Abstract
The chlorophyll a/b, chlorophyll a/c, and chlorophyll a/a light-harvesting proteins are part of an extended gene family that also includes the transiently expressed stress proteins, the Elips (early light-induced proteins). Four Elip homologue proteins, encoded by single-copy nuclear genes, have been identified in the Arabidopsis thaliana database. These proteins were divided into two groups according to the expression pattern under light-stress conditions and the predicted secondary structure. Group one included two members of the Elip family with three predicted transmembrane helices and a gene expression strictly related to light stress. Group two included two proteins, the Seps (stress-enhanced proteins), which possessed two predicted transmembrane segments. The transcripts of Sep1 and Sep2 were present under low light conditions, but their level increased 4- to 10-fold during illumination of plants with high-intensity light. Preliminary data indicated that the induced transcripts were translated in vivo. Other physiological stress conditions, such as cold, heat, desiccation, salt, wounding, or oxidative stress, did not significantly influence the expression of Sep genes. In vitro import of radioactively labeled precursors of Seps into isolated chloroplasts confirmed the thylakoid membrane localization of these proteins. Considering the predicted protein structure and homology to other pigment-antenna proteins, the two-helix Seps might represent an evolutionary missing link between the one- and three-helix antenna proteins present in pro- and eukaryota.
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Claims 11
Claim · model-written summary
Four single-copy nuclear gene encoded Elip homologues were identified.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae0 - Gene
- Elip homologue proteinse0
- Outcome
- Four Elip homologue proteinse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Four Elip homologue proteins, encoded by single-copy nuclear genes, have been identified in the Arabidopsis thaliana database.”
Claim · model-written summary
The proteins separated into two groups based on expression and predicted structure.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Outcome
- two groupse0
- Qualifier
- expression pattern under light-stress conditions and the predicted secondary structuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These proteins were divided into two groups according to the expression pattern under light-stress conditions and the predicted secondary structure.”
e1“Arabidopsis thaliana database”
Claim · model-written summary
Group one had two Elip members with three predicted transmembrane helices.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Gene
- Elipe0
- Outcome
- three predicted transmembrane helicese0
- Value
- three predicted transmembrane helicese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Group one included two members of the Elip family with three predicted transmembrane helices and a gene expression strictly related to light stress.”
e1“Arabidopsis thaliana database”
Claim · model-written summary
Group one Elip expression was strictly related to light stress.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- light stresse0
- Gene
- Elipe0
- Outcome
- gene expressione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Group one included two members of the Elip family with three predicted transmembrane helices and a gene expression strictly related to light stress.”
e1“Arabidopsis thaliana database”
Claim · model-written summary
Group two Sep proteins had two predicted transmembrane segments.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Gene
- Sepse0
- Outcome
- two predicted transmembrane segmentse0
- Value
- two predicted transmembrane segmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Group two included two proteins, the Seps (stress-enhanced proteins), which possessed two predicted transmembrane segments.”
e1“Arabidopsis thaliana database”
Claim · model-written summary
Sep1 and Sep2 transcripts were present under low light.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Gene
- Sep1 and Sep2e0
- Outcome
- transcripts of Sep1 and Sep2 were presente0
- Qualifier
- under low light conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The transcripts of Sep1 and Sep2 were present under low light conditions”
e1“Arabidopsis thaliana database”
Claim · model-written summary
High-intensity light increased Sep1 and Sep2 transcripts 4- to 10-fold.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- high-intensity lighte0
- Gene
- Sep1 and Sep2e0
- Outcome
- transcripts of Sep1 and Sep2e0
- Direction
- increasede0
- Value
- 4- to 10-folde0
- Comparator
- low light conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The transcripts of Sep1 and Sep2 were present under low light conditions, but their level increased 4- to 10-fold during illumination of plants with high-intensity light.”
e1“Arabidopsis thaliana database”
Claim · model-written summary
Preliminary data indicated induced transcripts were translated in vivo.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Outcome
- induced transcripts were translated in vivoe0
- Qualifier
- Preliminary datae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Preliminary data indicated that the induced transcripts were translated in vivo.”
e1“Arabidopsis thaliana database”
Claim · model-written summary
Cold, heat, desiccation, salt, wounding and oxidative stress did not significantly influence Sep expression.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- cold, heat, desiccation, salt, wounding, or oxidative stresse0
- Gene
- Sepe0
- Outcome
- expression of Sep genese0
- Direction
- did not significantly influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Other physiological stress conditions, such as cold, heat, desiccation, salt, wounding, or oxidative stress, did not significantly influence the expression of Sep genes.”
e1“Arabidopsis thaliana database”
Claim · model-written summary
Import experiments confirmed Sep localization in the thylakoid membrane.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Organ / stage
- thylakoid membranee0
- Gene
- Sepse0
- Outcome
- thylakoid membrane localizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In vitro import of radioactively labeled precursors of Seps into isolated chloroplasts confirmed the thylakoid membrane localization of these proteins.”
e1“Arabidopsis thaliana database”
Claim · model-written summary
The authors propose that two-helix Seps may link one- and three-helix antenna proteins evolutionarily.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Gene
- Sepse0
- Outcome
- evolutionary missing linke0
- Qualifier
- mighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the two-helix Seps might represent an evolutionary missing link between the one- and three-helix antenna proteins present in pro- and eukaryota.”
e1“Arabidopsis thaliana database”
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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.