Crystal structure of the RNase MC1 mutant Y101A in complex with 5'-UMP

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.210 

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Amino acids conserved at the C-terminal half of the ribonuclease t2 family contribute to protein stability of the enzymes

Kimura, K.Numata, T.Kakuta, Y.Kimura, M.

(2004) Biosci Biotechnol Biochem 68: 1748-1757

  • DOI: https://doi.org/10.1271/bbb.68.1748
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The ribonuclease MC1 (RNase MC1) from the seeds of the bitter gourd belongs to the RNase T2 family. We evaluated the contribution of 11 amino acids conserved in the RNase T2 family to protein folding of RNase MC1. Thermal unfolding experiments showed that substitution of Tyr(101), Phe(102), Ala(105), and Phe(190) resulted in a significant decrease in themostability; the T(m) values were 47-58 degrees C compared to that for the wild type (64 degrees C). Mutations of Pro(125), Gly(127), Gly(144), and Val(165) caused a moderate decrease in thermostability (T(m): 60-62 degrees C). In contrast, mutations of Asp(107) and Gly(173) did little effect on thermostability. The contribution of Tyr(101), Phe(102), Pro(125), and Gly(127) to protein stability was further corroborated by means of Gdn-HCl unfolding and protease digestions. Taken together, it appeared that Tyr(101), Phe(102), Ala(105), Pro(125), Gly(127), Gly(144), Leu(162), Val(165), and Phe(190) conserved in the RNase T2 family play an important role in the stability of the proteins.

  • Organizational Affiliation

    Laboratory of Biochemistry, Department of Bioscience and Biotechnology, Faculty of Agriculture, Graduate School, Kyushu University, Hakozaki 6-10-1, Fukuoka 812-8581, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribonuclease MC197Momordica charantiaMutation(s): 1 
Find proteins for P23540 (Momordica charantia)
Explore P23540 
Go to UniProtKB:  P23540
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23540
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.210 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.675α = 90
b = 61.996β = 90
c = 76.393γ = 90
Software Package:
Software NamePurpose
MAR345data collection
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-10-05
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description
  • Version 1.4: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.5: 2023-10-25
    Changes: Data collection, Refinement description