In other embodiments, the host cell is a Bacillus host cell that has a genome that contains inactivated protease genes.

The virus vector is able to infect a mammalian host cell and express as polypeptide the heterologous nucleotide sequences in the host cell.

It also concerns an infectious viral particle, a host cell and a pharmaceutical composition comprising said vector, viral particle or host cell.

The polynucleotide can highly express in the host cell.

Also provided are various embodiments of the host cell.

The said vector is transformed in suitable host cell.

The method includes providing a host cell that has been infected by the virus and cultivating the infected host cell at two different temperatures.

The method comprises that a prokaryotic host cell is genetically engineered to express the protein of interest and a sulfhydryl oxidase in the cytoplasm of the host cell.

A genetically enhanced cyanobacterial host cell, Cyanobacterium sp.

Method for producing a heterologous protein in a bacterial host cell such that the protein is exported from the host cell into the culture medium.

The xylonic acid is excreted outside the host cell.

The invention relates to expressing recombinant proteins in a host cell.

Escherichia coli is mainly used as the host cell.

In certain embodiments, the host cell is a Streptomyces host cell and the signal sequence is a celA signal sequence.

The present invention provides methods of producing isolated heat stable polypeptides by expressing the polypeptides in a prokaryotic host cell and subjecting the host cell to heat lysis.