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Copper Homeostasis in Aspergillus nidulans Involves Coordinated Transporter Function, Expression and Cellular

Martzel Antsotegi-Uskola1, Ane Markina-Iñarrairaegui1, Unai Ugalde1

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Summary

This study reveals how Aspergillus nidulans manages copper. It identifies two key transporters, AnCtrC for general needs and AnCtrA for extreme copper scarcity, detailing their distinct roles and cellular locations.

Keywords:
Aspergillus nidulansCtrcopper homeostasiscopper toxicity responsecopper transporterscopper uptakedi-cysteine

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Area of Science:

  • Molecular biology
  • Mycology
  • Biochemistry

Background:

  • Copper ion homeostasis is crucial for cellular function.
  • Aspergillus nidulans is a model organism for studying fungal biology.
  • Understanding copper transport is vital for various biological processes.

Purpose of the Study:

  • To investigate copper ion homeostasis in Aspergillus nidulans.
  • To characterize the roles of two high-affinity copper transporters, AnCtrA and AnCtrC.
  • To elucidate the coordinated functions of copper response elements.

Main Methods:

  • RNA sequencing (RNA-seq) under standard and copper toxicity conditions.
  • Gene deletion studies to create null mutants of AnctrA and AnCtrC.
  • Cellular localization studies using microscopy.

Main Results:

  • RNA-seq identified key copper response elements with coordinated functions.
  • AnctrC null mutants showed secondary copper limitation in mild deficiency.
  • AnctrA null mutants exhibited primary copper limitation under extreme scarcity.
  • AnCtrC localized to the plasma membrane and ER-like membranes.
  • AnCtrA localized to the plasma membrane and endosome-like vesicles.

Conclusions:

  • AnCtrC is essential for meeting nutritional copper requirements.
  • AnCtrA functions as a specific transporter during extreme copper deficiency.
  • Distinct cellular localization patterns reflect the specialized roles of AnCtrA and AnCtrC.