Rohweder, Bettina and Lehmann, Gerhard and Eichner, Norbert and Polen, Tino and Rajendran, Chitra and Ruperti, Fabian and Linde, Mona and Treiber, Thomas and Jung, Oona and Dettmer, Katja and Meister, Gunter and Bott, Michael and Gronwald, Wolfram and Sterner, Reinhard (2019) Library Selection with a Randomized Repertoire of (beta alpha)(8)-Barrel Enzymes Results in Unexpected Induction of Gene Expression. BIOCHEMISTRY, 58 (41). pp. 4207-4217. ISSN 0006-2960,
Full text not available from this repository. (Request a copy)Abstract
The potential of the frequently encountered (beta alpha)(8)-barrel fold to acquire new functions was tested by an approach combining random mutagenesis and selection in vivo. For this purpose, the genes encoding 52 different phosphate-binding (beta alpha)(8)-barrel proteins were subjected to error-prone PCR and cloned into an expression plasmid. The resulting mixed repertoire was used to transform different auxotrophic Escherichia coli strains, each lacking an enzyme with a phosphate-containing substrate. After plating of the different transformants on minimal medium, growth was observed only for two strains, lacking either the gene for the serine phosphatase SerB or the phosphoserine aminotransferase SerC. The same mutants of the E. coli genes nanE (encoding a putative N-acetylmannosamine-6-phosphate 2-epimerase) and pdxJ (encoding the pyridoxine 5'-phosphate synthase) were responsible for rescuing both Delta serB and Delta serC. Unexpectedly, the complementing NanE and PdxJ variants did not catalyze the SerB or SerC reactions in vitro. Instead, RT-qPCR, RNAseq, and transcriptome analysis showed that they rescue the deletions by enlisting the help of endogenous E. coli enzymes HisB and HisC through exclusive up-regulation of histidine operon transcription. While the promiscuous SerB activity of HisB is well-established, our data indicate that HisC is promiscuous for the SerC reaction, as well. The successful rescue of Delta serB and Delta serC through point mutations and recruitment of additional amino acids in NanE and PdxJ provides another example for the adaptability of the (beta alpha)(8)-barrel fold.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | READ ALIGNMENT; EVOLUTION; PHOSPHATASE; QUANTIFICATION; PROTEINS; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Institut für Funktionelle Genomik > Lehrstuhl für Funktionelle Genomik (Prof. Oefner) Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie > Lehrstuhl für Biochemie I Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie > Lehrstuhl für Biochemie I > Prof. Dr. Gunter Meister |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 25 Mar 2020 10:08 |
| Last Modified: | 25 Mar 2020 10:08 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26001 |
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