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First-pass extracted concept

P(II)

Candidate: toolkit item1 source documents7 linked claims
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Aliases

nonphosphorylated P(II), signal transduction protein P(II)

Evidence Snippets

Signal transduction protein P(II) is dephosphorylated in Synechocystis sp. strain PCC 6803 by protein phosphatase PphA.
Evidence 1Source 1DOIPubMedprovenance

Supporting Sources

Linked Claims

Claim 1bypass conditionsupports2005Source 1DOIPubMed

The P(II)-dependent control mechanism can be bypassed by exposing cells to excess nitrate.

Quoted textsource-backed
This control mechanism can be bypassed by exposing cells to excess levels of nitrate.
Claim 2molecular activitysupports2005Source 1DOIPubMed

In Synechocystis sp. strain PCC 6803, PphA dephosphorylates P(II).

Quoted textsource-backed
Signal transduction protein P(II) is dephosphorylated in Synechocystis sp. strain PCC 6803 by protein phosphatase PphA.
Claim 3mutant phenotypesupports2005Source 1DOIPubMed

Mutants lacking either PphA or P(II) are impaired in efficient utilization of nitrate as the nitrogen source.

Quoted textsource-backed
Mutants lacking either PphA or P(II) were impaired in efficient utilization of nitrate as the nitrogen source.
Claim 4physiological regulationsupports2005Source 1DOIPubMed

Uncontrolled nitrate uptake causes light-dependent nitrite excretion even in wild-type cells, supporting that nitrate uptake controls nitrate utilization under limiting photon flux densities.

Quoted textsource-backed
Uncontrolled nitrate uptake leads to light-dependent nitrite excretion even in wild-type cells, confirming that nitrate uptake controls nitrate utilization in response to limiting photon flux densities.
Claim 5physiological regulationsupports2005Source 1DOIPubMed

Under limiting PSI-reduced ferredoxin, P(II) signaling mutants show excess nitrate reduction, impaired nitrite reduction, and nitrite excretion to the medium.

Quoted textsource-backed
Under conditions of limiting photosystem I (PSI)-reduced ferredoxin, excess reduction of nitrate along with impaired reduction of nitrite occurred in P(II) signaling mutants, resulting in excretion of nitrite to the medium.
Claim 6regulatory mechanismsupports2005Source 1DOIPubMed

Nonphosphorylated P(II) controls nitrate utilization in response to low light intensity by tuning down nitrate uptake to match actual reduction capacity.

Quoted textsource-backed
We present evidence that nonphosphorylated P(II) controls the utilization of nitrate in response to low light intensity by tuning down nitrate uptake to meet the actual reduction capacity.
Claim 7rescue effectsupports2005Source 1DOIPubMed

Increasing the level of PSI-reduced ferredoxin reverses the nitrite-excretion-related effect observed in P(II) signaling mutants.

Quoted textsource-backed
This effect could be reversed by increasing the level of PSI-reduced ferredoxin.