If your crystal structure does not already contain a glucose bound you could run a molecular dynamics simulation. The link points to the PDB site for glucose. You can inspect structures with a bound or unbound glucose molecule. Also, have a look at the example study where the authors have analyzed glycated sites in collagen. 

https://www3.rcsb.org/ligand/BGC

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5068345/#bb0090

Hi,

If you are looking for dynamics study of glycated protein, you can do following steps:

1. by using discovery studio, link glucose to your protein

2. Using GAUSSIAN, do structure optimization of glycated amino acid of your protein

3. Generate parameter for glycated amino acid

4. MD simulation of glycated protein

Hi,dear Sadeghian 

I think that you have to use special method such as molecular dynamics.

any atoms in pdb file have coordinated and you can't add any atom with way manual or edit pdb file.also for download glucose units you can use protein data bank

I hope to help you