Protein heterologous expression project can reveal to be a demanding process. Among the many factors that may affect successful expression, that of the actual coding sequence utilized has been shown in many instances to be a central issue. You may benefit from re-designing or creating de novo an expression-prone DNA sequence from he protein sequence.

Poor or no expression, troncated proteins, amino-acids misincorporation are the most common consequences of codon bias and unbalanced tRNA pool. 

This issue has been extensively studied for E. coli expression and is perfectly exemplified by the arginine codons AGG and AGA -same tRNA- which are hardly ever found in E. coli highly expressed ORFs while found with significantly higher frequency in many other organisms. It would thus make better sense to replace the latter by codons used more frequently in your host organism e.g. CGT or CGC.