Abstract:
:By searching the zebrafish expressed sequence tag (EST) database, we have identified a cDNA clone encoding a putative zebrafish cytosolic sulfotransferase (ST). This cDNA was isolated and subjected to nucleotide sequencing. Analysis of the sequence data revealed that this novel zebrafish ST displays 32-35% amino acid sequence identity to members of all major cytosolic ST gene families. Therefore, this zebrafish ST, while belonging to the cytosolic ST gene superfamily, appears to be independent from all known constituent ST gene families. Recombinant zebrafish ST, expressed using the pET23c prokaryotic expression vector and purified from transformed Escherichia coli cells, migrated as a 34-kDa protein upon sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Purified zebrafish ST displayed sulfating activities toward dopamine and thyroid hormones (T(3) and T(4)), with a pH optimum spanning 7-9. The enzyme also exhibited activities toward a number of xenobiotics including some flavonoids, isoflavonoids, and other phenolic compounds. A thermostability experiment revealed the enzyme to be relatively stable over a temperature range between 20 and 48 degrees C. Among 10 divalent metal cations tested, Fe(++), Hg(++), Co(++), Zn(++), Cu(++), and Cd(++) exhibited dramatic inhibitory effects on the activity of the enzyme. These results constitute a first study on the cloning, expression, and characterization of a zebrafish cytosolic ST.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Sugahara T,Liu CC,Govind Pai T,Liu MCdoi
10.1016/s0006-291x(02)02915-7subject
Has Abstractpub_date
2003-01-17 00:00:00pages
725-30issue
3eissn
0006-291Xissn
1090-2104pii
S0006291X02029157journal_volume
300pub_type
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