Abstract
A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation. This protein, designated an inactivator, inactivates invertase I of maize even in the presence of other proteins. No inactivation of invertase II of maize or yeast invertase has been observed. The inactivator and invertase I are found only in the endosperm. The quantity of inactivator increases in the normal endosperm during development while invertase I activity decreases. However, the altered levels of invertase I activity in several endosperm mutant lines do not result from different quantities of inactivator. The inactivator can decrease invertase I activity during a preincubation period before addition of sucrose; inactivation is noncompetitive. Invertase I activity decreases curvilinearly with an increase in inactivator concentration. At high buffer concentrations or low inactivator concentrations in the reaction mixture, a latent period is observed when invertase I is not inactivated. Inactivation increases with an increase in temperature and a decrease in pH.
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Claims 12
Claim · model-written summary
An inactivator protein from maize endosperm inactivates invertase I even in the presence of other proteins.
- Treatment
- inactivatore2
- Gene
- invertase Ie2
- Outcome
- invertase Ie2
- Direction
- inactivatese2
- Qualifier
- even in the presence of other proteinse2
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation”
e2“This protein, designated an inactivator, inactivates invertase I of maize even in the presence of other proteins”
Claim · model-written summary
The quantity of the inactivator increases in normal endosperm during development.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation”
e5“The quantity of inactivator increases in the normal endosperm during development while invertase I activity decreases”
Claim · model-written summary
Invertase I activity decreases in normal endosperm during development.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation”
e5“The quantity of inactivator increases in the normal endosperm during development while invertase I activity decreases”
Claim · model-written summary
Altered invertase I activity in several endosperm mutant lines does not result from different quantities of the inactivator.
- Material
- endosperm mutant linese6
- Outcome
- altered levels of invertase I activitye6
- Qualifier
- different quantities of inactivatore6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation”
e6“the altered levels of invertase I activity in several endosperm mutant lines do not result from different quantities of inactivator”
Claim · model-written summary
The inactivator can decrease invertase I activity during a preincubation period before sucrose is added.
- Treatment
- preincubation period before addition of sucrosee7
- Gene
- invertase Ie7
- Outcome
- invertase I activitye7
- Direction
- decreasee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation”
e7“The inactivator can decrease invertase I activity during a preincubation period before addition of sucrose; inactivation is noncompetitive”
Claim · model-written summary
Invertase I activity decreases curvilinearly with increasing inactivator concentration.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation”
e2“Invertase I activity decreases curvilinearly with an increase in inactivator concentration”
Claim · model-written summary
Inactivation of invertase I by the inactivator is noncompetitive.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation”
e7“The inactivator can decrease invertase I activity during a preincubation period before addition of sucrose; inactivation is noncompetitive”
Claim · model-written summary
A latent period without inactivation of invertase I is observed at high buffer concentrations or low inactivator concentrations.
- Treatment
- high buffer concentrations or low inactivator concentrationse2
- Outcome
- latent periode2
- Qualifier
- when invertase I is not inactivatede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation”
e2“At high buffer concentrations or low inactivator concentrations in the reaction mixture, a latent period is observed when invertase I is not inactivated”
Claim · model-written summary
Inactivation increases with an increase in temperature.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation”
e2“Inactivation increases with an increase in temperature and a decrease in pH”
Claim · model-written summary
Inactivation increases with a decrease in pH.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation”
e2“Inactivation increases with an increase in temperature and a decrease in pH”
Claim · model-written summary
No inactivation of maize invertase II or yeast invertase was observed.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“No inactivation of invertase II of maize or yeast invertase has been observed”
Claim · model-written summary
The inactivator and invertase I are found only in the endosperm of maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A protein present in the developing endosperm of maize (Zea mays L.) causes a loss of invertase activity under certain conditions of incubation”
e4“The inactivator and invertase I are found only in the endosperm”