2YCB image
Deposition Date 2011-03-13
Release Date 2011-05-25
Last Version Date 2023-12-20
Entry Detail
PDB ID:
2YCB
Keywords:
Title:
Structure of the archaeal beta-CASP protein with N-terminal KH domains from Methanothermobacter thermautotrophicus
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.10 Å
R-Value Free:
0.25
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:CLEAVAGE AND POLYADENYLATION SPECIFICITY FACTOR
Gene (Uniprot):fttA
Chain IDs:A, B
Chain Length:636
Number of Molecules:2
Biological Source:METHANOTHERMOBACTER THERMAUTOTROPHICUS
Primary Citation
Structure and Activity of a Novel Archaeal Beta-Casp Protein with N-Terminal Kh Domains.
Structure 19 622 ? (2011)
PMID: 21565697 DOI: 10.1016/J.STR.2011.03.002

Abstact

MTH1203, a β-CASP metallo-β-lactamase family nuclease from the archaeon Methanothermobacter thermautotrophicus, was identified as a putative nuclease that might contribute to RNA processing. The crystal structure of MTH1203 reveals that, in addition to the metallo-β-lactamase nuclease and the β-CASP domains, it contains two contiguous KH domains that are unique to MTH1203 and its orthologs. RNA-binding experiments indicate that MTH1203 preferentially binds U-rich sequences with a dissociation constant in the micromolar range. In vitro nuclease activity assays demonstrated that MTH1203 is a zinc-dependent nuclease. MTH1203 is also shown to be a dimer and, significantly, this dimerization enhances the nuclease activity. Transcription termination in archaea produces mRNA transcripts with U-rich 3' ends that could be degraded by MTH1203 considering its RNA-binding specificity. We hypothesize that this nuclease degrades mRNAs of proteins targeted for degradation and so regulates archaeal RNA turnover, possibly in concert with the exosome.

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