Characterization and partial amino acid sequence of human plasma glutathione peroxidase.

Abstract:

:Human plasma glutathione peroxidase was purified to homogeneity and partially sequenced. Overlapping peptide fragments from three endopeptidase digests permitted the determination of one sequence of 32 contiguous amino acids and one sequence of 23 contiguous amino acids. Five additional unique peptide sequences without obvious overlaps were obtained. The sequence of 32 amino acid residues aligns with positions 82-113 of human cytosolic glutathione peroxidase with nine mismatches without gaps or insertions. The sequence of 23 amino acid residues aligns with positions 157-178 with six mismatches and an insertion of one residue. Three additional peptide sequences with no obvious sequence homology to glutathione peroxidase can be aligned based on the sequence of a cDNA clone encoding plasma glutathione peroxidase that was isolated from a human placental library. The plasma enzyme is a homotetramer composed of 21-kDa subunits which cannot reduce phospholipid hydroperoxides. These results indicate that the plasma glutathione peroxidase is distinct from both the classical cytosolic enzyme and the monomeric phospholipid hydroperoxide glutathione peroxidase. Only a negligible amount of glutathione peroxidase activity was detected in bile, indicating that the liver exports plasma glutathione peroxidase exclusively to the circulation.

journal_name

Arch Biochem Biophys

authors

Esworthy RS,Chu FF,Paxton RJ,Akman S,Doroshow JH

doi

10.1016/0003-9861(91)90048-n

subject

Has Abstract

pub_date

1991-05-01 00:00:00

pages

330-6

issue

2

eissn

0003-9861

issn

1096-0384

pii

0003-9861(91)90048-N

journal_volume

286

pub_type

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