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Related Concept Videos

Phosphoinositides and PIPs01:42

Phosphoinositides and PIPs

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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
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Protein Kinases and Phosphatases02:54

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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
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Phosphorylation01:02

Phosphorylation

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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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IP3/DAG Signaling Pathway01:11

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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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Lipids as Anchors01:32

Lipids as Anchors

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Mechanism of Filopodia Formation01:39

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Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
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PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions
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Phafins Are More Than Phosphoinositide-Binding Proteins.

Tuoxian Tang1, Mahmudul Hasan2, Daniel G S Capelluto2

  • 1Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA.

International Journal of Molecular Sciences
|May 13, 2023
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Summary

Phafin proteins, with PH and FYVE domains, bind to phosphatidylinositol 3-phosphate. This review explores their roles in cellular pathways like apoptosis and autophagy, comparing Phafin1 and Phafin2 functions.

Keywords:
FYVE domainPH domainPhafinPtdIns(3)PPtdIns(4)Pautoinhibitionmembrane remodeling

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Area of Science:

  • Molecular and Cellular Biology
  • Biochemistry

Background:

  • Phafins are proteins characterized by Pleckstrin Homology (PH) and FYVE domains.
  • They are classified into Phafin1 and Phafin2, sharing sequence homology and functional similarities.
  • Both PH and FYVE domains uniquely bind to phosphatidylinositol 3-phosphate [PtdIns(3)P].

Purpose of the Study:

  • To review the involvement of Phafin proteins in various cellular pathways.
  • To highlight the similarities and differences between Phafin1 and Phafin2.
  • To discuss potential physiological functions and future research perspectives for Phafins.

Main Methods:

  • Literature review summarizing existing research on Phafin proteins.
  • Analysis of sequence homology and functional data for Phafin1 and Phafin2.
  • Examination of phosphoinositide-binding domains and their interactions.

Main Results:

  • Phafin proteins act as effectors for PtdIns(3)P in apoptosis, endocytic trafficking, and autophagy.
  • Phafin2 exhibits recruitment to macropinocytic compartments via coincidence detection of PtdIns(3)P and PtdIns(4)P.
  • Phafins function as adaptor proteins, recruiting other molecules via their phosphoinositide-binding domains and polyaspartic acid motif.

Conclusions:

  • Phafin proteins play crucial roles in fundamental cellular processes.
  • Understanding the distinct and shared functions of Phafin1 and Phafin2 is key to elucidating their specific physiological roles.
  • Further research into Phafins holds promise for uncovering novel biological insights and potential therapeutic targets.