Evidence map›Paper›PMID 22178758›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2012

Combinatorial reshaping of the Candida antarctica lipase A substrate pocket for enantioselectivity using an extremely condensed library.

Anders G Sandström, Ylva Wikmark, Karin Engström, Jonas Nyhlén, Jan-E Bäckvall

Abstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 35 papers.

0numbers the graph read from it
0cells of the map it votes in
35citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

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Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

35 citing papers in PubMed.

  1. Article
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  9. Article
  10. Learning Strategies in Protein Directed Evolution.Methods in molecular biology (Clifton, N.J.) · 2022
    Review
  11. Review
  12. Ethyl Butyrate Synthesis Catalyzed by Lipases A and B fromInternational journal of molecular sciences · 2019
    Article
  13. Direct enzymatic ethanolysis of potentialBiotechnology for biofuels · 2019
    Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Review
  19. Article
  20. Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Anders G SandströmDepartment of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden.
Ylva Wikmark
Karin Engström
Jonas Nyhlén
Jan-E Bäckvall

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

A highly combinatorial structure-based protein engineering method for obtaining enantioselectivity is reported that results in a thorough modification of the substrate binding pocket of Candida antarctica lipase A (CALA). Nine amino acid residues surrounding the entire pocket were simultaneously mutated, contributing to a reshaping of the substrate pocket to give increased enantioselectivity and activity for a sterically demanding substrate. This approach seems to be powerful for developing enantioselectivity when a complete reshaping of the active site is required. Screening toward ibuprofen ester 1, a substrate for which previously used methods had failed, gave variants with a significantly increased enantioselectivity and activity. Wild-type CALA has a moderate activity with an E value of only 3.4 toward this substrate. The best variant had an E value of 100 and it also displayed a high activity. The variation at each mutated position was highly reduced, comprising only the wild type and an alternative residue, preferably a smaller one with similar properties. These minimal binary variations allow for an extremely condensed protein library. With this highly combinatorial method synergistic effects are accounted for and the protein fitness landscape is explored efficiently.

Indexed as

Peptide LibraryAmino Acid SubstitutionCandidaCatalytic DomainEstersHomologous RecombinationIbuprofenLipaseModels, MolecularMutagenesisMutant ProteinsMutationProtein ConformationStereoisomerismSubstrate SpecificityEstersIbuprofenLipaseMutant ProteinsPeptide Library

Identifiers

PMID22178758
PMCPMC3252943

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.