Temperature-Independent Plant Circadian Clock: Protein Degradation Mechanism Revealed
Plant Clocks Tick On: scientists Uncover Temperature-Proof Mechanism in Arabidopsis
Nagoya, Japan – Plants, like humans, have an internal clock that helps them anticipate daily changes in their surroundings. But unlike our own, the plant circadian clock keeps ticking at a steady pace regardless of the temperature. Now, researchers at Nagoya University have uncovered the secret behind this remarkable feat.
Their findings, published in Science Advances, reveal a unique molecular mechanism that allows the plant Arabidopsis thaliana to maintain a constant circadian rhythm even when temperatures fluctuate.
“Biochemical reactions typically speed up as temperatures rise,” explains professor Norihito Nakamichi, who led the research team. “But the plant circadian clock remains remarkably stable. This is called ‘temperature compensation,’ and it’s been a puzzle for scientists.”
The team focused on two proteins, TOC1 and PRR5, known to play a role in regulating the plant’s internal clock. Through a series of experiments, they discovered that these proteins act as a kind of “brake” on the clock, slowing it down at higher temperatures.
Surprisingly, at lower temperatures, TOC1 and PRR5 are targeted for degradation, effectively releasing the brake and allowing the clock to maintain its normal pace. This temperature-dependent degradation is controlled by a protein called LKP2, which acts as a molecular switch, turning on the degradation process in cold conditions.
“think of it like a car’s cruise control,” says Nakamichi. “TOC1 and PRR5 are like the brakes,keeping the car from going too fast. LKP2 is the switch that releases the brakes when the temperature drops, allowing the car to maintain a constant speed.”
This discovery sheds new light on the intricate workings of the plant circadian clock and provides valuable insights into how organisms adapt to changing environments.
“We’re now exploring the evolutionary implications of this mechanism,” says Nakamichi.”understanding how plants have evolved to maintain a stable internal clock despite temperature fluctuations could have broader implications for our understanding of biological timekeeping in other species, including humans.”
Plant Clocks Tick On: Scientists Uncover Temperature-Proof mechanism in Arabidopsis
Nagoya, Japan – Plants, like humans, have an internal clock that helps them anticipate daily changes in their surroundings. But unlike our own, the plant circadian clock keeps ticking at a steady pace regardless of the temperature. Now, researchers at Nagoya University have uncovered the secret behind this remarkable feat.
Their findings, published in Science Advances, reveal a unique molecular mechanism that allows the plant Arabidopsis thaliana to maintain a constant circadian rhythm even when temperatures fluctuate.
“Biochemical reactions typically speed up as temperatures rise,” explains professor Norihito Nakamichi, who led the research team. “but the plant circadian clock remains remarkably stable. This is called ‘temperature compensation,’ and it’s been a puzzle for scientists.”
The team focused on two proteins, TOC1 and PRR5, known to play a role in regulating the plant’s internal clock. Through a series of experiments,they discovered that these proteins act as a kind of “brake” on the clock,slowing it down at higher temperatures.
Surprisingly, at lower temperatures, TOC1 and PRR5 are targeted for degradation, effectively releasing the brake and allowing the clock to maintain its normal pace. This temperature-dependent degradation is controlled by a protein called LKP2, which acts as a molecular switch, turning on the degradation process in cold conditions.
“Think of it like a car’s cruise control,” says Nakamichi. “TOC1 and PRR5 are like the brakes, keeping the car from going too fast. LKP2 is the switch that releases the brakes when the temperature drops, allowing the car to maintain a constant speed.”
This finding sheds new light on the intricate workings of the plant circadian clock and provides valuable insights into how organisms adapt to changing environments.
“We’re now exploring the evolutionary implications of this mechanism,” says Nakamichi. ”Understanding how plants have evolved to maintain a stable internal clock despite temperature fluctuations could have broader implications for our understanding of biological timekeeping in other species, including humans.”