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METLIN Metabolomics Database
Description repository of metabolite information as well as tandem mass spectrometry data
Research center The Scripps Research Institute
Laboratory Siuzdak laboratory at The Scripps Research Institute
Release date 2005

The METLIN Metabolomics Database is a repository of metabolite information as well as tandem mass spectrometry data. The information is provided to facilitate metabolomics experiments.

METLIN[1][2] is a metabolomics database and, as of 5 September 2012, contains over 64,727 structures. It serves as a data management system to assist in metabolite research and metabolite identification by providing public access to its repository of comprehensive MS/MS metabolite data. An annotated list of known metabolites and their mass, chemical formula, and structure are available on the METLIN website. Each metabolite is linked to outside resources such as the Kyoto Encyclopedia of Genes and Genomes (KEGG) for further reference and inquiry. Available MS/MS data are expanding continuously as more metabolite information is being deposited and discovered. The METLIN database was developed and is maintained by the Siuzdak laboratory at The Scripps Research Institute.


Since its initial implementation in 2005, the METLIN site has collected comments and suggestions from users in the biotechnology, pharmaceutical and academic communities ultimately resulting in a dynamic, intuitive, and functionally useful metabolomics tool. The improved interface allows researchers to readily search the database and characterize metabolites through features such as accurate mass, single and multiple fragment searching, neutral loss and full spectrum search capabilities. These features are designed to facilitate the value of their metabolomics MS and MS/MS data and expedite the identification process.

The METLIN metabolite database is implemented using the open-source software tool, MySQL. The predicted fragment structures have been added to METLIN database using in-silico fragmentation.[3] In addition to enhancements to the data structure, METLIN is utilizing a new database server that provides faster results than the previous server. The METLIN database currently contains accurate masses, chemical formulas, and structures. It also has tandem MS data on more than 10,000 distinct metabolites, over 50,000 high-resolution ESI-QTOF MS/MS spectra at four collision energies, and over 160,000 in silico predicted unique fragment structures.


  1. ^ Tautenhahn R, Cho K, Uritboonthai W, Zhu Z, Patti G, Siuzdak G (September 2012). "An accelerated workflow for untargeted metabolomics using the METLIN database". Nature Biotechnology. 30: 826–828. PMC 3666346Freely accessible. PMID 22965049. doi:10.1038/nbt.2348. 
  2. ^ Smith CA, I'Maille G, Want EJ, Qin C, Trauger SA, Brandon TR, Custodio DE, Abagyan R, Siuzdak G (December 2005). "METLIN: a metabolite mass spectral database" (PDF). Ther Drug Monit. 27 (6): 747–51. PMID 16404815. doi:10.1097/01.ftd.0000179845.53213.39. 
  3. ^ Wolf S, Schmidt S, Muller-Hannemann M, Neumann S (March 2010). "In silico fragmentation for computer assisted identification of metabolite mass spectra". BMC Bioinformatics. 11: 148. PMC 2853470Freely accessible. PMID 20307295. doi:10.1186/1471-2105-11-148. 

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