Abstract: The present invention relates to methods of increasing protein expression levels whereby at least one amino acid in a protein amino acid sequence is substituted for the amino acid, proline. Preferably, the substitution occurs within 15 amino acids, more preferably within 10 amino acids and most preferably within 5 amino acids of a cysteine amino acid residue. The present invention not only includes methods for polypeptides with proline substitutions, but also polynucleotides with codon substitutions for which a codon for any amino acid, except proline, is substituted for a codon encoding for proline.

Abstract: Abstract of the Disclosure The present invention relates to methods of increasing protein expression levels whereby at least one amino acid in a protein amino acid sequence is substituted for the amino acid, proline. Preferably, the substitution occurs within 15 amino acids, more preferably within 10 amino acids and most preferably within 5 amino acids of a cysteine amino acid residue. The present invention not only includes methods for polypeptides with proline substitutions, but also polynucleotides with codon substitutions for which a codon for any amino acid, except proline, is substituted for a codon encoding for proline.