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- W2056560532 abstract "Background Polyketides are a diverse group of biotechnologically important secondary metabolites that are produced by multi domain enzymes called polyketide synthases (PKS). Methodology/Principal Findings We have estimated frequencies of type I PKS (PKS I) – a PKS subgroup – in natural environments by using Hidden-Markov-Models of eight domains to screen predicted proteins from six metagenomic shotgun data sets. As the complex PKS I have similarities to other multi-domain enzymes (like those for the fatty acid biosynthesis) we increased the reliability and resolution of the dataset by maximum-likelihood trees. The combined information of these trees was then used to discriminate true PKS I domains from evolutionary related but functionally different ones. We were able to identify numerous novel PKS I proteins, the highest density of which was found in Minnesota farm soil with 136 proteins out of 183,536 predicted genes. We also applied the protocol to UniRef database to improve the annotation of proteins with so far unknown function and identified some new instances of horizontal gene transfer. Conclusions/Significance The screening approach proved powerful in identifying PKS I sequences in large sequence data sets and is applicable to many other protein families." @default.
- W2056560532 created "2016-06-24" @default.
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- W2056560532 date "2008-10-27" @default.
- W2056560532 modified "2023-10-14" @default.
- W2056560532 title "A Computational Screen for Type I Polyketide Synthases in Metagenomics Shotgun Data" @default.
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- W2056560532 doi "https://doi.org/10.1371/journal.pone.0003515" @default.
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