Cyanophycin synthetase catalyzes the polymerisation of aspartate
monomers to a polyaspartate-chain. The aspartate monomers are
covalently linked by their beta-carboxy- and alpha-amino groups.
Additional arginine side chains are observed. This biopolymer is
produced by a variety of cyaonobacteria such as
Thermosynecchococcus elongates as a storage molecule for nitrogen.
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