Purification and characterization of Streptococcus sobrinus dextranase produced in recombinant Escherichia coli and sequence analysis of the dextranase gene

S. Y. Wanda, R. Curtiss

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

The plasmid (pYA902) with the dextranase (dex) gene of Streptococcus sobrinus UAB66 (serotype g) produces a C-terminal truncated dextranase enzyme (Dex) with a multicomplex mass form which ranges from 80 to 130 kDa. The Escherichia coli-produced enzyme was purified and characterized, and antibodies were raised in rabbits. Purified dextranase has a native-form molecular mass of 160 to 260 kDa and specific activity of 4,000 U/mg of protein. Potential immunological cross-reactivity between dextranase and the SpaA protein specified by various recombinant clones was studied by using various antisera and Western blot (immunoblot) analysis. No cross-reactivity was observed. Optimal pH (5.3) and temperature (39°C) and the isoelectric points (3.56, 3.6, and 3.7) were determined and found to be similar to those for dextranase purified from S. sobrinus. The dex DNA restriction map was determined, and several subclones were obtained. The nucleotide sequence of the dex gene was determined by using subclones pYA993 and pYA3009 and UAB66 chromosomal DNA. The open reading frame for dex was 4,011 bp, ending with a stop codon TAA. A ribosome-binding site and putative promoter preceding the start codon were identified. The deduced amino acid sequence of Dex revealed the presence of a signal peptide of 30 amino acids. The cleavage site for the signal sequence was determined by N-terminal amino acid sequence analysis for Dex produced in E. coli (χ)2831(pYA902). The C terminus consists of a serine- and threonine-rich region followed by the peptide LPKTGD, 3 charged amino acids, 19 amino acids with a strongly hydrophobic character, and a charged pentapeptide tail, which are proposed to correspond to the cell wall- spanning region, the LPXTGX consensus sequence, and the membrane-anchoring domains of surface-associated proteins of gram-positive cocci.

Original languageEnglish (US)
Pages (from-to)3839-3850
Number of pages12
JournalJournal of Bacteriology
Volume176
Issue number13
StatePublished - 1994
Externally publishedYes

Fingerprint

Dextranase
Streptococcus sobrinus
Sequence Analysis
Escherichia coli
Genes
Protein Sorting Signals
Amino Acids
Western Blotting
Gram-Positive Cocci
Initiator Codon
Terminator Codon
DNA
Protein Sequence Analysis
Consensus Sequence
Isoelectric Point
Enzymes
Threonine
Ribosomes
Cell Wall
Serine

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology
  • Immunology

Cite this

Purification and characterization of Streptococcus sobrinus dextranase produced in recombinant Escherichia coli and sequence analysis of the dextranase gene. / Wanda, S. Y.; Curtiss, R.

In: Journal of Bacteriology, Vol. 176, No. 13, 1994, p. 3839-3850.

Research output: Contribution to journalArticle

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