7MPS

Brucella melitensis NrnC with engaged loop


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.153 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural characterization of NrnC identifies unifying features of dinucleotidases.

Lormand, J.D.Kim, S.K.Walters-Marrah, G.A.Brownfield, B.A.Fromme, J.C.Winkler, W.C.Goodson, J.R.Lee, V.T.Sondermann, H.

(2021) Elife 10

  • DOI: https://doi.org/10.7554/eLife.70146
  • Primary Citation of Related Structures:  
    7MPL, 7MPM, 7MPN, 7MPO, 7MPP, 7MPQ, 7MPR, 7MPS, 7MPT, 7MPU, 7MQB, 7MQC, 7MQD, 7MQE, 7MQF, 7MQG, 7MQH, 7MQI

  • PubMed Abstract: 

    RNA degradation is fundamental for cellular homeostasis. The process is carried out by various classes of endolytic and exolytic enzymes that together degrade an RNA polymer to mono-ribonucleotides. Within the exoribonucleases, nano-RNases play a unique role as they act on the smallest breakdown products and hence catalyze the final steps in the process. We recently showed that oligoribonuclease (Orn) acts as a dedicated diribonucleotidase, defining the ultimate step in RNA degradation that is crucial for cellular fitness (Kim et al., 2019). Whether such a specific activity exists in organisms that lack Orn-type exoribonucleases remained unclear. Through quantitative structure-function analyses, we show here that NrnC-type RNases share this narrow substrate length preference with Orn. Although NrnC and Orn employ similar structural features that distinguish these two classes of dinucleotidases from other exonucleases, the key determinants for dinucleotidase activity are realized through distinct structural scaffolds. The structures, together with comparative genomic analyses of the phylogeny of DEDD-type exoribonucleases, indicate convergent evolution as the mechanism of how dinucleotidase activity emerged repeatedly in various organisms. The evolutionary pressure to maintain dinucleotidase activity further underlines the important role these analogous proteins play for cell growth.


  • Organizational Affiliation

    Department of Molecular Medicine, Cornell University, Ithaca, United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NanoRNase C
A, B, C, D
206Brucella melitensisMutation(s): 0 
Gene Names: rnd_2
EC: 3.1.13.5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
EPE
Query on EPE

Download Ideal Coordinates CCD File 
E [auth A],
I [auth B],
P [auth C],
U [auth D]
4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
F [auth A]
G [auth A]
H [auth A]
J [auth B]
K [auth B]
F [auth A],
G [auth A],
H [auth A],
J [auth B],
K [auth B],
L [auth B],
M [auth C],
N [auth C],
O [auth C],
Q [auth D],
R [auth D],
S [auth D],
T [auth D]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.153 
  • Space Group: P 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.671α = 90
b = 110.671β = 90
c = 110.151γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01AI142400

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-15
    Type: Initial release
  • Version 1.1: 2021-09-29
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Refinement description