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Amaranth (Amaranthus hypochondriacus) vicilin subunit structure.

Alejandra Quiroga¹, E Nora Martínez, Hélène Rogniaux

¹Facultad de Ciencias Exactas, Centro de Investigación y Desarrollo en Criotecnología de Alimentos, Universidad Nacional de La Plata y Consejo Nacional de Investigaciones Científicas y Técnicas, calle 47 y 116, 1900 La Plata, Argentina.

Journal of Agricultural and Food Chemistry

|December 2, 2010

Summary

This summary is machine-generated.

Amaranth 7S-globulin, or vicilin, is composed of subunits with sequence similarities to sesame vicilin and other related proteins. This suggests amaranth vicilin originates from multiple gene families, classifying it within the vicilin group.

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Area of Science:

* Plant protein biochemistry
* Molecular characterization of seed storage proteins

Background:

* 7S-globulin (vicilin) is a minor component of amaranth storage proteins.
* Previous characterization of amaranth vicilin structure and origin is limited.

Purpose of the Study:

* To provide new information on the amaranth 7S-globulin (vicilin).
* To determine the subunit composition and sequence homology of amaranth vicilin.
* To classify amaranth vicilin within the broader vicilin protein family.

Main Methods:

* Sedimentation analysis to determine the sedimentation coefficient.
* Mass spectrometry (MS) analysis of tryptic fragments to identify subunits.
* Sequence homology analysis to compare subunits with known vicilins.

Main Results:

* Amaranth vicilin exhibited a sedimentation coefficient of 8.6 ± 0.6 S.
* Composed of main subunits: 66, 52, 38, and 16 kDa.
* 52, 38, and 16 kDa subunits showed homology to sesame vicilin.
* 66 kDa subunit displayed similarity to a putative vicilin and convicilin family members.

Conclusions:

* Amaranth 7S-globulin molecules are likely composed of subunits from at least two gene families (66 kDa and 52 kDa primary products).
* Amaranth vicilin can be classified into the vicilin group, alongside pea, broad bean, and sesame vicilins.