Primary structure of 6.5k-arginine/glutamate-rich polypeptide from the seeds of sponge gourd (luffa cylindrica)

Makoto Kimura, Sung Soo Park, Ritsu Sakai, Nobuyuki Yamasaki, Gunki Funatsu

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The amino acid sequence of 6.5k-arginine/glutamate rich polypeptide (6.5k-AGRP) from the seeds of sponge gourd (Luffa cylindrica) has been determined. The 6.5k-AGRP consists of a 47-residue polypeptide chain containing two disulfide bonds, and a molecular mass calculated to be 5695 Da, which fully coincides with a value of [Μ + H] + = m/z 5693.39 obtained by matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF MS). The mass spectrometric evidence indicated that 6.5k-AGRP is also present partially truncated at the C-terminus. In our preparations, approximately half of the polypeptide molecules have the C-terminal sequence Arg-Arg-Glu-Val-Asp; the other half lack Val-Asp and end with the glutamic acid, making a total of 45 residues in the polypeptide chain. The two disulfide bonds connect Cys12 to Cys33 and Cys16 to Cys29. Comparison of the amino acid sequence of 6.5k-AGRP with those of the other known proteins included in the PIR protein sequence database showed that it is related to the amino acid sequence of the N-terminal region encoded by the first exon of the cocoa (Theobroma cacao) and cotton seeds vicilin genes, sharing a characteristic two Cys-Xaa-Xaa-Xaa-Cys motif.

Original languageEnglish
Pages (from-to)984-988
Number of pages5
JournalBioscience, Biotechnology and Biochemistry
Volume61
Issue number6
DOIs
Publication statusPublished - Jan 1997

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Analytical Chemistry
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Organic Chemistry

Fingerprint Dive into the research topics of 'Primary structure of 6.5k-arginine/glutamate-rich polypeptide from the seeds of sponge gourd (luffa cylindrica)'. Together they form a unique fingerprint.

Cite this