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Pro-major basic protein has three types of sugar chains at the pro-portion
Y Shikata1, Y Hayashi, K Yoshimatsu
1Tsukuba Research Laboratories, Eisai Company Ltd., Ibaraki, Japan.
Biochimica Et Biophysica Acta
|June 4, 1993
Summary
Researchers determined the amino-acid sequence of recombinant pro-major basic protein (proMBP) to confirm its structure and identify glycosylation sites. The study found proMBP contains O-glycoside, N-glycoside, and glycosaminoglycan sugar chains.
Area of Science:
- Biochemistry
- Molecular Biology
- Proteomics
Background:
- Recombinant pro-major basic protein (proMBP) is a key protein in cellular processes.
- Understanding the primary structure and post-translational modifications of proMBP is crucial for elucidating its function.
Purpose of the Study:
- To determine the precise amino-acid sequence of recombinant proMBP.
- To identify and characterize the glycosylation sites and types of sugar chains present in proMBP.
Main Methods:
- Purification of recombinant proMBP from Chinese hamster kidney cells.
- Protein digestion using Achromobacter proteinase I.
- Peptide characterization via amino-acid analysis and sequence analysis.
- Deglycosylation studies to confirm glycosylation sites.
Main Results:
- The complete amino-acid sequence of proMBP was confirmed, aligning with its cDNA sequence.
- Specific glycosylation sites were identified at Ser-8, Thr-9, Ser-46, and Asn-70.
- ProMBP was found to possess three distinct types of sugar chains: O-glycoside, N-glycoside, and glycosaminoglycan.
Conclusions:
- The primary structure of recombinant proMBP has been definitively established.
- The identified glycosylation sites and sugar chain types provide critical insights into proMBP's post-translational modifications and potential functions.