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PDBsum entry 1fl9
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Structural genomics, unknown function
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PDB id
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1fl9
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Contents |
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* Residue conservation analysis
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References listed in PDB file
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Key reference
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Title
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Crystal structure of the yjee protein from haemophilus influenzae: a putative atpase involved in cell wall synthesis.
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Authors
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A.Teplyakov,
G.Obmolova,
M.Tordova,
N.Thanki,
N.Bonander,
E.Eisenstein,
A.J.Howard,
G.L.Gilliland.
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Ref.
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Proteins, 2002,
48,
220-226.
[DOI no: ]
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PubMed id
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Abstract
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A hypothetical protein encoded by the gene YjeE of Haemophilus influenzae was
selected as part of a structural genomics project for X-ray analysis to assist
with the functional assignment. The protein is considered essential to bacteria
because the gene is present in virtually all bacterial genomes but not in those
of archaea or eukaryotes. The amino acid sequence shows no homology to other
proteins except for the presence of the Walker A motif G-X-X-X-X-G-K-T that
indicates the possibility of a nucleotide-binding protein. The YjeE protein was
cloned, expressed, and the crystal structure determined by the MAD method at
1.7-A resolution. The protein has a nucleotide-binding fold with a four-stranded
parallel beta-sheet flanked by antiparallel beta-strands on each side. The
topology of the beta-sheet is unique among P-loop proteins and has features of
different families of enzymes. Crystallization of YjeE in the presence of ATP
and Mg2+ resulted in the structure with ADP bound in the P-loop. The ATPase
activity of YjeE was confirmed by kinetic measurements. The distribution of
conserved residues suggests that the protein may work as a "molecular
switch" triggered by ATP hydrolysis. The phylogenetic pattern of YjeE
suggests its involvement in cell wall biosynthesis.
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Figure 1.
Figure 1. Ribbon presentation of the polypeptide fold of YjeE.
Conserved amino acids and ADP-Mg^2+ are shown as ball- and-stick
models.
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Figure 3.
Figure 3. Stereo view of the (2F[o]-F[c]) electron density map
at the nucleotide site in monomer A. The map is contoured at the
2  level.
ADP atoms and Mg^2+ were omitted for phase calculation. The
final model for ADP, Mg^2+, and its three water ligands is shown.
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The above figures are
reprinted
by permission from John Wiley & Sons, Inc.:
Proteins
(2002,
48,
220-226)
copyright 2002.
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