2HKY

NMR solution structure of human RNase 7


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The flexible and clustered lysine residues of human ribonuclease 7 are critical for membrane permeability and antimicrobial activity.

Huang, Y.C.Lin, Y.M.Chang, T.W.Wu, S.J.Lee, Y.S.Chang, M.D.Chen, C.Wu, S.H.Liao, Y.D.

(2007) J.Biol.Chem. 282: 4626-4633

  • DOI: 10.1074/jbc.M607321200
  • Also Cited By: 4X09

  • PubMed Abstract: 
  • The ubiquitous ribonucleases (RNases) play important roles in RNA metabolism, angiogenesis, neurotoxicity, and antitumor or antimicrobial activity. Only the antimicrobial RNases possess high positively charged residues, although their mechanisms of a ...

    The ubiquitous ribonucleases (RNases) play important roles in RNA metabolism, angiogenesis, neurotoxicity, and antitumor or antimicrobial activity. Only the antimicrobial RNases possess high positively charged residues, although their mechanisms of action remain unclear. Here, we report on the role of cationic residues of human RNase7 (hRNase7) in its antimicrobial activity. It exerted antimicrobial activity against bacteria and yeast, even at 4 degrees C. The bacterial membrane became permeable to the DNA-binding dye SYTOX(R) Green in only a few minutes after bactericidal RNase treatment. NMR studies showed that the 22 positively charged residues (Lys(18) and Arg(4)) are distributed into three clusters on the surface of hRNase7. The first cluster, K(1),K(3),K(111),K(112), was located at the flexible coil near the N terminus, whereas the other two, K(32),K(35) and K(96),R(97),K(100), were located on rigid secondary structures. Mutagenesis studies showed that the flexible cluster K(1),K(3),K(111),K(112), rather than the catalytic residues His(15), Lys(38), and His(123) or other clusters such as K(32),K(35) and K(96),R(97),K(100), is critical for the bactericidal activity. We suggest that the hRNase7 binds to bacterial membrane and renders the membrane permeable through the flexible and clustered Lys residues K(1),K(3),K(111),K(112). The conformation of hRNase7 can be adapted for pore formation or disruption of bacterial membrane even at 4 degrees C.


    Organizational Affiliation

    Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan, Institute of Biochemical Sciences, National Taiwan University, Taipei 106 Taiwan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ribonuclease 7
A
129Homo sapiensMutation(s): 0 
Gene Names: RNASE7
EC: 3.1.27.-
Find proteins for Q9H1E1 (Homo sapiens)
Go to Gene View: RNASE7
Go to UniProtKB:  Q9H1E1
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2HKY Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-12-26
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance