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PDBsum entry 2c4d
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References listed in PDB file
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Key reference
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Title
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Beta-Propeller crystal structure of psathyrella velutina lectin: an integrin-Like fungal protein interacting with monosaccharides and calcium.
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Authors
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G.Cioci,
E.P.Mitchell,
V.Chazalet,
H.Debray,
S.Oscarson,
M.Lahmann,
C.Gautier,
C.Breton,
S.Perez,
A.Imberty.
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Ref.
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J Mol Biol, 2006,
357,
1575-1591.
[DOI no: ]
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PubMed id
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Abstract
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The lectin from the mushroom Psathyrella velutina recognises specifically
N-acetylglucosamine and N-acetylneuraminic acid containing glycans. The crystal
structure of the 401 amino acid residue lectin shows that it adopts a very
regular seven-bladed beta-propeller fold with the N-terminal region tucked into
the central cavity around the pseudo 7-fold axis. In the complex with
N-acetylglucosamine, six monosaccharides are bound in pockets located between
two consecutive propeller blades. Due to the repeats shown by the sequence the
binding sites are very similar. Five hydrogen bonds between the protein and the
sugar hydroxyl and N-acetyl groups stabilize the complex, together with the
hydrophobic interactions with a conserved tyrosine and histidine. The complex
with N-acetylneuraminic acid shows molecular mimicry with the same hydrogen bond
network, but with different orientations of the carbohydrate ring in the binding
site. The beta-hairpin loops connecting the two inner beta-strands of each blade
are metal binding sites and two to three calcium ions were located in the
structure. The multispecificity and high multivalency of this mushroom lectin,
combined with its similarity to the extracellular domain of an important class
of cell adhesion molecules, integrins, are another example of the outstanding
success of beta-propeller structures as molecular binding machines in nature.
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Figure 3.
Figure 3. Two orthogonal views of the crystal structure of
native PVL. Calcium and chloride ions are represented by magenta
and green spheres, respectively. Sulphate ions and
2-N-morpholino-ethanesulfonic acid (Mes) molecules are
represented by capped sticks. Plots are made using Pymol (DeLano
Scientific LLC), unless otherwise indicated.
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Figure 6.
Figure 6. Two orthogonal views of the crystal structure of
PVL complexed with GlcNAc. Calcium ions are represented by
magenta spheres, sulphate ions and GlcNAc ligands by capped
sticks.
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The above figures are
reprinted
by permission from Elsevier:
J Mol Biol
(2006,
357,
1575-1591)
copyright 2006.
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