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Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
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Conserved Binding Sites

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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
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Amino acids

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Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible...
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Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
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The aspartate-less receiver (ALR) domains: distribution, structure and function.

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Aspartate-Less Receiver (ALR) domains are a common, atypical subclass of bacterial signaling proteins. These ALR domains regulate cellular responses through mechanisms distinct from traditional Receiver domains.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Two-component signaling systems regulate bacterial, archaeal, and plant responses to environmental stimuli.
  • These systems typically involve histidine kinases phosphorylating Receiver (REC) domains at a conserved aspartate residue.

Purpose of the Study:

  • To identify and characterize Aspartate-Less Receiver (ALR) domains, a subclass of REC domains lacking the conserved phosphorylatable aspartate.
  • To investigate the prevalence, function, and regulation of ALR domains.

Main Methods:

  • Bioinformatic compilation of all deposited REC domains lacking the phosphorylatable aspartate.
  • Analysis of ALR domain structures, including the archetype RitR from Streptococcus pneumoniae.
  • Integration of structural, biochemical, and genetic data.

Main Results:

  • ALR domains are surprisingly common and often linked to rare effector outputs.
  • ALRs have reconfigured active sites to act constitutively or bind non-phosphorylated signals.
  • Canonical post-phosphorylation mechanisms and dimeric interfaces are largely conserved.

Conclusions:

  • ALR domains represent an atypical subclass of REC domains with unique regulatory roles.
  • These findings offer insights into conserved activation mechanisms between ALR and REC domains.