Dual functions of single-stranded DNA-binding protein in helicase loading at the bacteriophage T4 DNA replication fork.

Semi-conservative DNA synthesis reactions catalyzed by the bacteriophage T4 DNA polymerase holoenzyme are initiated by a strand displacement mechanism requiring gp32, the T4 single-stranded DNA (ssDNA)-binding protein, to sequester the displaced strand. After initiation, DNA helicase acquisition by the nascent replication fork leads to a dramatic increase in the rate and processivity of leading strand DNA synthesis. In vitro studies have established that either of two T4-encoded DNA helicases, gp41 or dda, is capable of stimulating strand displacement synthesis.

Porcine kallikrein-4 activation, glycosylation, activity, and expression in prokaryotic and eukaryotic hosts.

Kallikrein-4 (KLK4) is a serine proteinase believed to be important in the normal development of dental enamel. We isolated native KLK4 from developing pig enamel and expressed four recombinant forms. Pig KLK4 was expressed in bacteria with and without the propeptide, and in two eukaryotic systems.