Document Detail

Secretion of the type 2 peritrophic matrix protein, peritrophin-15, from the cardia.
MedLine Citation:
PMID:  11376454     Owner:  NLM     Status:  MEDLINE    
The midgut of most insects is lined with a peritrophic matrix, which is thought to facilitate digestion and protect the midgut digestive epithelial cells from abrasive damage and invasion by ingested micro-organisms. The type 2 peritrophic matrix is synthesised by a complex and highly specialised organ called the cardia typically located at the junction of the cuticle-lined foregut and midgut. Although the complex anatomy of this small organ has been described, virtually nothing is known of the molecular processes that lead to the assembly of the type 2 peritrophic matrix in the cardia. As a step towards understanding the synthesis of the peritrophic matrix, the synthesis and secretion of the intrinsic peritrophic matrix protein, peritrophin-15 has been followed in the cardia of Lucilia cuprina larvae using immuno-gold localisations. The protein is synthesised by cardia epithelial cells, which have abundant rough endoplasmic reticulum, Golgi, and vesicles indicative of a general secretory function. Peritrophin-15 is packaged into secretory vesicles probably produced from Golgi and transported to the cytoplasmic face of the apical plasma membrane. The vesicles fuse with the plasma membrane at the base of the microvilli and release peritrophin-15 into the inter-microvilli spaces. The protein then becomes associated with the nascent peritrophic matrix, which lies along the tips of the epithelial cell microvilli. It is proposed that peritrophin-15 binds to the ends of chitin fibrils present in the nascent peritrophic matrix, thereby protecting the fibril from the action of exochitinases.
C Eisemann; G Wijffels; R L Tellam
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of insect biochemistry and physiology     Volume:  47     ISSN:  0739-4462     ISO Abbreviation:  Arch. Insect Biochem. Physiol.     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-05-28     Completed Date:  2001-07-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8501752     Medline TA:  Arch Insect Biochem Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  76-85     Citation Subset:  IM    
Copyright Information:
Copyright 2001 Wiley-Liss, Inc.
Molecular Animal Genetics Centre, CSIRO Livestock Industries, Gehrmann Laboratories, The University of Queensland, St Lucia, Queensland, Australia.
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MeSH Terms
Amino Acid Sequence
Carrier Proteins / secretion*
Digestive System / secretion
Diptera / metabolism*
Insect Proteins*
Molecular Sequence Data
Reg. No./Substance:
0/Carrier Proteins; 0/Insect Proteins; 0/peritrophin 15 protein, insect

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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