Preparation and partial structural characterization of α1T- glycoprotein from normal human plasma

Tomohiro Araki, Heinz Haupt, Peter Hermentin, H. Gerhard Schwick, Yoshinobu Kimura, Karl Schmid, Takao Torikata

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

α1T-glycoprotein (α1T) was isolated from normal human plasma in the immunochemically homogeneous state. The partial amino acid sequence and carbohydrate chains of this glycoprotein were determined. To achieve this, the carboxymethylated α1T was analyzed by sequencing some of the lysylendoprotease, V8 protease, tryptic, and cyanogen bromide peptides as well as the N-terminal sequence of the protein. A large number of amino acid residues (460 amino acids) was determined by chemical procedure. The peptide sequences were compared with that of other proteins. A high degree of homology was found for proteins of the albumin family. Further, human α- albumin, a new member of this protein family, showed an amino acid sequence identical to that of α1T indicating that these two proteins are very similar in amino acid sequence and composition. These proteins are closely related to α-fetoprotein; however, five carbohydrate chains were found on α1T at Asn12, Asn88, Asn362, Asn381, and Ash467 as biantennary complex type chains and the chain on Asn362 possessed a rare consensus sequence of Asn-XCys. Thus, α1T distinguishes itself by possessing five N-glycans, a finding reported here for the first time for the ALB family.

Original languageEnglish
Pages (from-to)250-256
Number of pages7
JournalArchives of Biochemistry and Biophysics
Volume351
Issue number2
DOIs
Publication statusPublished - Mar 15 1998

Keywords

  • Albumin
  • Plasma protein
  • α-albumin
  • α1T-glycoprotein

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology

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