6MBL

SETD3, a Histidine Methyltransferase, in Complex with an Actin Peptide and SAH, Second P212121 Crystal Form

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 

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Literature

SETD3 is an actin histidine methyltransferase that prevents primary dystocia.

Wilkinson, A.W., Diep, J., Dai, S., Liu, S., Ooi, Y.S., Song, D., Li, T.M., Horton, J.R., Zhang, X., Liu, C., Trivedi, D.V., Ruppel, K.M., Vilches-Moure, J.G., Casey, K.M., Mak, J., Cowan, T., Elias, J.E., Nagamine, C.M., Spudich, J.A., Cheng, X., Carette, J.E., Gozani, O.

(2019) Nature 565: 372-376

  • DOI: 10.1038/s41586-018-0821-8
  • Primary Citation of Related Structures:  
    6MBJ, 6MBK, 6MBL

  • PubMed Abstract: 

    • For more than 50 years, the methylation of mammalian actin at histidine 73 has been known to occur 1 . Despite the pervasiveness of His73 methylation, which we find is conserved in several model animals and plants, its function remains unclear and the enzyme that generates this modification is unknown ...

    For more than 50 years, the methylation of mammalian actin at histidine 73 has been known to occur 1 . Despite the pervasiveness of His73 methylation, which we find is conserved in several model animals and plants, its function remains unclear and the enzyme that generates this modification is unknown. Here we identify SET domain protein 3 (SETD3) as the physiological actin His73 methyltransferase. Structural studies reveal that an extensive network of interactions clamps the actin peptide onto the surface of SETD3 to orient His73 correctly within the catalytic pocket and to facilitate methyl transfer. His73 methylation reduces the nucleotide-exchange rate on actin monomers and modestly accelerates the assembly of actin filaments. Mice that lack SETD3 show complete loss of actin His73 methylation in several tissues, and quantitative proteomics analysis shows that actin His73 methylation is the only detectable physiological substrate of SETD3. SETD3-deficient female mice have severely decreased litter sizes owing to primary maternal dystocia that is refractory to ecbolic induction agents. Furthermore, depletion of SETD3 impairs signal-induced contraction in primary human uterine smooth muscle cells. Together, our results identify a mammalian histidine methyltransferase and uncover a pivotal role for SETD3 and actin His73 methylation in the regulation of smooth muscle contractility. Our data also support the broader hypothesis that protein histidine methylation acts as a common regulatory mechanism.

    Organizational Affiliation: 

    Department of Biology, Stanford University, Stanford, CA, USA. ogozani@stanford.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Actin PeptideA [auth Y]15Homo sapiensMutation(s): 0 
Gene Names: ACTB
UniProt & NIH Common Fund Data Resources
Find proteins for P60709 (Homo sapiens)
Explore P60709 
Go to UniProtKB:  P60709
PHAROS:  P60709
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60709
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone-lysine N-methyltransferase setd3B [auth A]599Homo sapiensMutation(s): 0 
Gene Names: SETD3, C14orf154
EC: 2.1.1.43 (PDB Primary Data), 2.1.1.85 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q86TU7 (Homo sapiens)
Explore Q86TU7 
Go to UniProtKB:  Q86TU7
PHAROS:  Q86TU7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ86TU7
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.557α = 90
b = 92.83β = 90
c = 111.635γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM049245-23

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-19
    Type: Initial release
  • Version 1.1: 2019-01-16
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-13
    Changes: Database references
  • Version 1.3: 2020-01-01
    Changes: Author supporting evidence