Biological Assembly 1  

 3D View: Structure

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 48408.38 
• Atom Count: 3288 
• Residue Count: 429 
• Unique protein chains: 1

1SQG

The crystal structure of the E. coli Fmu apoenzyme at 1.65 A resolution

• DOI: 10.2210/pdb1SQG/pdb

• Classification: TRANSFERASE
• Organism(s): Escherichia coli (strain K12)
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2004-03-18 Released: 2004-05-18 
• Deposition Author(s): Foster, P.G., Nunes, C.R., Greene, P., Moustakas, D., Stroud, R.M.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 0.257 
• R-Value Work: 0.223 

Literature

The First Structure of an RNA m5C Methyltransferase, Fmu, Provides Insight into Catalytic Mechanism and Specific Binding of RNA Substrate

Foster, P.G., Nunes, C.R., Greene, P., Moustakas, D., Stroud, R.M.

(2003) Structure 11: 1609-1620

• PubMed: 14656444 
• Primary Citation of Related Structures:  
  1SQF


• PubMed Abstract: 
  

The crystal structure of E. coli Fmu, determined at 1.65 A resolution for the apoenzyme and 2.1 A resolution in complex with AdoMet, is the first representative of the 5-methylcytosine RNA methyltransferase family that includes the human nucleolar proliferation-associated protein p120. Fmu contains three subdomains which share structural homology to DNA m(5)C methyltransferases and two RNA binding protein families. In the binary complex, the AdoMet cofactor is positioned within the active site near a novel arrangement of two conserved cysteines that function in cytosine methylation. The site is surrounded by a positively charged cleft large enough to bind its unique target stem loop within 16S rRNA. Docking of this stem loop RNA into the structure followed by molecular mechanics shows that the Fmu structure is consistent with binding to the folded RNA substrate.

---

Organizational Affiliation: 

Department of Biochemistry and Biophysics, University of California-San Francisco, San Francisco, CA 94148, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
SUN protein	A	429	Escherichia coli (strain K12)	Mutation(s): 0  Gene Names: rsmB (fmu/fmv, rrmB, sun, yhdB) EC: 2.1.1.176
Find proteins for P36929 (Escherichia coli (strain K12)) Go to UniProtKB:  P36929

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 0.257 
• R-Value Work: 0.223 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 59.672	α = 90.00
b = 48.695	β = 108.65
c = 86.802	γ = 90.00

Software Package:

Software Name	Purpose
MOLREP	phasing
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-03-18 
• Released Date: 2004-05-18 
• Deposition Author(s): Foster, P.G., Nunes, C.R., Greene, P., Moustakas, D., Stroud, R.M.

Revision History 

• Version 1.0: 2004-05-18
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance