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Updated: May 22, 2026
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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
Published on: July 14, 2015
Hidden relationship between conserved residues and locally conserved phosphate-binding structures in NAD(P)-binding
Chih Yuan Wu1, Yun Hao Hwa, Yao Chi Chen
1Institute of Biomedical Sciences, Academia Sinica , Taipei 115, Taiwan.
The Journal of Physical Chemistry. B
|April 26, 2012
Summary
Discovering phosphate-binding motifs in low-sequence-identity proteins is challenging. This study introduces a novel strategy using pyrophosphate-binding structures to identify conserved residues, improving protein function annotation and revealing hidden sequence-structure-function relationships.
Area of Science:
- Biochemistry
- Structural Biology
- Bioinformatics
Background:
- One-dimensional (1D) motifs are crucial for protein function but difficult to detect in proteins with low sequence identity.
- Identifying conserved residues in distantly related proteins requires overcoming challenges in sequence alignment and motif detection.
Purpose of the Study:
- To develop a strategy for discovering phosphate-binding 1D motifs in nicotinamide adenine dinucleotide (phosphate) [NAD(P)]-binding proteins with low sequence identity.
- To improve the reliability of protein function annotation based on sequence data.
Main Methods:
- Determining distinct locally conserved pyrophosphate-binding structures within NAD(P)-binding proteins.
- Aligning same-length sequences corresponding to these structures to identify conserved residues.
- Analyzing the impact of side chain orientations and cofactor type (NAD vs. NADP) on motif discovery.
Main Results:
- The developed strategy successfully identifies phosphate-binding 1D motifs in proteins with low sequence identity.
- Motifs derived from different pyrophosphate-binding structures show variations in conserved glycine residue spacing and number.
- Motif reliability is influenced by side chain orientations and the specific cofactor (NAD or NADP).
Conclusions:
- The proposed method enhances the discovery of conserved residues and protein-cofactor interactions.
- Considering local backbone structure, side chain orientation, and cofactor type is essential for accurate motif-based protein function annotation.
- This approach reveals previously hidden relationships between protein sequence, structure, function, and cofactor interactions.
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