Approximate values for force constant and wave number associated with a low-frequency concerted motion in proteins can be evaluated by a comparison of X-ray structures
Approximate values for force constant and wave number associated with a low-frequency concerted motion in proteins can be evaluated by a comparison of X-ray structures(184 views visite) Merlino A, Sica F, Mazzarella L
J Phys Chem B (ISSN: 1520-6106, 1520-5207, 1520-5207electronic), 2007 May 17; 111(19): 5483-5486.
Keywords Parole chiave: Crystal Structure, Wave Equations, X Rays, Biological Functions, Force Constant, Wave Number, Proteins,
Affiliations Affiliazioni: *** IBB - CNR ***
Dipartimento di Chimica, Università degli Studi di Napoli Federico II, Via Cynthia, 80126 Napoli, Italy Istituto di Biostrutture e Bioimmagini, CNR, Via Mezzocannone 6, 80134 Napoli, Italy
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Approximate values for force constant and wave number associated with a low-frequency concerted motion in proteins can be evaluated by a comparison of X-ray structures
Low-frequency internal motions in protein molecules play a key role in biological functions. A direct relationship between low-frequency motions and enzymatic activity has been suggested for bovine pancreatic ribonuclease (RNase A). The flexibility-function relationship in this enzyme has been attributed to a subtle and concerted breathing motion of the beta-sheet regions occurring upon substrate binding and release. Here, we calculate an approximate value for the force constant and the wave number of the low-frequency beta-sheet breathing motion of RNase A, by using the Boltzmann hypothesis on a set of data derived from a simple conventional structural superimposition of an unusual large number of X-ray structures available for the protein. The results agree with previous observations and with theoretical predictions on the basis of normal-mode analysis. To the best of our knowledge, this is the first example in which the wave number and the force constant of a low-frequency concerted motion in a protein are directly derived from X-ray structures.
Approximate values for force constant and wave number associated with a low-frequency concerted motion in proteins can be evaluated by a comparison of X-ray structures
Approximate values for force constant and wave number associated with a low-frequency concerted motion in proteins can be evaluated by a comparison of X-ray structures
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