Abstract
This study delves into the functional intricacies of lipoate ligase A (LplA), an enzyme showing great promise in bioconjugation due to its unique capacity for introducing azido groups into proteins without requiring a genetic tag. We aimed to enhance the understanding of LplA's functionality, particularly its substrate tolerance and the reliability of various analytical techniques. A pivotal aspect of our approach was incorporating azido groups into a range of proteins, followed by the addition of the fluorescent molecule Cy3 via click chemistry. Analysis of fluorescent intensity in the altered proteins indicated varying degrees of conjugation. Additionally, phenyl resin-based RP-HPLC facilitated effective separation of modified proteins, unmodified proteins, and remaining fluorescent tags post-separation. SASA analysis provided insights into conjugation trends, guiding the identification of proteins amenable to LplA's tag-free modification. Our findings demonstrate LplA's broad substrate tolerability for protein modification.
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Acknowledgements
The authors would like to thank their colleagues from A**omoto Co., Inc. and A**omoto-Genetika Research Institute., as follows: Dr. Sergey Vasilievich Smirnov, Dr. Ilina Libovna Tokmakova, Mr. Kota Inoue, and Dr. Yasuhiro Mihara for LplA preparation; Dr. Uno Tagami for crystal structure modeling and constructive discussion; Ms. Natsuki Shikida and Dr. Kazutaka Shimbo for protein analysis; Dr. Shigeo Hirasawa, Dr. Mototaka Suzuki and Dr. Tatsuya Okuzumi for helpful comments and suggestions in this study.
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This work was supported by A**omoto Co., Inc.
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Yamazaki, S., Takahashi, K. & Matsuda, Y. Tag-free protein modification by lipoate ligase A: exploring substrate tolerance. ANAL. SCI. 40, 1111–1119 (2024). https://doi.org/10.1007/s44211-024-00534-6
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DOI: https://doi.org/10.1007/s44211-024-00534-6