Normal mode analysis (Phenylketonuria)

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Summary

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Normal Mode Analysis

Lab journal
For the analysis, we used the pdb structure 1J8U from the task before (Task 9 - Structure-based mutation analysis).

WEBnm@

Normalized squared displacement per residue for mode 7 to 12. The x-axis represent the residue number in the sequence, whereby 0 is the first of the structure sequence, which is residue 103 in the FASTA-sequence of P00439. the y-axis shows the normalized squared displacement.

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Mode 7

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Mode 8

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Mode 9

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Mode 10

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Mode 11

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Mode 12

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Correlation matrix of 1J8U for the residues 103 to 427 of the FASTA sequence. Red color stands for positive correlations and blue for negative.

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elNémo

ElNémo computes models for the given protein 1J8U. Thereby it calculates 100 lowest-frequency modes and provides a lot of information about the modes with different parameters and visualizations:

PDB-files with the conformations of the modes
animations of the modes of three different sites
CA-vari (calculates distance fluctuations between all C-alpha atoms)
R² residue mean square displacement of all C-alpha atoms
Frequency and collectivity of the modes

First five modes
Mode	Frequency	Collectivity
mode 7	1.00	0.5475
mode 8	1.02	0.4062
mode 9	1.36	0.2941
mode 10	1.43	0.0948
mode 11	1.60	0.3466

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B-factor analysis for the correlation between observed and normal-mode-derived atomi displacement parameters:
Correlation = 0.534 for 307 C-alpha atoms
RMSD: only if two structures are used

Theoretical every number of normal mode perturbed models can be generated. However, a high number would take a lot of time. On default five normal modes will be computed by elNémo and can be increased up to 25. Additionally more normal modes can be calculated after the run. The analyses of the five modes with lowest frequency normal modes are shown below. For the calculation of the models all atoms are used.