Characterization of Trypanosoma brucei pyridoxal kinase: Purification, gene isolation and expression in Escherichia coli

Teddy C. Scott, Margaret A. Phillips

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Pyridoxal kinase catalyzes the ATP-dependent phosphorylation of vitamin B6, generating pyridoxal-5'-phosphate, an important cofactor for many enzymatic reactions. Pyridoxal kinase was purified 4300-fold to homogeneity from Trypanosoma brucei and peptides generated by proteolysis were subjected to amino acid sequence analysis. The peptide sequence information was used to generate a partial clone of T. brucei pyridoxal kinase by polymerase chain reaction (PCR), which in turn was used to screen a T. brucei genomic library for a full length clone. The 903-bp gene was sequenced and found to encode a 300-amino acid protein. The deduced amino acid sequence contains all of the peptide sequences obtained from the proteolytic cleavage of the native enzyme and shares 28% sequence identity with a putative Escherichia coli pyridoxal kinase, identified for its ability to compliment pyridoxal kinase deficient cells. The T. brucei pyridoxal kinase gene was expressed in E. coli and the purified enzyme was found to have pyridoxal kinase activity, confirming that this gene encodes the functional T. brucei enzyme. Native and recombinant pyridoxal kinase have a monomer molecular weight of 37 kDa by SDS- polyacrylamide gel electrophoresis (SDS-PAGE) and are dimers in solution. Native T. brucei pyridoxal kinase catalyzes the phosphorylation of pyridoxal with a specific activity of 990 nmol min-1 per mg and apparent K(m) values for pyridoxal and ATP of 22 and 9 μM, respectively. Substrate inhibition is observed for pyridoxal. Similar results were obtained for the recombinant enzyme.

Original languageEnglish (US)
Pages (from-to)1-11
Number of pages11
JournalMolecular and Biochemical Parasitology
Volume88
Issue number1-2
DOIs
StatePublished - Sep 1997

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Pyridoxal Kinase
Trypanosoma brucei brucei
Escherichia coli
Gene Expression
Pyridoxal
Enzymes
Peptides
Clone Cells
Adenosine Triphosphate
Phosphorylation
Genes
Vitamin B 6
Pyridoxal Phosphate
Genomic Library
Protein Sequence Analysis
Proteolysis
Polyacrylamide Gel Electrophoresis
Amino Acid Sequence
Molecular Weight

Keywords

  • E. coli
  • Gene isolation
  • Pyridoxal kinase
  • T. brucei

ASJC Scopus subject areas

  • Molecular Biology
  • Parasitology

Cite this

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title = "Characterization of Trypanosoma brucei pyridoxal kinase: Purification, gene isolation and expression in Escherichia coli",
abstract = "Pyridoxal kinase catalyzes the ATP-dependent phosphorylation of vitamin B6, generating pyridoxal-5'-phosphate, an important cofactor for many enzymatic reactions. Pyridoxal kinase was purified 4300-fold to homogeneity from Trypanosoma brucei and peptides generated by proteolysis were subjected to amino acid sequence analysis. The peptide sequence information was used to generate a partial clone of T. brucei pyridoxal kinase by polymerase chain reaction (PCR), which in turn was used to screen a T. brucei genomic library for a full length clone. The 903-bp gene was sequenced and found to encode a 300-amino acid protein. The deduced amino acid sequence contains all of the peptide sequences obtained from the proteolytic cleavage of the native enzyme and shares 28{\%} sequence identity with a putative Escherichia coli pyridoxal kinase, identified for its ability to compliment pyridoxal kinase deficient cells. The T. brucei pyridoxal kinase gene was expressed in E. coli and the purified enzyme was found to have pyridoxal kinase activity, confirming that this gene encodes the functional T. brucei enzyme. Native and recombinant pyridoxal kinase have a monomer molecular weight of 37 kDa by SDS- polyacrylamide gel electrophoresis (SDS-PAGE) and are dimers in solution. Native T. brucei pyridoxal kinase catalyzes the phosphorylation of pyridoxal with a specific activity of 990 nmol min-1 per mg and apparent K(m) values for pyridoxal and ATP of 22 and 9 μM, respectively. Substrate inhibition is observed for pyridoxal. Similar results were obtained for the recombinant enzyme.",
keywords = "E. coli, Gene isolation, Pyridoxal kinase, T. brucei",
author = "Scott, {Teddy C.} and Phillips, {Margaret A.}",
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T1 - Characterization of Trypanosoma brucei pyridoxal kinase

T2 - Purification, gene isolation and expression in Escherichia coli

AU - Scott, Teddy C.

AU - Phillips, Margaret A.

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N2 - Pyridoxal kinase catalyzes the ATP-dependent phosphorylation of vitamin B6, generating pyridoxal-5'-phosphate, an important cofactor for many enzymatic reactions. Pyridoxal kinase was purified 4300-fold to homogeneity from Trypanosoma brucei and peptides generated by proteolysis were subjected to amino acid sequence analysis. The peptide sequence information was used to generate a partial clone of T. brucei pyridoxal kinase by polymerase chain reaction (PCR), which in turn was used to screen a T. brucei genomic library for a full length clone. The 903-bp gene was sequenced and found to encode a 300-amino acid protein. The deduced amino acid sequence contains all of the peptide sequences obtained from the proteolytic cleavage of the native enzyme and shares 28% sequence identity with a putative Escherichia coli pyridoxal kinase, identified for its ability to compliment pyridoxal kinase deficient cells. The T. brucei pyridoxal kinase gene was expressed in E. coli and the purified enzyme was found to have pyridoxal kinase activity, confirming that this gene encodes the functional T. brucei enzyme. Native and recombinant pyridoxal kinase have a monomer molecular weight of 37 kDa by SDS- polyacrylamide gel electrophoresis (SDS-PAGE) and are dimers in solution. Native T. brucei pyridoxal kinase catalyzes the phosphorylation of pyridoxal with a specific activity of 990 nmol min-1 per mg and apparent K(m) values for pyridoxal and ATP of 22 and 9 μM, respectively. Substrate inhibition is observed for pyridoxal. Similar results were obtained for the recombinant enzyme.

AB - Pyridoxal kinase catalyzes the ATP-dependent phosphorylation of vitamin B6, generating pyridoxal-5'-phosphate, an important cofactor for many enzymatic reactions. Pyridoxal kinase was purified 4300-fold to homogeneity from Trypanosoma brucei and peptides generated by proteolysis were subjected to amino acid sequence analysis. The peptide sequence information was used to generate a partial clone of T. brucei pyridoxal kinase by polymerase chain reaction (PCR), which in turn was used to screen a T. brucei genomic library for a full length clone. The 903-bp gene was sequenced and found to encode a 300-amino acid protein. The deduced amino acid sequence contains all of the peptide sequences obtained from the proteolytic cleavage of the native enzyme and shares 28% sequence identity with a putative Escherichia coli pyridoxal kinase, identified for its ability to compliment pyridoxal kinase deficient cells. The T. brucei pyridoxal kinase gene was expressed in E. coli and the purified enzyme was found to have pyridoxal kinase activity, confirming that this gene encodes the functional T. brucei enzyme. Native and recombinant pyridoxal kinase have a monomer molecular weight of 37 kDa by SDS- polyacrylamide gel electrophoresis (SDS-PAGE) and are dimers in solution. Native T. brucei pyridoxal kinase catalyzes the phosphorylation of pyridoxal with a specific activity of 990 nmol min-1 per mg and apparent K(m) values for pyridoxal and ATP of 22 and 9 μM, respectively. Substrate inhibition is observed for pyridoxal. Similar results were obtained for the recombinant enzyme.

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