Abstract
The contents of sulfur amino acids in seeds of common bean ( Phaseolus vulgaris L.) are suboptimal for nutrition. They accumulate large amounts of a gamma-glutamyl dipeptide of S-methyl-cysteine, a nonprotein amino acid that cannot substitute for methionine or cysteine in the diet. Protein accumulation and amino acid composition were characterized in three genetically related lines integrating a progressive deficiency in major seed storage proteins, phaseolin, phytohemagglutinin, and arcelin. Nitrogen, carbon, and sulfur contents were comparable among the three lines. The contents of S-methyl-cysteine and gamma-glutamyl-S-methyl-cysteine were progressively reduced in the mutants. Sulfur was shifted predominantly to the protein cysteine pool, while total methionine was only slightly elevated. Methionine and cystine contents (mg per g protein) were increased by up to ca. 40%, to levels slightly above FAO guidelines on amino acid requirements for human nutrition. These findings may be useful to improve the nutritional quality of common bean.
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Claims 5
Claim · model-written summary
A progressive deficiency in seed storage proteins reduced S-methyl-cysteine and gamma-glutamyl-S-methyl-cysteine contents in common bean mutants.
- Taxon
- common bean
Phaseolus vulgarise0 - Material
- mutantse2
- Treatment
- progressive deficiency in major seed storage proteinse1
- Outcome
- contents of S-methyl-cysteine and gamma-glutamyl-S-methyl-cysteinee2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seeds of common bean ( Phaseolus vulgaris L.)”
e1“three genetically related lines integrating a progressive deficiency in major seed storage proteins”
e2“The contents of S-methyl-cysteine and gamma-glutamyl-S-methyl-cysteine were progressively reduced in the mutants”
Claim · model-written summary
Sulfur in common bean seeds was shifted predominantly to the protein cysteine pool.
- Taxon
- common beanPhaseolus vulgarise0
- Outcome
- Sulfure3
- Qualifier
- shifted predominantly to the protein cysteine poole3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seeds of common bean ( Phaseolus vulgaris L.)”
e3“Sulfur was shifted predominantly to the protein cysteine pool”
Claim · model-written summary
Total methionine in common bean seeds was only slightly elevated.
- Taxon
- common beanPhaseolus vulgarise0
- Outcome
- total methioninee4
- Qualifier
- only slightly elevatede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seeds of common bean ( Phaseolus vulgaris L.)”
e4“while total methionine was only slightly elevated”
Claim · model-written summary
Progressive deficiency in seed storage proteins increased methionine and cystine contents of common bean by up to ca. 40%.
- Taxon
- common beanPhaseolus vulgarise0
- Treatment
- progressive deficiency in major seed storage proteinse1
- Outcome
- Methionine and cystine contentse5
- Direction
- increasede5
- Value
- up to ca. 40%e5
- Qualifier
- to levels slightly above FAO guidelines on amino acid requirements for human nutritione5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seeds of common bean ( Phaseolus vulgaris L.)”
e1“three genetically related lines integrating a progressive deficiency in major seed storage proteins”
e5“Methionine and cystine contents (mg per g protein) were increased by up to ca. 40%, to levels slightly above FAO guidelines on amino acid requirements for human nutrition”
Claim · model-written summary
Nitrogen, carbon and sulfur contents were comparable among the three common bean lines.
- Taxon
- common beanPhaseolus vulgarise0
- Material
- three linese6
- Outcome
- Nitrogen, carbon, and sulfur contentse6
- Qualifier
- comparablee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seeds of common bean ( Phaseolus vulgaris L.)”
e6“Nitrogen, carbon, and sulfur contents were comparable among the three lines”
The same questions in other papers
storage · molecular: metabolites · Phaseolus vulgaris (common bean)Positive and negative results
5 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
5 papers more in this group
See all 9 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.