Archives of Microbiology

, Volume 201, Issue 1, pp 135–141 | Cite as

Congo Red affects the growth, morphology and activity of glucosamine-6-phosphate synthase in the human pathogenic fungus Sporothrix schenckii

  • Juan Francisco Sánchez-López
  • Joaquín González-Ibarra
  • Juan Ignacio Macías-Segoviano
  • Mayra Cuéllar-Cruz
  • Aurelio Álvarez-Vargas
  • Carmen Cano-Canchola
  • Everardo López-RomeroEmail author
Short Communication


Sporothrix schenckii is the etiological agent of sporotrichosis, a mycosis of humans and other mammals. Little is known about the responses of this thermodimorphic pathogen to perturbations in the cell wall (CW) by different stress conditions. Here we describe the effect of Congo Red (CR) on the fungal growth, morphogenesis and activity of glucosamine-6-phosphate (GlcN-6-P) synthase. Under conditions of yeast development, 15 µM CR abolished conidia (CN) germination, but when yeast cells were first obtained in the absence of the dye and then post-incubated in its presence, yeasts rapidly differentiated into mycelial cells. On the other hand, under conditions of mycelium development, 150 µM CR did not affect CN germination, but filamentous cells underwent structural changes characterized by a distorted CW contour, the loss of polarity and the formation of red-pigmented, hyphal globose structures. Under these conditions, CR also induced a significant and transient increase in the activity of GlcN-6-P synthase, an essential enzyme in CW biogenesis.


Sporothrix schenckii Congo Red Fungal responses 



The authors thank Dr. Julio C. Villagómez-Castro for helpful discussion of results and Q.F.B. Lilia M. Almanza-Villegas for expert technical support. Sponsorship: Consejo Nacional de Ciencia y Tecnología (Grant No. 2002-C01-39528/A-1) and Dirección de Apoyo a la Investigación y al Posgrado (DAIP), Universidad de Guanajuato, México.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Juan Francisco Sánchez-López
    • 2
  • Joaquín González-Ibarra
    • 3
  • Juan Ignacio Macías-Segoviano
    • 1
  • Mayra Cuéllar-Cruz
    • 1
  • Aurelio Álvarez-Vargas
    • 1
  • Carmen Cano-Canchola
    • 1
  • Everardo López-Romero
    • 1
    Email author
  1. 1.División de Ciencias Naturales y Exactas, Departamento de BiologíaUniversidad de GuanajuatoGuanajuatoMexico
  2. 2.Departamento de Formación Integral e InstitucionalUnidad Profesional Interdisciplinaria de Ingeniería, Campus Guanajuato del Instituto Politécnico Nacional (UPIIG-IPN)Silao de la VictoriaMexico
  3. 3.Coordinación de Vigilancia EpidemiológicaInstituto Mexicano del Seguro SocialMexicoMexico

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