9FYD

tubulin - cryptophycin-uD[Dab] complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 

Starting Model: experimental
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Ligand Structure Quality Assessment 


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Literature

Highly Cytotoxic Cryptophycin Derivatives with Modification in Unit D for Conjugation.

Dessin, C.Schachtsiek, T.Voss, J.Abel, A.C.Neumann, B.Stammler, H.G.Prota, A.E.Sewald, N.

(2024) Angew Chem Int Ed Engl : e202416210-e202416210

  • DOI: https://doi.org/10.1002/anie.202416210
  • Primary Citation of Related Structures:  
    9FYD

  • PubMed Abstract: 

    Cytotoxic payloads for drug conjugates suitable for directed tumor therapy need to be highly potent and require a functional group for conjugation with the homing device (antibody, peptide, or small molecule). Cryptophycins are cyclodepsipeptides that stand out from the realm of natural products due to their extraordinarily high cytotoxicity. However, the installation of a suitable conjugation handle without compromising the toxicity is highly challenging. The unit D, natively 2-hydroxyisocaproic acid (leucic acid), was envisaged as a promising attachment site based on structural information from X-ray analysis. A versatile, scalable and efficient synthetic route towards conjugable cryptophycins with modification in unit D was developed and an array of new cryptophycin analogues was synthesized. Several derivatives, especially those containing lipophilic groups with low steric demand such as alkylated amino groups, exhibit low picomolar cytotoxicity often combined with efficacy against multidrug-resistant tumor cells. The newly established cryptophycin analogues comprise a broad range of relevant functional groups used as conjugation handles, among them amino, hydroxy, carboxy, as well as sulfur-containing derivatives. X-ray crystallographic analysis of a tubulin-bound cryptophycin together with quantitative structure activity relationship manifested rationales for the synthesis of most potent cryptophycin derivatives and further confirmed the suitability of modifications in unit D.


  • Organizational Affiliation

    Bielefeld University, Chemistry, GERMANY.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tubulin alpha-1B chain
A, C
451Bos taurusMutation(s): 0 
EC: 3.6.5
UniProt
Find proteins for P81947 (Bos taurus)
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Go to UniProtKB:  P81947
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP81947
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Tubulin beta-2B chain
B, D
445Bos taurusMutation(s): 0 
UniProt
Find proteins for Q6B856 (Bos taurus)
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Entity Groups  
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UniProt GroupQ6B856
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Stathmin-4143Rattus norvegicusMutation(s): 0 
Gene Names: Stmn4
UniProt
Find proteins for P63043 (Rattus norvegicus)
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Go to UniProtKB:  P63043
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UniProt GroupP63043
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Tubulin tyrosine ligase384Gallus gallusMutation(s): 0 
Gene Names: TTL
EC: 6.3.2.25
UniProt
Find proteins for A0A8V0Z8P0 (Gallus gallus)
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UniProt GroupA0A8V0Z8P0
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  • Reference Sequence
Small Molecules
Ligands 7 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
A1IHR (Subject of Investigation/LOI)
Query on A1IHR

Download Ideal Coordinates CCD File 
S [auth D],
T [auth D]
cryptophycin-uD[Dab]
C34 H43 Cl N4 O7
MSHHVMADHYNOPF-YKWMBZHHSA-N
GTP
Query on GTP

Download Ideal Coordinates CCD File 
G [auth A],
O [auth C]
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
ACP
Query on ACP

Download Ideal Coordinates CCD File 
V [auth F]PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER
C11 H18 N5 O12 P3
UFZTZBNSLXELAL-IOSLPCCCSA-N
GDP
Query on GDP

Download Ideal Coordinates CCD File 
K [auth B],
R [auth D]
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
MES
Query on MES

Download Ideal Coordinates CCD File 
N [auth B]2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
CA
Query on CA

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I [auth A],
J [auth A],
M [auth B],
Q [auth C]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
H [auth A],
L [auth B],
P [auth C],
U [auth D],
W [auth F]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.14α = 90
b = 157.67β = 90
c = 179.97γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
Cootmodel building
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Union (EU)European Union642004
European Union (EU)European Union860070
Swiss National Science FoundationSwitzerland310030_192566
European Union (EU)European Union861316

Revision History  (Full details and data files)

  • Version 1.0: 2024-10-09
    Type: Initial release