S-Peptide as a Potent Peptidyl Linker for Protein Cross-Linking by Microbial Transglutaminase from Streptomyces mobaraensis

We have found that ribonuclease S-peptide can work as a novel peptidyl substrate in protein cross-linking reactions catalyzed by microbial transglutaminase (MTG) from Streptomyces mobaraensis. Enhanced green fluorescent protein tethered to S-peptide at its N-terminus (S-tag-EGFP) appeared to be effi...

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Bibliographic Details
Published in:Bioconjugate chemistry 2003-03, Vol.14 (2), p.351-357
Main Authors: Kamiya, Noriho, Tanaka, Tsutomu, Suzuki, Tsutomu, Takazawa, Takeshi, Takeda, Shuji, Watanabe, Kimitsuna, Nagamune, Teruyuki
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Cross-Linking Reagents - chemistry
Electrophoresis, Polyacrylamide Gel
Mass Spectrometry
Molecular Sequence Data
Peptide Fragments - chemistry
Protein Engineering
Ribonucleases - chemistry
Spectrometry, Fluorescence
Streptomyces - enzymology
Transglutaminases - chemistry
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Summary:We have found that ribonuclease S-peptide can work as a novel peptidyl substrate in protein cross-linking reactions catalyzed by microbial transglutaminase (MTG) from Streptomyces mobaraensis. Enhanced green fluorescent protein tethered to S-peptide at its N-terminus (S-tag-EGFP) appeared to be efficiently cross-linked by MTG. As wild-type EGFP was not susceptible to cross-linking, the S-peptide moiety is likely to be responsible for the cross-linking. A site-directed mutation study assigned Gln15 in the S-peptide sequence as the sole acyl donor. Mass spectrometric analysis showed that two Lys residues (Lys5 and Lys11) in the S-peptide sequence functioned as acyl acceptors. We also succeeded in direct monitoring of the cross-linking process by virtue of fluorescence resonance energy transfer (FRET) between S-tag-EGFP and its blue fluorescent color variant (S-tag-EBFP). The protein cross-linking was tunable by either engineering S-peptide sequence or capping the S-peptide moiety with S-protein, the partner protein of S-peptide for the formation of ribonuclease A. The latter indicates that S-protein can be used as a specific inhibitor of S-peptide-directed protein cross-linking by MTG. The controllable protein cross-linking of S-peptide as a potent substrate of MTG will shed new light on biomolecule conjugation.
ISSN:1043-1802
1520-4812
DOI:10.1021/bc025610y