2pvb

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spinqualitylabelsall models 2pvb, resolution 0.91Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

PIKE PARVALBUMIN (PI 4.10) AT LOW TEMPERATURE (100K) AND ATOMIC RESOLUTION (0.91 A).

Overview

Several crystal structures of parvalbumin (Parv), a typical EF-hand, protein, have been reported so far for different species with the best, resolution achieving 1.5 A. Using a crystal grown under microgravity, conditions, cryotechniques (100 K), and synchrotron radiation, it has now, been possible to determine the crystal structure of the fully Ca2+-loaded, form of pike (component pI 4.10) Parv.Ca2 at atomic resolution (0.91 A)., The availability of such a high quality structure offers the opportunity, to contribute to the definition of the validation tools useful for the, refinement of protein crystal structures determined to lower resolution., Besides a better definition of most of the elements in the protein, three-dimensional structure than in previous studies, the high accuracy, thus achieved allows the detection of well-defined alternate, conformations, which are observed for 16 residues out of 107 in total., Among them, six occupy an internal position within the hydrophobic core, and converge toward two small buried cavities with a total volume of about, 60 A3. There is no indication of any water molecule present in these, cavities. It is probable that at temperatures of physiological conditions, there is a dynamic interconversion between these alternate conformations, in an energy-barrier dependent manner. Such motions for which the, amplitudes are provided by the present study will be associated with a, time-dependent remodeling of the void internal space as part of a slow, dynamics regime (millisecond timescales) of the parvalbumin molecule. The, relevance of such internal dynamics to function is discussed.

About this Structure

2PVB is a Single protein structure of sequence from Esox lucius with CA, NH4, ACE and FMT as ligands. Full crystallographic information is available from OCA.

Reference

Crystal structure of the EF-hand parvalbumin at atomic resolution (0.91 A) and at low temperature (100 K). Evidence for conformational multistates within the hydrophobic core., Declercq JP, Evrard C, Lamzin V, Parello J, Protein Sci. 1999 Oct;8(10):2194-204. PMID:10548066

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