3FZ3

Crystal Structure of almond Pru1 protein

Summary for 3FZ3

• Entry DOI: 10.2210/pdb3fz3/pdb
• Descriptor: Prunin, CALCIUM ION, SODIUM ION, ... (4 entities in total)
• Functional Keywords: tree nut allergen, allergy, pru1, prunin, amandin, almond, 11s seed storage protein, allergen
• Biological source: Prunus dulcis (sweet almond)
• Total number of polymer chains: 6
• Total formula weight: 366076.27

Authors

Jin, T.C.,Zhang, Y.Z. (deposition date: 2009-01-23, release date: 2009-11-10, Last modification date: 2017-11-01)

Primary citation

Jin, T.,Albillos, S.M.,Guo, F.,Howard, A.,Fu, T.J.,Kothary, M.H.,Zhang, Y.Z.
Crystal structure of prunin-1, a major component of the almond (Prunus dulcis) allergen amandin.
J.Agric.Food Chem., 57:8643-8651, 2009

PubMed Abstract: Seed storage proteins are accumulated during seed development and act as a reserve of nutrition for seed germination and young sprout growth. Plant seeds play an important role in human nutrition by providing a relatively inexpensive source of protein. However, many plant foods contain allergenic proteins, and the number of people suffering from food allergies has increased rapidly in recent years. The 11S globulins are the most widespread seed storage proteins, present in monocotyledonous and dicotyledonous seeds as well as in gymnosperms (conifers) and other spermatophytes. This family of proteins accounts for a number of known major food allergens. They are of interest to both the public and industry due to food safety concerns. Because of the interests in the structural basis of the allergenicity of food allergens, we sought to determine the crystal structure of Pru1, the major component of the 11 S storage protein from almonds. The structure was refined to 2.4 A, and the R/Rfree for the final refined structure is 17.2/22.9. Pru1 is a hexamer made of two trimers. Most of the back-to-back trimer-trimer association was contributed by monomer-monomer interactions. An alpha helix (helix 6) at the C-terminal end of the acidic domain of one of the interacting monomers lies at the cleft of the two protomers. The residues in this helix correspond to a flexible region in the peanut allergen Ara h 3 that encompasses a previously defined linear IgE epitope.

PubMed: 19694440
DOI: 10.1021/jf9017355

Experimental method

X-RAY DIFFRACTION (2.4 Å)