PINIR

PINIR catalogs and annotates Pin-II type protease inhibitor protein sequences and their structural elements to support research on plant serine protease inhibitors of the Potato type-II Inhibitor family.

Key Features:

• Systematic Collection and Annotation: PINIR contains a curated collection of 415 Pin-II type PI protein sequences that were manually annotated.
• Detailed Mapping of Structural Elements: The database maps signature sequences and reports 695 inhibitory domains, 75 linkers, 63 reactive center loops, and 10 disulfide bond patterns.
• Novel Subcategories Identification: Comprehensive analysis identified novel subcategories of Pin-II type PIs and species-correlated occurrences of inhibitory domains, reactive center loops, and disulfide bond patterns.
• Predictive Insights on Variants: Analysis of linker regions predicts that alternative processing at these sites could generate PI variants within the Solanaceae family.
• Conserved Species-Specific Features: PINIR analysis highlights conserved species-specific sequence and structural features relevant to function and evolutionary adaptation.

Scientific Applications:

• Protein Engineering: The mapped inhibitory domains and reactive center loops facilitate engineering of Pin-II PIs with altered specificity or properties.
• Agricultural Applications: Knowledge of sequence and structural diversity can inform crop protection strategies via deployment or modification of Pin-II PIs.
• Therapeutic Development: Structural and functional insights into Pin-II type serine protease inhibitors can inform design of therapeutic agents targeting serine proteases.

Methodology:

Manually curated and manually annotated sequence collection with mapping of signature sequences and analysis of linker regions and other structural elements to identify subcategories and species-correlated features.