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Deep Mutational Scan of a DNA Polymerase via Compartmentalized Self-Replication

ABSTRACT: Deep Mutational Scan of a DNA Polymerase via Compartmentalized Self-Replication

PROVIDER: PRJNA1111587 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR29025641_1.fastq.gz	Fastqsanger.gz
	SRR29025641_2.fastq.gz	Fastqsanger.gz
	SRR29025642_1.fastq.gz	Fastqsanger.gz
	SRR29025642_2.fastq.gz	Fastqsanger.gz
	SRR29025643_1.fastq.gz	Fastqsanger.gz

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Deep Mutational Scan of a DNA Polymerase via Compartmentalized Self-Replication

Project description:We present a novel platform for high-resolution mapping of DNA polymerase activity and stability under the effects of harsh chemistries that are incompatible with most other mutational scanning methods. This approach pairs compartmentalized self-replication (CSR), a high-throughput method for polymerase directed evolution, with deep mutational scanning (DMS), a method of quantifying variant effect via next-generation sequencing of libraries that are subjected to a functional selection. We demonstrate the validity of this “CSR-DMS” platform by showing that it identifies loss-of-function variants at sites with known DNA binding or catalytic activity in the wild-type protein. We further explore the efficacy of this method by imposing denaturing selective pressures (heat or guanidinium thiocyanate) during screening and showing that variants with high positive enrichment under these selective pressures possess higher resistance to denaturation in activity assays. These variants may be useful for “direct” diagnostic workflows that detect biomarkers from crude sample matrices with little to no sample purification. Furthermore, the mechanisms of stabilizing mutations can be inferred from trends in the scores of similar mutations in sequence-to-function heatmaps and corroborated by the behavior of residues of interest in molecular dynamics simulations of the wild-type protein. These mechanisms, uncovered by CSR-DMS, inform future approaches to rational design of extremely stable DNA polymerases. Overall, we propose that CSR-DMS could be used both for the study of the biophysical mechanisms of selective pressures and for the engineering of polymerases with novel capabilities.

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A deep mutational scan of the MHC class I-specific chaperone tapasin

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A deep mutational scan of the MHC class I-specific chaperone TAPBPR for sites important for peptide editing

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A comprehensive mutational scan of the TAPBPR scoop loop defines a region of the sequence-activity landscape for class I MHC interactions

Project description:The loading of high affinity peptides onto nascent class I MHC (MHC-I) molecules is facilitated by chaperones, including the class I-specific chaperone TAP-binding protein-related (TAPBPR). TAPBPR features a ‘scoop’ loop that projects towards the empty MHC-I peptide binding groove and rests above the F pocket. The scoop loop is not found in the closely related homologue tapasin, and therefore may be partly responsible for the unique antigen editing properties of TAPBPR. A deep mutational scan of the TAPBPR scoop loop defines the relative effects of all single amino acid mutations on binding and peptide-mediated release of the murine H2-Dd MHC-I allomorph. Increased hydrophobic packing between the scoop loop and rim of the peptide binding groove tightens the TAPBPR-MHC-I interaction.

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