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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
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Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
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Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
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A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence
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A hidden link between leaf development and senescence.

Tomotsugu Koyama1

  • 1Bioorganic Research Institute Suntory Foundation for Life Sciences, Japan.

Plant Science : an International Journal of Experimental Plant Biology
|October 24, 2018
PubMed
Summary

Leaf senescence, a vital plant process, involves nutrient recycling. Ethylene

Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Leaf senescence is the final stage of leaf development, involving nutrient recycling and cell death.
  • Ethylene is a key plant hormone regulating leaf senescence onset.
  • The role of ethylene in senescence is influenced by leaf developmental stage.

Purpose of the Study:

  • To review the developmental regulation of leaf senescence.
  • To explore the interplay between ethylene and developmental regulators in leaf senescence.
  • To highlight the impact of developmental regulators on the timing of leaf senescence.

Main Methods:

  • Literature review focusing on plant hormone signaling and developmental biology.
  • Analysis of studies investigating ethylene's role in leaf senescence.
Keywords:
DevelopmentEthyleneRegulationSenescenceTranscription factormiRNA

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  • Synthesis of current research on developmental regulators influencing senescence.

    • Main Results:

    • Ethylene's function in leaf senescence is critically dependent on the leaf's developmental stage.
    • Developmental regulators significantly impact the onset and progression of leaf senescence.
    • A complex interplay exists between ethylene and developmental pathways in regulating senescence.

    Conclusions:

    • Understanding the developmental context is crucial for deciphering ethylene's role in leaf senescence.
    • Developmental regulators are key determinants of leaf senescence timing and execution.
    • Further research into these interactions will advance plant science and agriculture.