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Purification and characterization of specific 3-deoxy-D-manno-octulosonate 8-phosphate phosphatase from Escherichia coli B.

Abstract：

:A phosphatase specific for the hydrolysis of 3-deoxy-d-manno-octulosonate (KDO)-8-phosphate was purified approximately 400-fold from crude extracts of Escherichia coli B. The hydrolysis of KDO-8-phosphate to KDO and inorganic phosphate in crude extracts of E. coli B, grown in phosphate-containing minimal medium, could be accounted for by the enzymatic activity of this specific phosphatase. No other sugar phosphate tested was an alternate substrate or inhibitor of the purified enzyme. KDO-8-phosphate phosphatase was stimulated three- to fourfold by the addition of 1.0 mM Co(+) or Mg(2+) and to a lesser extent by 1.0 mM Ba(2+), Zn(2+), and Mn(2+). The activity was inhibited by the addition of 1.0 mM ethylenediaminetetraacetic acid, Cu(2+), Ca(2+), Cd(2+), Hg(2+), and chloride ions (50% at 0.1 M). The pH optimum was determined to be 5.5 to 6.5 in both tris(hydroxymethyl)aminomethane-acetate and HEPES (N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid) buffer. This specific phosphatase had an isoelectric point of 4.7 to 4.8 and a molecular weight of 80,000 +/- 6,000 as determined by molecular sieving and Ferguson analysis. The enzyme appeared to be composed of two identical subunits of 40,000 to 43,000 molecular weight. The apparent K(m) for KDO-8-phosphate was determined to be 5.8 +/- 0.9 x 10(-5) M in the presence of 1.0 mM Co(2+), 9.1 +/- 1 x 10(-5) M in the presence of 1.0 mM Mg(2+), and 1.0 +/- 0.2 x 10(-4) M in the absence of added Co(2+) or Mg(2+).

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Ray PH,Benedict CD

doi

10.1128/JB.142.1.60-68.1980

subject

Has Abstract

pub_date

1980-04-01 00:00:00

pages

60-8

issue

1

eissn

0021-9193

issn

1098-5530

journal_volume

142

pub_type

杂志文章

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