Rationale for reclassification of a distinctive subdivision of mammalian class Mu glutathione S-transferases that are primarily expressed in testis.

The Journal of Biological Chemistry
J D RoweI Listowsky

Abstract

A rat testicular Mu-class glutathione S-transferase (GST) resolved by reversed-phase high performance liquid chromatography cross-reacted with peptide sequence-specific antisera raised against the human hGSTM3 subunit. Electrospray ionization mass spectrometry indicated that this rat GST subunit (designated rGSTM5 in this report) has a significantly greater molecular mass (26,541 Da) than the other rat GST subunits. The mouse homologue (mGSTM5 subunit) was also identified and characterized by high performance liquid chromatography and electrospray ionization mass spectrometry. Sequence analysis of rGSTM5 peptide fragments and the sequence deduced from a cDNA clone showed that the protein is highly homologous to the hGSTM3 and murine mGSTM5 subunits. All three GSTs of this subclass have N- and C-terminal extensions with C-terminal cysteine residues, but the two penultimate amino acids near the C terminus are divergent in the three species. The proteins of this class Mu subfamily have similar catalytic specificities and mechanisms, are all cysteine rich, are found mainly in testis, and share characteristics that distinguish them from other GSTs. Moreover, the rGSTM5 subunit isolated from rat testis was not found in heterodimeric ...Continue Reading

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