P362L

P362L is a designation used in molecular biology to describe a missense variant in which the amino acid proline (P) at position 362 of a protein is replaced by leucine (L). The exact meaning of the notation depends on the reference protein sequence and isoform used to number residues; different databases may apply different reference sequences, so the position can vary between proteins.

As a single-residue substitution, P362L implies a potential change in the protein’s properties at or near residue 362. Proline is unique in its rigid ring structure, often contributing to turns or kinks and impacting local conformation. Leucine, in contrast, is a hydrophobic and more flexible amino acid. The functional consequence of a P362L change depends on the protein context: whether the residue lies in a catalytic site, a binding interface, a structurally critical core, or a flexible loop will influence the effect on stability, folding, interactions, or activity.

Researchers study P362L variants through a combination of approaches. Genetic sequencing and variant databases (such as ClinVar or other locus-specific databases) document reported occurrences and clinical associations. In silico predictions (conservation analyses, structural modeling, and tools like SIFT or PolyPhen) provide initial hypotheses about potential impact. Experimental studies, including biochemical assays, stability measurements, and structural methods (X-ray crystallography, NMR, or cryo-EM) when feasible, test the actual functional consequences.

Clinical significance is variant- and protein-specific. Some P362L substitutions may be benign, while others could contribute to disease risk or alter protein function, depending on the broader molecular context.