title: Cellular Response to the high protein digestibility/high-Lysine (hdhl) sorghum mutation.
abstract: A high protein digestibility/high-lysine mutant P721Q (hdhl) with a multi-folded protein body morphology has been developed, with a 22kDa α-kafirin single point mutation having also been recently identified. Relatively little is known regarding the resulting cellular response in hdhl endosperm. The aim is to elucidate these biochemical changes. Two-dimentional gel electrophoresis showed an apparent increase of non-kafirin and a decrease in kafirins content in hdhl endosperm. Mass spectrometry data yielded the identity of differentially expressed non-kafirin proteins in hdhl, wild-type lines such as cytoskeleton and chaperones proteins, and also others involved in amino acids and carbohydrates biochemical synthesis pathways. Western blot analysis showed that chaperone proteins were more highly expressed in the hdhl than the wild-type sorghum and confirmed the non-kafirin proteins proteomic results. Two-dimentional gel electrophoresis showed that the γ-kafirin subunits content had decreased, and the 22kDa α-kafirin subunit was increased in hdhl without any apparent molecular mass change. The observed differential expression most likely led to proteins interactions between γ- and α-kafirin subunits in particular, which resulted in a kafirins packing differently to form the protein body's multi-folded morphology, while also improving its digestibility.
authors.affiliation: Whistler Center for Carbohydrate Research, Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, IN 47907-2009, United states.
authors.forename: Mustapha
authors.initials: M
authors.lastname: Benmoussa
authors.affiliation: Central Food Technology Research Institute, Mysore, India.
authors.forename: Arun
authors.initials: A
authors.lastname: Chandrashekar
authors.affiliation: Department of Agronomy, Lilly Building, Purdue University, West Lafayette, IN 47907-2009, United states.
authors.forename: Gebisa
authors.initials: G
authors.lastname: Ejeta
authors.affiliation: Whistler Center for Carbohydrate Research, Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, IN 47907-2009, United states. Electronic address: mbenmous@purdue.edu.
authors.forename: Bruce R
authors.initials: BR
authors.lastname: Hamaker
mesh_terms: D056625:Endosperm / Q000378:metabolism*; D009154:Mutation; D010940:Plant Proteins / Q000378:metabolism*; D045868:Sorghum / Q000235:genetics* / Q000378:metabolism*; D059467:Transcriptome
chemical_list: D010940:Plant Proteins
keywords: Chaperones; Mutant; Proteomics; Sorghum; Two-dimensional gel