1SQF image
Entry Detail
PDB ID:
1SQF
Keywords:
TRANSFERASE
Title:
The crystal structure of E. coli Fmu binary complex with S-Adenosylmethionine at 2.1 A resolution
Biological Source:
Source Organism:
Escherichia coli
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
2004-03-18
Release Date:
2004-05-18
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.10 Å
R-Value Free:
0.27
R-Value Work:
0.22
R-Value Observed:
0.23
Space Group:
P 1 21 1
1SQF validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:SUN protein
Chain IDs:A
Chain Length:429
Number of Molecules:1
Biological Source:Escherichia coli
UniProt ID:P36929 Pfam ID:PF01029, PF22458, PF01189 EC:2.1.1.176
Ligand Molecules
SAM
Primary Citation
The First Structure of an RNA m5C Methyltransferase, Fmu, Provides Insight into Catalytic Mechanism and Specific Binding of RNA Substrate
Structure 11 1609 1620 (2003)
PMID: 14656444 DOI: 10.1016/j.str.2003.10.014

Abstact

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.

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Primary Citation of related structures
1SQF