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Related Concept Videos

Golgi Matrix Proteins01:12

Golgi Matrix Proteins

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Golgi matrix proteins are a group of highly dynamic proteins that maintain the stacked structure of Golgi. These proteins adapt to rapid morphological changes of the Golgi during the cell cycle. During cell division, mild proteolysis removes these connections resulting in Golgi unstacking. In The daughter cells, these proteins help reassemble the unstacked Golgi.
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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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Cytoskeletal Linker Proteins - Plakins01:09

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Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...
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Porin Insertion in the Outer Mitochondrial Membrane01:12

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
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Multi-pass Transmembrane Proteins and β-barrels01:09

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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Functional shell matrix proteins tentatively identified by asymmetric snail shell morphology.

Akito Ishikawa1, Keisuke Shimizu2, Yukinobu Isowa3

  • 1Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-0033, Japan. aishikawa.0218@gmail.com.

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Researchers identified 32 key shell matrix proteins (SMPs) in Lymnaea stagnalis by analyzing asymmetric shell growth. These SMPs exhibit distinct expression patterns, suggesting roles in regulating molluscan biomineralization.

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Area of Science:

  • Biomineralization research
  • Molluscan biology
  • Genomics and proteomics

Background:

  • Molluscan shell matrix proteins (SMPs) are critical for the formation of shells.
  • Shell asymmetry in gastropods like Lymnaea stagnalis implies asymmetric gene expression.

Purpose of the Study:

  • To identify SMPs involved in biomineralization by leveraging asymmetric shell growth.
  • To investigate the differential expression of SMP genes in the mantle tissue of Lymnaea stagnalis.

Main Methods:

  • Transcriptome analysis of left and right mantle tissues from Lymnaea stagnalis.
  • Liquid chromatography-tandem mass spectrometry (LC-MS/MS) for SMP identification.
  • Quantitative PCR (qPCR) for validating gene expression patterns.

Main Results:

  • Identified 207 SMPs, with 32 exhibiting asymmetric expression patterns between left and right mantle tissues.
  • Asymmetrically expressed SMPs were validated using qPCR.
  • SMPs more highly expressed on the left side were more abundant, suggesting potential inhibitory functions in shell formation.

Conclusions:

  • The study identified 32 novel SMP genes with asymmetric expression, potentially crucial for regulating shell formation in mollusks.
  • These SMPs possess conserved domains and low-complexity regions, indicating functional significance in biomineralization.
  • Findings provide insights into the genetic mechanisms underlying shell asymmetry and biomineralization processes.