Primary structure and gene localization of human prolidase

Area of Science:

• Molecular Biology
• Human Genetics
• Enzymology

Background:

• Prolidase (imidodipeptidase) is a crucial enzyme involved in peptide metabolism.
• Understanding prolidase's molecular characteristics is essential for diagnosing and treating related inherited disorders.

Purpose of the Study:

• To isolate and characterize complementary DNA (cDNA) clones encoding human prolidase.
• To determine the complete amino acid sequence and map the gene location of human prolidase.

Main Methods:

• Isolation of human prolidase cDNA clones from liver and placental cDNA libraries.
• Nucleotide sequencing of cDNA inserts.
• Comparison of predicted amino acid sequences with experimentally determined sequences.
• Gene mapping using established genetic markers.

Main Results:

• Two cDNA clones, lambda PL21 and lambda PP6, were isolated and analyzed.
• The complete coding region and 3'-untranslated region of human prolidase mRNA were identified.
• The mature enzyme consists of 492 residues with a molecular weight of 54,305 Da.
• The prolidase sequence is unique, with similarity to F1-ATPase subunits.
• The human prolidase gene was mapped to chromosome 19p13.2.

Conclusions:

• The complete amino acid sequence and gene location of human prolidase have been elucidated.
• This information provides a foundation for understanding prolidase structure-function relationships.
• Further research can now focus on inherited disorders associated with prolidase deficiency.