Document Detail


Structural and functional aspects of the multiplicity of Neu differentiation factors.
MedLine Citation:
PMID:  7509448     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We used molecular cloning and functional analyses to extend the family of Neu differentiation factors (NDFs) and to explore the biochemical activity of different NDF isoforms. Exhaustive cloning revealed the existence of six distinct fibroblastic pro-NDFs, whose basic transmembrane structure includes an immunoglobulin-like motif and an epidermal growth factor (EGF)-like domain. Structural variation is confined to three domains: the C-terminal portion of the EGF-like domain (isoforms alpha and beta), the adjacent juxtamembrane stretch (isoforms 1 to 4), and the variable-length cytoplasmic domain (isoforms a, b, and c). Only certain combinations of the variable domains exist, and they display partial tissue specificity in their expression: pro-NDF-alpha 2 is the predominant form in mesenchymal cells, whereas pro-NDF-beta 1 is the major neuronal isoform. Only the transmembrane isoforms were glycosylated and secreted as biologically active 44-kDa glycoproteins, implying that the transmembrane domain functions as an internal signal peptide. Extensive glycosylation precedes proteolytic cleavage of pro-NDF but has no effect on receptor binding. By contrast, the EGF-like domain fully retains receptor binding activity when expressed separately, but its beta-type C terminus displays higher affinity than alpha-type NDFs. Likewise, structural heterogeneity of the cytoplasmic tails may determine isoform-specific rate of pro-NDF processing. Taken together, these results suggest that different NDF isoforms are generated by alternative splicing and perform distinct tissue-specific functions.
Authors:
D Wen; S V Suggs; D Karunagaran; N Liu; R L Cupples; Y Luo; A M Janssen; N Ben-Baruch; D B Trollinger; V L Jacobsen
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Molecular and cellular biology     Volume:  14     ISSN:  0270-7306     ISO Abbreviation:  Mol. Cell. Biol.     Publication Date:  1994 Mar 
Date Detail:
Created Date:  1994-03-25     Completed Date:  1994-03-25     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8109087     Medline TA:  Mol Cell Biol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1909-19     Citation Subset:  IM    
Affiliation:
Amgen, Inc., Thousand Oaks, California 91320.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/U02315;  U02316;  U02317;  U02318;  U02319;  U02320;  U02321;  U02322;  U02323;  U02324;  U02325;  U02326;  U02327;  U02328;  U02329;  U02330
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MeSH Terms
Descriptor/Qualifier:
Amino Acid Sequence
Animals
Base Sequence
Cloning, Molecular
DNA Primers / chemistry
DNA, Complementary / genetics
Gene Expression
Genes
Glycoproteins / chemistry*,  genetics,  physiology
Humans
Molecular Sequence Data
Molecular Weight
Neuregulin-1 / agonists*
Neuregulins
Phosphotyrosine
Proto-Oncogene Proteins / metabolism
RNA, Messenger / genetics
Rats
Receptor, Epidermal Growth Factor / metabolism
Receptor, erbB-2
Recombinant Proteins
Sequence Alignment
Sequence Homology, Amino Acid
Transfection
Tyrosine / analogs & derivatives,  metabolism
Chemical
Reg. No./Substance:
0/DNA Primers; 0/DNA, Complementary; 0/Glycoproteins; 0/Neuregulin-1; 0/Neuregulins; 0/Proto-Oncogene Proteins; 0/RNA, Messenger; 0/Recombinant Proteins; 0/pro-neuregulin-alpha2C, rat; 21820-51-9/Phosphotyrosine; 55520-40-6/Tyrosine; EC 2.7.10.1/Receptor, Epidermal Growth Factor; EC 2.7.10.1/Receptor, erbB-2
Comments/Corrections

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