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Proteins targeted to the inner chloroplast membrane, or plastid proteins, are transported by two general pathways: the stop-transfer and the re-insertion or post-import pathways. Most plastid proteins carry N-terminal transit sequences and internal import sequences targeting it to the specific chloroplast subcompartment. Proteins targeted by the stop-transfer pathway have internal hydrophobic sequences that inhibit their translocation into the stroma. As a result, these precursors are arrested...
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Chloroplasts are triple membrane structures with an outer membrane, an inner membrane, and a thylakoid membrane, each containing distinct metabolite transporters, membrane translocons, and enzymes. Appropriate sorting and translocating these proteins to their correct membrane systems is essential for chloroplast function.
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A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
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Related Experiment Video

Updated: Jun 7, 2025

Measurement of Chitinase Activity in Biological Samples
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Chitin Translocation Is Functionally Coupled with Synthesis in Chitin Synthase.

Suhao Niu1,2, Lei Qi3, Xiaoyue Zhang1,2

  • 1CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.

International Journal of Molecular Sciences
|November 9, 2024
PubMed
Summary

Chitin synthase (CHS) from Phytophthora sojae rapidly synthesizes and translocates chitin across membranes. This bifunctional enzyme is essential for chitin translocation coupled with synthesis.

Keywords:
chitin synthaseglycosyltransferasemembrane translocationprocessive

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Chitin is a crucial extracellular polysaccharide synthesized by membrane-embedded chitin synthases (CHS).
  • The mechanism by which synthesized chitin crosses the membrane to extracellular locations is not fully understood.

Purpose of the Study:

  • To investigate the mechanism of chitin translocation across the membrane.
  • To determine if chitin synthase (CHS) itself is responsible for chitin translocation.
  • To characterize the function and structure of Phytophthora sojae chitin synthase (PsCHS).

Main Methods:

  • Purification and reconstitution of Phytophthora sojae chitin synthase (PsCHS) into proteoliposomes (PLs).
  • Assessing chitin synthesis and translocation within proteoliposomes.
  • Attempting structural resolution of PsCHS in chitin-bound and UDP/Mn2+-bound states.

Main Results:

  • PsCHS functions as a processive glycosyltransferase, rapidly producing and binding highly polymerized chitin.
  • PsCHS was demonstrated to be a bifunctional enzyme, both synthesizing and translocating chitin.
  • Reconstituted PsCHS translocated newly synthesized chitin into the lumen of proteoliposomes, protecting it from degradation.
  • A high-resolution structure of the UDP/Mn2+-bound state provided insights into the enzyme's transmembrane channel.

Conclusions:

  • Phytophthora sojae chitin synthase (PsCHS) is bifunctional, responsible for both chitin synthesis and translocation.
  • Chitin translocation by PsCHS is tightly coupled to its synthesis process.
  • PsCHS is indispensable for moving chitin across the membrane to extracellular locations.