gel filtration and that holomethionine synthetase contained 1 mol of cobalamin/mol of protein. Furthermore, analysis by high performance liquid chromatography using a molecular weight sizing column demonstrated a single peak of protein with a corresponding cobalamin peak. This single peak of protein was progressively converted to a second protein peak that was enzymatically inactive, and this conversion was associated with a directly proportional loss of enzyme activity and cobalamin from the first peak. Methionine synthetase appeared to have a molecular weight of 160,000 on unreduced sodium dodecyl sulfate-polyacrylamide slab gel electrophoresis and subunits of M(r) 90,000, 45,000, and 35,000 on reduced sodium dodecyl sulfate-polyacrylamide slab gel electrophoresis.

Original languageEnglish (US)
Pages (from-to)13656-13665
Number of pages10
JournalJournal of Biological Chemistry
Volume260
Issue number25
StatePublished - 1985
Externally publishedYes

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5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase
Vitamin B 12
Placenta
Enzymes
Molecular Weight
Molecular weight
Enzyme activity
Proteins
Electrophoresis
Sodium Dodecyl Sulfate
Polyacrylamide Gel Electrophoresis
Buffers
S-Adenosylhomocysteine
Reducing Agents
Distillation columns
High performance liquid chromatography
Ligases
Folic Acid
Sodium Chloride
Sepharose

ASJC Scopus subject areas

  • Biochemistry

Cite this

Utley, C. S., Marcell, P. D., Allen, R. H., Antony, A., & Kolhouse, J. F. (1985). Isolation and characterization of methionine synthetase from human placenta. Journal of Biological Chemistry, 260(25), 13656-13665.

Isolation and characterization of methionine synthetase from human placenta. / Utley, C. S.; Marcell, P. D.; Allen, R. H.; Antony, Asok; Kolhouse, J. F.

In: Journal of Biological Chemistry, Vol. 260, No. 25, 1985, p. 13656-13665.

Research output: Contribution to journalArticle

Utley, CS, Marcell, PD, Allen, RH, Antony, A & Kolhouse, JF 1985, 'Isolation and characterization of methionine synthetase from human placenta', Journal of Biological Chemistry, vol. 260, no. 25, pp. 13656-13665.
Utley, C. S. ; Marcell, P. D. ; Allen, R. H. ; Antony, Asok ; Kolhouse, J. F. / Isolation and characterization of methionine synthetase from human placenta. In: Journal of Biological Chemistry. 1985 ; Vol. 260, No. 25. pp. 13656-13665.
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