RZParser

RZParser identifies and characterizes ribose zipper motifs in RNA three-dimensional structures from PDB files to analyze tertiary hydrogen-bonding interactions relevant to RNA folding and function.

Key Features:

• Identification of Ribose Zippers: Systematically identifies ribose zipper motifs defined by consecutive hydrogen-bonding interactions between ribose 2'-hydroxyl groups within or between RNA chains, including base-backbone and base-base contacts such as A-minor interactions.
• Visualization Support: Generates PyMol scripts to visualize identified ribose zippers within molecular models.
• Comprehensive Analysis: Analyzes ribose zippers for sequence conservation, structural conservation, stability, location in secondary structure, and phylogenetic conservation.
• Classification of Ribose Zippers: Defines eleven types of ribose zippers based on ribose-base interactions, seven of which are observed in ribosomal RNAs, with the canonical ribose zipper prevalent and previously identified in the P4-P6 group I intron fragment.
• Structural Insights: Reports that ribose zippers are predominantly formed by antiparallel chain interactions and identifies an overlapping ribose zipper extending to a three-residue consecutive interaction near the ribosomal small subunit A-site.
• Interaction with Ribosomal Proteins: Indicates that approximately two-thirds of ribose zippers interact with ribosomal proteins via basic amino acid residues hydrogen-bonding to the RNA backbone, stabilizing functions and early assembly stages.
• Conservation Analysis: Shows strong sequence conservation of ribose zippers within ribosomal RNA structures and across aligned prokaryotic sequences, attributed to stacked base triples often involving adenines from loop-side segments.

Scientific Applications:

• Tertiary Structure Prediction: The sequence and structural conservation of ribose zippers can be leveraged in tertiary structure prediction models to improve RNA folding accuracy.
• Molecular Modeling and Design: Insights from ribose zipper analysis can inform the design of novel RNA molecules with targeted structural properties.
• Understanding Ribosomal Function: Characterizing ribose zipper interactions with ribosomal proteins supports studies of ribosome assembly and function relevant to antibiotic development and synthetic biology.

Methodology:

Processes PDB-formatted input to detect hydrogen-bonding between ribose 2'-hydroxyl groups, classifies motifs into eleven ribose-base interaction types, generates PyMol scripts for visualization, and performs analyses of sequence conservation, structural conservation, stability, secondary-structure location, and phylogenetic conservation across aligned prokaryotic sequences.