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. 1966 Dec;101(3):861–872. doi: 10.1042/bj1010861

Metabolism of the reserve polysaccharide of Streptococcus mitis

Properties of a transglucosylase

Gwen J Walker 1
PMCID: PMC1270195  PMID: 16742467

Abstract

1. A transglucosylase has been separated from cell extracts of Streptococcus mitis, and has been partially purified by chromatography on DEAE-cellulose. 2. The transglucosylase was present in the six strains of Streptococcus mitis that were examined, and the activity of the enzyme was the same whether the cells had grown on glucose or on maltose. Four of the strains could store intracellular iodophilic polysaccharide when grown on high concentrations of glucose or maltose (1%), but none of the strains stored polysaccharide during growth on 0·1% glucose. The activity of transglucosylase in cell extracts was the same whether or not the cells had stored polysaccharide. 3. The transglucosylase degrades amylose in the presence of a suitable acceptor, transferring one or more glucosyl residues from the non-reducing end of the donor to the non-reducing end of the acceptor. With [14C]glucose as acceptor the maltodextrins produced were labelled in the reducing glucose unit only. 4. The enzyme can synthesize higher maltodextrins from maltose and maltotriose. Maltotetraose is disproportionated to give products of sufficient chain length to give a stain with iodine. 5. The action pattern of S. mitis during the degradation of synthetic amylose was shown to be intermediate between the single-chain and multi-chain mechanism.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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