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Related Concept Videos

Exocrine Glands: Methods of Secretion01:08

Exocrine Glands: Methods of Secretion

Exocrine glands are those that release their secretions through ducts. Based on their mode of secretion, they can be classified into merocrine, apocrine, and holocrine.
Merocrine Secretion
Merocrine secretion is the most common type of exocrine secretion. The secretions are enclosed in vesicles and moved to the cell's apical surface, where the contents are released by exocytosis. For example, mucous, a watery secretion rich in the glycoprotein mucin, is a merocrine secretion. The eccrine glands...

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Updated: Jun 25, 2026

Microdissection of Black Widow Spider Silk-producing Glands
09:47

Microdissection of Black Widow Spider Silk-producing Glands

Published on: January 11, 2011

Silks produced by insect labial glands.

Frantisek Sehnal1, Tara Sutherland

  • 1Biology Centre ASCR, Ceské Budejovice, Czech Republic. sehnal@bc.cas.cz

Prion
|February 18, 2009
PubMed
Summary

Insect labial glands produce polymerizing silk proteins, stored as a gel. The rapid conversion to silk fiber involves conserved components but variable protein motifs, influencing silk properties.

Area of Science:

  • Zoology
  • Biochemistry
  • Materials Science

Background:

  • Insect silks are secreted from various glands, with this chapter focusing on labial glands in Holometabola.
  • Labial silk glands consist of large polyploid cells secreting polymerizing proteins stored as a semi-liquid gel.
  • Silk polymerization relies on weak molecular interactions and potentially disulfide bonds, with storage and spinning mechanisms not fully elucidated.

Purpose of the Study:

  • To review the composition and properties of silks produced by insect labial glands.
  • To explore the molecular mechanisms behind silk dope storage and fiber formation.
  • To understand the conserved and variable elements in silk protein structure and their impact on material properties.

Main Methods:

  • Literature review of insect silk gland biology and protein chemistry.

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Microdissection of Black Widow Spider Silk-producing Glands
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  • Analysis of protein structures, including repetitive amino acid motifs, beta-sheets, alpha-helices, collagen-like, polyglycine II, and coiled coil arrangements.
  • Comparative study of silk components across different insect orders, families, and genera.

    • Main Results:

    • Silk dope storage and fiber formation involve conserved components at the order level.
    • The physical properties of silk are determined by variable polymerizing motifs in fibroins at family/genus levels.
    • Silk proteins exhibit diverse structural arrangements, including beta-sheets, alpha-helices, collagen-like, polyglycine II, and coiled coil structures.
    • Sericins coat silk filaments in Lepidoptera and Trichoptera, with other minor proteins present.

    Conclusions:

    • Silk production in Holometabola labial glands is a complex process involving protein polymerization, storage, and rapid fiber formation.
    • Conserved mechanisms govern silk dope management, while fibroin's structural motifs dictate specific silk properties.
    • Understanding these diverse silk structures offers insights into biomaterials and their evolution.