8CBZ

Crystal Structure of Anti-cortisol Fab in Complex with Corticosterone


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 

Starting Model: experimental
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Literature

Structural insight to elucidate the binding specificity of the anti-cortisol Fab fragment with glucocorticoids.

Eronen, V.Tullila, A.Iljin, K.Rouvinen, J.Nevanen, T.K.Hakulinen, N.

(2023) J Struct Biol 215: 107966-107966

  • DOI: https://doi.org/10.1016/j.jsb.2023.107966
  • Primary Citation of Related Structures:  
    8CBX, 8CBY, 8CBZ, 8CC0, 8CC1

  • PubMed Abstract: 

    Cortisol is a steroid hormone that is produced by the adrenal gland. It is a primary stress hormone that increases glucose levels in the blood stream. High concentrations of cortisol in the body can be used as a biomarker for acute and chronic stress and related mental and physiological disorders. Therefore, the accurate quantification of cortisol levels in body fluids is essential for clinical diagnosis. In this article, we describe the isolation of recombinant anti-cortisol antibodies with high affinity for cortisol and discover their cross-reactivity with other glucocorticoids. To describe the cortisol binding site and elucidate the structural basis for the binding specificity, the high-resolution crystal structures of the anti-cortisol (17) Fab fragment in the absence of glucocorticoid (2.00 Å) and the presence of cortisol (2.26 Å), corticosterone (1.86 Å), cortisone (1.85 Å) and prednisolone (2.00 Å) were determined. To our knowledge, this is the first determined crystal structure of a cortisol-specific antibody. The recognition of cortisol is driven by hydrophobic interactions and hydrogen bonding at the protein-ligand interface coupled with a conformational transition. Comparison of ligand-free and ligand-bound structures showed that the side chains of residues Tyr58-H and Arg56-H can undergo local conformational changes at the binding site, most likely prior to the binding event via a conformational selection mechanism. Compared to other anti-steroid antibody-antigen complexes, (17) Fab possesses a structurally unique steroid binding site, as the H3 loop from the CDR area has only a minor contribution, but framework residues have a prominent contribution to hapten binding.


  • Organizational Affiliation

    Department of Chemistry, University of Eastern Finland, PO BOX 111, 80100 Joensuu, Finland.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
anti-cortisol (17) Fab (light chain)A [auth L]211Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
anti-cortisol (17) Fab (heavy chain)B [auth H]230Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.048α = 90
b = 79.048β = 90
c = 251.187γ = 120
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
Cootmodel building
XDSdata reduction
XDSdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Academy of FinlandFinland322619

Revision History  (Full details and data files)

  • Version 1.0: 2023-05-10
    Type: Initial release
  • Version 1.1: 2024-02-07
    Changes: Data collection