Difference between revisions of "Part:BBa K3022002"

Revision as of 07:42, 3 October 2019

ppk1 in Citrobacter freundii ATCC 8090

The polyphosphate kinase in Citrobacter freundii ATCC 8090 is responsible for its intracelluar inorganic polyphosphate (polyP) production via reversibly catalyzing the transfer of terminal phosphate from ATP to a growing polyP chain. This organism is our chasiss, in which its native PPK1 will be overexpressed with a plasmid of medium-copy numbers. Although PPKs from E. coli and C. freundii shares 96% identity, the C. freundii PPK1 has a glutamate and a lysine residue in positions 327 and 328, where E. coli PPK1 has much less strongly charged alanine and glutamine residues. These natural mutations of C. freundii PPK1 are distant from the PPK1 active site and found in interfaces between monomers of the PPK1 tetramer.This leads to a dramaticl increase of intracellular polyP accumulation.

Sequence and Features

[this line was added by wyr for test]