Transition of ovalbumin to thermostable structure entails conformational changes involving the reactive center loop

Hiroshi Shinohara, Masahisa Horiuchi, Mamoru Sato, Junichi Kurisaki, Takahiro Kusakabe, Katsumi Koga, Yuji Minami, Takayoshi Aoki, Ikunosin Kato, Yasushi Sugimoto

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Ovalbumin is a serpin without inhibitory activity against proteases. During embryonic development, ovalbumin in the native (N) form undergoes changes and takes a heat-stable form, which was previously named HS-ovalbumin. It has been known that N-ovalbumin is artificially converted to another thermostable form called S-ovalbumin by heating at an alkaline pH. Here, we characterized further the three ovalbumin forms, N, HS, and S. The epitope of the monoclonal antibody 2B3/2H11, which recognizes N- and HS-ovalbumin but not S-ovalbumin, was found to reside in the region Glu-Val-Val-Gly-Ala-Ser-Glu-Ala-Gly-Val-Asp-Ala-Ala-Ser-Val-Ser-Glu-Glu-Phe-Arg, which corresponds to 340-359 of amino acid residues and is contained in the reactive center loop (RCL). Removal of RCL by elastase or subtilisin mitigated binding of the antibody. Dephosphorylation experiments indicated that the phosphorylated Ser-344 residue located on RCL is crucial for the epitope recognition. We suggest that the shift to the heat-stable form of ovalbumin accompanies a movement of RCL.

Original languageEnglish
Pages (from-to)5-11
Number of pages7
JournalBiochimica et Biophysica Acta - General Subjects
Volume1770
Issue number1
DOIs
Publication statusPublished - Jan 1 2007

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology

Fingerprint Dive into the research topics of 'Transition of ovalbumin to thermostable structure entails conformational changes involving the reactive center loop'. Together they form a unique fingerprint.

  • Cite this