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. 1994 Apr 1;299(Pt 1):141–150. doi: 10.1042/bj2990141

Developmental patterns of free and protein-bound biotin during maturation and germination of seeds of Pisum sativum: characterization of a novel seed-specific biotinylated protein.

M Duval 1, C Job 1, C Alban 1, R Douce 1, D Job 1
PMCID: PMC1138033  PMID: 8166632

Abstract

Mature dry pea seeds contain three major biotinylated proteins. Two of these of subunit molecular mass about 75 kDa and 200 kDa are associated with 3-methylcrotonyl-CoA carboxylase (EC 6.4.1.4) and acetyl-CoA carboxylase activities (EC 6.4.1.2) respectively. The third does not exhibit any of the biotin-dependent carboxylase activities found in higher organisms and represents the major part of the total protein-bound biotin in the seeds. This novel protein has been purified from a whole pea seed extract. Because in SDS/polyacrylamide gels the protein migrates with an apparent molecular mass of about 65 kDa, it is referred to as SBP65, for 65 kDa seed biotinylated protein. The molecular mass of native SBP65 is greater than 400 kDa, suggesting that the native protein assumes a polymeric structure, resulting from the association of six to eight identical subunits. The results of CNBr cleavage experiments suggest that biotin is covalently bound to the protein. The stoichiometry is 1 mol of biotin per 1 mol of 65 kDa polypeptide. The temporal and spatial pattern of expression of SBP65 is described. SBP65 is specifically expressed in the seeds, being absent from leaf, root, stem, pod and flower tissues of pea plants. The level of SBP65 increases dramatically during seed development. The protein is not detectable in very young seeds. Its accumulation pattern parallels that for storage proteins, being maximally expressed in the mature dry seeds. SBP65 disappears at a very high rate during seed germination. The level of free biotin has also been evaluated for various organs of pea plants. In all proliferating tissues examined (young developing seeds, leaf, root, stem, pod and flower tissues), free biotin is in excess of protein-bound biotin. Only in the mature dry seeds is protein-bound biotin (i.e. that bound to SBP65) in excess of free biotin. These temporal expression patterns, and the strict organ specificity for expression of SBP65, are discussed with regard to the possibility that in plants, as in mammals, biotin plays a specialized role in cell growth and differentiation.

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Selected References

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