PreprintCited by 13Machine Learning in BioinformaticsProtein Structure and DynamicsEnzyme Structure and Function

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Enhanced prediction of protein functional identity through the integration of sequence and structural features

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Fujita, Suguru, Terada, Tohru·2024·Computational and Structural Biotechnology Journal

Preprint — published as 10.1016/j.csbj.2024.11.028 · Paper page

Abstract

Although over 300 million protein sequences are registered in a reference sequence database, only 0.2% have experimentally determined functions. This suggests that many valuable proteins, potentially catalyzing novel enzymatic reactions, remain undiscovered among the vast number of function-unknown proteins. In this study, we developed a method to predict whether two proteins catalyze the same enzymatic reaction by analyzing sequence and structural similarities, utilizing structural models predicted by AlphaFold2. We performed pocket detection and domain decomposition for each structural model. The similarity between protein pairs was assessed using features such as full-length sequence similarity, domain structural similarity, and pocket similarity. We developed several models using conventional machine learning algorithms and found that the LightGBM-based model outperformed the models. Our method also surpassed existing approaches, including those based solely on full-length sequence similarity and state-of-the-art deep learning models. Feature importance analysis revealed that domain sequence identity, calculated through structural alignment, had the greatest influence on the prediction. Therefore, our findings demonstrate that integrating sequence and structural information improves the accuracy of protein function prediction.

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Metadata

Authors
Fujita, S., & Terada, T.
Affiliations
The University of Tokyo (JP)
Corresponding author
Terada, Tohru
Venue
Computational and Structural Biotechnology Journal
Publisher
openRxiv
Published
2024-10-02
Volume
23
Pages
4124-4130
ISSN
2001-0370 (ISSN-L)
OpenAlex
W4404387678
Cited by
13
References
1
Citations by year
2026: 6 · 2025: 7
FWCI
1.76
Type
journal article
Language
en
Open access
Locations
  • Computational and Structural Biotechnology Journal (publishedVersion, cc-by-nc-nd)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Japan Agency for Medical Research and Development (JP24ama121027)
  • Japan Society for the Promotion of Science (22H05126, JP22H05126, JP24ama121027)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Machine Learning in Bioinformatics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Structural Biology › Enzyme Structure and Function
Keywords
protein function prediction, enzyme function prediction, sequence-structure integration, domain decomposition, structural alignment, LightGBM, feature importance analysis

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