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Carl R. Woese Institute for Genomic Biology

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The Enzyme Function Initiative (EFI), one of the largest collaborative projects hosted at the IGB, has published a seminal paper in PNAS entitled "Prediction of function for the polyprenyl transferase subgroup in the isoprenoid synthase superfamily."

From the abstract:
"The number of available protein sequences has increased exponentially with the advent of high-throughput genomic sequencing, creating a significant challenge for functional annotation. Here, we describe a large-scale study on assigning function to unknown members of the trans-polyprenyl transferase (E-PTS) subgroup in the isoprenoid synthase superfamily, which provides substrates for the biosynthesis of the more than 55,000 isoprenoid metabolites. Although the mechanism for determining the product chain length for these enzymes is known, there is no simple relationship between function and primary sequence, so that assigning function is challenging. We addressed this challenge through large-scale bioinformatics analysis of >5,000 putative polyprenyl transferases; experimental characterization of the chain-length specificity of 79 diverse members of this group; determination of 27 structures of 19 of these enzymes, including seven cocrystallized with substrate analogs or products; and the development and successful application of a computational approach to predict function that leverages available structural data through homology modeling and docking of possible products into the active site. The crystallographic structures and computational structural models of the enzyme–ligand complexes elucidate the structural basis of specificity. As a result of this study, the percentage of E-PTS sequences similar to functionally annotated ones (BLAST e-value ≤ 1e−70) increased from 40.6 to 68.8%, and the percentage of sequences similar to available crystal structures increased from 28.9 to 47.4%. The high accuracy of our blind prediction of newly characterized enzymes indicates the potential to predict function to the complete polyprenyl transferase subgroup of the isoprenoid synthase superfamily computationally."

Read the full publication here.

The EFI is developing robust sequence/structure‑based strategies for facilitating discovery of in vitro enzymatic and in vivo metabolic/physiological functions of unknown enzymes discovered in genome projects, a crucial limitation in genomic biology. They accomplish this goal by integrating bioinformatics, structural biology, and computation with enzymology, genetics, and metabolomics.

To learn more about the EFI, please visit www.enzymefunction.org

The EFI is funded by a Large-Scale Collaborative Project (Glue Grant) from the National Institute of General Medical Sciences (U54 GM093342). The EFI is formed from approximately 80 reserachers at 9 academic institutions in the US and Canada. Home page photo copyright (2013) National Academy of Sciences, USA.

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Mining Microbial Genomes
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