3.4.15.6 modified soluble cyanobacterial granule polypeptide + H2O in vitro guanidination of lysine side chains of soluble cyanobacterial granule polypeptide with o-methylisourea yields the nonproteinogenic amino acid homoarginine. The modified soluble cyanobacterial granule polypeptide consists of 51 mol% aspartate, 14 mol% arginine, and 35 mol% homoarginine. The modified cyanobacterial granule polypeptide can be digested in vitro using cyanophycinase, yielding a new dipeptide consisting of aspartate and homoarginine Pseudomonas alcaligenes beta-aspartate-arginine + beta-aspartate-homoarginine + ? - ? 432139 3.4.15.6 modified soluble cyanobacterial granule polypeptide + H2O in vitro guanidination of lysine side chains of soluble cyanobacterial granule polypeptide with o-methylisourea yields the nonproteinogenic amino acid homoarginine. The modified soluble cyanobacterial granule polypeptide consists of 51 mol% aspartate, 14 mol% arginine, and 35 mol% homoarginine. The modified cyanobacterial granule polypeptide can be digested in vitro using cyanophycinase, yielding a new dipeptide consisting of aspartate and homoarginine Pseudomonas alcaligenes DIP1 beta-aspartate-arginine + beta-aspartate-homoarginine + ? - ? 432139 3.4.15.6 [L-Asp(4-Arg)]n + H2O - Pseudomonas alcaligenes [L-Asp(4-Arg)]n-1 + [L-Asp(4-Arg)] - ? 378762 3.4.15.6 [L-Asp(4-Arg)]n + H2O - Synechocystis sp. [L-Asp(4-Arg)]n-1 + [L-Asp(4-Arg)] - ? 378762 3.4.15.6 [L-Asp(4-Arg)]n + H2O - Pseudomonas anguilliseptica [L-Asp(4-Arg)]n-1 + [L-Asp(4-Arg)] - ? 378762 3.4.15.6 [L-Asp(4-Arg)]n + H2O - Synechocystis sp. PCC 6803 [L-Asp(4-Arg)]n-1 + [L-Asp(4-Arg)] - ? 378762 3.4.15.6 [L-Asp(4-Arg)]n + H2O 2 g/l citrate, pH 6.5, and 37°C are ideal parameters for cyanophycinase production Pseudomonas alcaligenes [L-Asp(4-Arg)]n-1 + [L-Asp(4-Arg)] - ? 378762 3.4.15.6 [L-Asp(4-Arg)]n + H2O - Pseudomonas anguilliseptica BI [L-Asp(4-Arg)]n-1 + [L-Asp(4-Arg)] - ? 378762 3.4.15.6 [L-Asp(4-Arg)]n + H2O - Pseudomonas alcaligenes DIP1 [L-Asp(4-Arg)]n-1 + [L-Asp(4-Arg)] - ? 378762 3.4.15.6 [L-Asp(4-Arg)]n + H2O 2 g/l citrate, pH 6.5, and 37°C are ideal parameters for cyanophycinase production Pseudomonas alcaligenes DIP1 [L-Asp(4-Arg)]n-1 + [L-Asp(4-Arg)] - ? 378762