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Related Concept Videos

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Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Associative learning is a fundamental concept in behavioral psychology, wherein a connection is established between two stimuli or events, leading to a learned response. This process is critical in understanding how behaviors are acquired and modified. Conditioning, the mechanism through which associations are formed, can be divided into two main types: classical conditioning and operant conditioning, each elucidating different aspects of associative learning.
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Related Experiment Video

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An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
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Structural basis for the ORC1-Cyclin A association.

Boxiao Wang1, Jikui Song1

  • 1Department of Biochemistry, University of California, Riverside, California.

Protein Science : a Publication of the Protein Society
|July 17, 2019
PubMed
Summary
This summary is machine-generated.

The crystal structure reveals how Origin Recognition Complex subunit 1 (ORC1) binds Cyclin A-CDK2, uncovering a unique interaction mechanism. This finding offers insights for developing new cyclin/CDK complex inhibitors.

Keywords:
Cyclin ACyclin EORC1cell cycle regulationcyclin-inhibitor complex

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Cell Cycle Regulation

Background:

  • Cell cycle progression relies on cyclins and cyclin-dependent kinases (CDKs).
  • Cyclin A-CDK2 complex regulates DNA replication and S phase transition.
  • Origin Recognition Complex subunit 1 (ORC1) interacts with Cyclin A-CDK2, inhibiting centrosome reduplication.

Purpose of the Study:

  • To elucidate the molecular basis of the specific recognition between ORC1 and cyclins.
  • To provide structural insights into the ORC1-Cyclin A interaction.

Main Methods:

  • X-ray crystallography of Cyclin A-CDK2 complex bound to an ORC1-derived peptide.
  • Structural and sequence analysis of cyclins.

Main Results:

  • The crystal structure of Cyclin A-CDK2 with an ORC1 peptide was determined at 2.54 Å resolution.
  • ORC1 peptide binds Cyclin A's cyclin binding groove (CBG) via a KXL motif.
  • A flanking arginine residue in ORC1 interacts with an acidic pocket on Cyclin A, enhancing binding.

Conclusions:

  • The study provides a structural basis for specific ORC1-cyclin recognition.
  • Divergence in ORC1-binding sites across cyclins may explain differential binding activities.
  • Findings have implications for developing novel cyclin/CDK complex inhibitors.