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Current status of PTMs structural databases: applications, limitations and prospects

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Abstract

Protein 3D structures, determined by their amino acid sequences, are the support of major crucial biological functions. Post-translational modifications (PTMs) play an essential role in regulating these functions by altering the physicochemical properties of proteins. By virtue of their importance, several PTM databases have been developed and released in decades, but very few of these databases incorporate real 3D structural data. Since PTMs influence the function of the protein and their aberrant states are frequently implicated in human diseases, providing structural insights to understand the influence and dynamics of PTMs is crucial for unraveling the underlying processes. This review is dedicated to the current status of databases providing 3D structural data on PTM sites in proteins. Some of these databases are general, covering multiple types of PTMs in different organisms, while others are specific to one particular type of PTM, class of proteins or organism. The importance of these databases is illustrated with two major types of in silico applications: predicting PTM sites in proteins using machine learning approaches and investigating protein structure–function relationships involving PTMs. Finally, these databases suffer from multiple problems and care must be taken when analyzing the PTMs data.

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Abbreviations

3D:

Three-dimensional

ADP:

Adenosine diphosphate

CNN:

Convolutional neural network

DNA:

Deoxyribonucleic acid

GAG:

Glycosaminoglycan

HPP:

Human Proteome Project

IDP:

Intrinsically Disordered Protein

IDR:

Intrinsically Disordered Region

MBP:

Myelin basic protein

MD:

Molecular dynamics

MS:

Mass Spectrometry

nsSNP:

Non-synonymous single nucleotide polymorphism

PCA:

Pyrrolidone carboxylic acid

PPI:

Protein–protein interaction

P-site:

Phosphorylation site

PTM:

Post-translational modification

RF:

Random Forest

RNA:

Ribonucleic acid

SNO:

S-nitrosylation

SVM:

Support Vector Machine

TM:

Transmembrane

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Acknowledgements

The authors would like to thank Dr Tsikas Dimitros, the editor of this special issue for allowing us to present this review and for his kindness in granting us multiple extensions to finalize the manuscript. The authors also wish to thank all the authors of the various databases and tools whose contributions made it possible to tackle this difficult and arduous research area. AdB acknowledges the French National Research Agency with grant ANR-19-CE17-0021 (BASIN) and the Indo-French Center for the Promotion of Advanced Research/CEFIPRA for collaborative grants (numbers 5302-2).

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Correspondence to Joseph Rebehmed.

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The authors declare that they have no conflict of interest.

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The authors declare that this is a review paper where human ethical approval and informed consent are not applicable. All authors have read and agreed to the publication of the manuscript.

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Handling editor: D. Tsikas.

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de Brevern, A.G., Rebehmed, J. Current status of PTMs structural databases: applications, limitations and prospects. Amino Acids 54, 575–590 (2022). https://doi.org/10.1007/s00726-021-03119-z

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  • DOI: https://doi.org/10.1007/s00726-021-03119-z

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