Amino-Terminal Sequences of Two Polypeptides from Human Serum with Nonsuppressible Insulin-Like and Cell-Growth-Promoting Activities: Evidence for Structural Homology with Insulin B Chain

The amino-terminal sequences of two polypeptides with nonsuppressible insulin-like and cell-growth-promoting activities (NSILA I and II), isolated from human serum, were determined. Of the first 31 residues, 22 are identical in NSILA I and II. Moreover, a striking structural similarity was found bet...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 73; no. 12; pp. 4379 - 4381
Main Authors Rinderknecht, Ernst, Humbel, René E.
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences of the United States of America 01.12.1976
National Acad Sciences
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Abstract The amino-terminal sequences of two polypeptides with nonsuppressible insulin-like and cell-growth-promoting activities (NSILA I and II), isolated from human serum, were determined. Of the first 31 residues, 22 are identical in NSILA I and II. Moreover, a striking structural similarity was found between NSILA and insulin B chain: 47 and 57% of residues 1-30 in NSILA I are identical to those in insulin B chain from man and tuna fish, respectively. This high degree of sequence identity is presented as evidence for homology and thus for a common evolutionary origin of insulin and NSILA. Based on these results and on biological properties of NSILA described earlier, a new designation for NSILA is proposed: insulin-like growth factor (IGF).
AbstractList The amino-terminal sequences of two polypeptides with nonsuppressible insulin-like and cell-growth-promoting activities (NSILA I and II), isolated from human serum, were determined. Of the first 31 residues, 22 are identical in NSILA I and II. Moreover, a striking structural similarity was found between NSILA and insulin B chain: 47 and 57% of residues 1-30 in NSILA I are identical to those in insulin B chain from man and tuna fish, respectively. This high degree of sequence identity is presented as evidence for homology and thus for a common evolutionary origin of insulin and NSILA. Based on these results and on these results and on biological properties of NSILA described earlier, a new designation for NSILA is proposed: insulin-like growth factor (IGF).
The amino-terminal sequences of two polypeptides with nonsuppressible insulin-like and cell-growth-promoting activities (NSILA I and II), isolated from human serum, were determined. Of the first 31 residues, 22 are identical in NSILA I and II. Moreover, a striking structural similarity was found between NSILA and insulin B chain: 47 and 57% of residues 1-30 in NSILA I are identical to those in insulin B chain from man and tuna fish, respectively. This high degree of sequence identity is presented as evidence for homology and thus for a common evolutionary origin of insulin and NSILA. Based on these results and on biological properties of NSILA described earlier, a new designation for NSILA is proposed: insulin-like growth factor (IGF).
Author Humbel, René E.
Rinderknecht, Ernst
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SubjectTerms Amino Acid Sequence
Amino acids
Autoanalysis
Biochemistry
Cell growth
Growth Substances - analysis
Human growth
Humans
Insulin
Insulin - analysis
Insulin like effects
Molecules
Nonsuppressible Insulin-Like Activity - analysis
Sequencing
Somatomedins
Tuna
Title Amino-Terminal Sequences of Two Polypeptides from Human Serum with Nonsuppressible Insulin-Like and Cell-Growth-Promoting Activities: Evidence for Structural Homology with Insulin B Chain
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http://www.pnas.org/content/73/12/4379.abstract
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