There are no complete crystal structures available for wheat gliadins. You can utilise UniProt (http://www.uniprot.org/) to search for the structural information of gliadins. UniProt lists all the available PDB entries for each proteins as shown in the screenshot. Just below the PDB entries, it also lists if the protein have any theoretical models available in ProteinModelProtal or SwissModelRepository (SMR) etc.

The sequences for annotated gliadins from wheat (Triticum aestivum) as obtained from UniProt is also attached. You can use these sequences to generate homology models in SwissModel Portal (https://swissmodel.expasy.org). Partial homologous structures are available (such as the alpha-amylase inhibitor) on which you can build your model of gliadins. You can also use I-TASSER (https://zhanglab.ccmb.med.umich.edu/I-TASSER/) to generate complete models of gliadins.

Dear Ibrahem,

Gliadin is the major seed storage protein in wheat. The alpha/beta-gliadins can be divided into 5 homology classes. Sequence divergence between the classes is due to single base substitutions and to duplications or deletions within or near direct repeats. There are more than a 100 copies of the gene for alpha/beta-gliadin per haploid genome.

Number of Gliadin causes an allergic reaction in human. Is the cause of the celiac disease, also known as celiac sprue or gluten-sensitive enteropathy.

Firstly you can retrieve the sequence of Gliadin [Wheat] of your interest from Uniprot (www. uniprot.org) and then you can  use either Geno3D (https://geno3d-prabi.ibcp.fr/cgi-bin/geno3d_automat.pl?page=/GENO3D/geno3d_home.html) or PHYRE2 (http://www.sbg.bio.ic.ac.uk/~phyre2/html/page.cgi?id=index) to obtain its 3D structure is in PDB format.

try it.

If you want to build models with just sequences and try to modify by yourself, you can try Ponderosa Prediction Server (http://ponderosa.nmrfam.wisc.edu/model.html).

Thanks a lot for your efforts, appreciated