Basic Salivary Proline Rich Protein 1 (PRB1)

Proline-rich proteins  fall into acidic and basic groups. The 2 genes that encode acidic proteins are PRH1 and PRH2. and these genes contain repeated sequences that have a cleavage site for the restriction enzyme HaeIII.The PRH1 locus codes for the Pa, Db, and PIF proteins. The PRH2 locus codes for the Pr protein. The 4 genes that encode basic proline-rich proteins are PRB1, PRB2, PRB3, and PRB4, and these genes contain repeated sequences that have a cleavage site for the restriction enzyme BstNI.The PRB1 locus encodes the PmF, PmS, Pe, and Con2 proteins. The PRB2 locus encodes the Ps and Con1 proteins. The PRB3 locus encodes the G1 protein. The PRB4 locus encodes the Po protein.