1MJH image
Deposition Date 1998-11-04
Release Date 1998-12-23
Last Version Date 2023-12-27
Entry Detail
PDB ID:
1MJH
Title:
Structure-based assignment of the biochemical function of hypothetical protein MJ0577: A test case of structural genomics
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.25
R-Value Work:
0.21
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:PROTEIN (ATP-BINDING DOMAIN OF PROTEIN MJ0577)
Gene (Uniprot):MJ0577
Chain IDs:A, B
Chain Length:162
Number of Molecules:2
Biological Source:Methanocaldococcus jannaschii
Primary Citation
Structure-based assignment of the biochemical function of a hypothetical protein: a test case of structural genomics.
Proc.Natl.Acad.Sci.USA 95 15189 15193 (1998)
PMID: 9860944 DOI: 10.1073/pnas.95.26.15189

Abstact

Many small bacterial, archaebacterial, and eukaryotic genomes have been sequenced, and the larger eukaryotic genomes are predicted to be completely sequenced within the next decade. In all genomes sequenced to date, a large portion of these organisms' predicted protein coding regions encode polypeptides of unknown biochemical, biophysical, and/or cellular functions. Three-dimensional structures of these proteins may suggest biochemical or biophysical functions. Here we report the crystal structure of one such protein, MJ0577, from a hyperthermophile, Methanococcus jannaschii, at 1.7-A resolution. The structure contains a bound ATP, suggesting MJ0577 is an ATPase or an ATP-mediated molecular switch, which we confirm by biochemical experiments. Furthermore, the structure reveals different ATP binding motifs that are shared among many homologous hypothetical proteins in this family. This result indicates that structure-based assignment of molecular function is a viable approach for the large-scale biochemical assignment of proteins and for discovering new motifs, a basic premise of structural genomics.

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