Protein functional site prediction
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Protein Functional Site Prediction. The identification of protein regions responsible for stability and function is an especially important post-genomic problem

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Protein Functional Site Prediction

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Protein functional site prediction

Protein Functional Site Prediction

  • The identification of protein regions responsible for stability and function is an especially important post-genomic problem

  • With the explosion of genomic data from recent sequencing efforts, protein functional site prediction from only sequence is an increasingly important bioinformatic endeavor.


What is a functional site

What is a “Functional Site”?

  • Defining what constitutes a “functional site” is not trivial

  • Residues that include and cluster around known functionality are clear candidates for functional sites

  • We define a functional site as catalytic residues, binding sites, and regions that clustering around them.


Protein

Protein


Protein ligand

Protein + Ligand


Functional sites fs

Functional Sites (FS)


Regions that cluster around fs

Regions that Cluster Around FS


Phylogenetic motifs

Phylogenetic motifs

  • PMs are short sequence fragments that conserve the overall familial phylogeny

  • Are they functional?

  • How do we detect them?


Phylogenetic motifs1

Phylogenetic motifs

  • PMs are short sequence fragments that conserve the overall familial phylogeny

  • Are they functional?

  • How do we detect them?

  • First we design a simple heuristic to find them

  • Then we see if the detected sites are functional


Phylogenetic motif identification

Phylogenetic Motif Identification

  • Compare all windowed trees with whole tree and keep track of the partition metric scores

  • Normalize all partition metric scores by calculating z-scores

  • Call these normalized scores Phylogenetic Similarity Z-scores (PSZ)

  • Set a PSZ threshold for identifying windows that represent phylogenetic motifs


Set psz threshold

Set PSZ Threshold


Regions of pms

Regions of PMs


Protein functional site prediction

TIM

Phylogenetic Similarity

False Positive Expectation


Protein functional site prediction

TIM

Phylogenetic Similarity

False Positive Expectation


Cytochrome p450

Cytochrome P450

Phylogenetic Similarity

False Positive Expectation


Cytochrome p4501

Cytochrome P450

Phylogenetic Similarity

False Positive Expectation


Enolase

Enolase

Phylogenetic Similarity

False Positive Expectation


Glycerol kinase

Glycerol Kinase

Phylogenetic Similarity

False Positive Expectation


Glycerol kinase1

Glycerol Kinase

Phylogenetic Similarity

False Positive Expectation


Myoglobin

Myoglobin

Phylogenetic Similarity

False Positive Expectation


Myoglobin1

Myoglobin

Phylogenetic Similarity

False Positive Expectation


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