4.4 Article

Human Cellular Retinol Binding Protein II Forms a Domain-Swapped Trimer Representing a Novel Fold and a New Template for Protein Engineering

期刊

CHEMBIOCHEM
卷 21, 期 22, 页码 3192-3196

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbic.202000405

关键词

domain-swapped trimers; human cellular retinol binding protein II; metalloproteins; protein engineering

资金

  1. National Institutes of Health [GM101353]
  2. US DOE [DE-AC02-06CH11357]
  3. Michigan Economic Development Corporation
  4. Michigan Technology Tri-Corridor [085P1000817]
  5. MSU office of the Vice President for Research

向作者/读者索取更多资源

Domain-swapping is a mechanism for evolving new protein structure from extant scaffolds, and has been an efficient protein-engineering strategy for tailoring functional diversity. However, domain swapping can only be exploited if it can be controlled, especially in cases where various folds can coexist. Herein, we describe the structure of a domain-swapped trimer of the iLBP family member hCRBPII, and suggest a mechanism for domain-swapped trimerization. It is further shown that domain-swapped trimerization can be favored by strategic installation of a disulfide bond, thus demonstrating a strategy for fold control. We further show the domain-swapped trimer to be a useful protein design template by installing a high-affinity metal binding site through the introduction of a single mutation, taking advantage of its threefold symmetry. Together, these studies show how nature can promote oligomerization, stabilize a specific oligomer, and generate new function with minimal changes to the protein sequence.

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