NMR and alanine scan studies of glucose-dependent insulinotropic polypeptide in water

I Alana, JC Parker, Victor Gault, Peter Flatt, Finbarr O'Harte, JPG Malthouse, CM Hewage

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Glucose-dependent insulinotropic polypeptide ( GIP) is an incretin hormone that stimulates the secretion of insulin after ingestion of food. GIP also promotes the synthesis of fatty acids in adipose tissue. Therefore, it is not surprising that numerous literature reports have shown that GIP is linked to diabetes and obesity-related diseases. In this study, we present the solution structure of GIP in water determined by NMR spectroscopy. The calculated structure is characterized by the presence of an alpha-helical motif between residues Ser11 and Gln29. The helical conformation of GIP is further supported by CD spectroscopic studies. Six GIP-( 1-42) Ala(1-7) analogues were synthesized by replacing individual N-terminal residues with alanine. Alanine scan studies of these N-terminal residues showed that the GIP-( 1-42) Ala(6) was the only analogue to show insulin-secreting activity similar to that of the native GIP. However, when compared with glucose, its insulinotropic ability was reduced. For the first time, these NMR and modeling results contribute to the understanding of the structural requirements for the biological activity of GIP.
LanguageEnglish
Pages16370-16376
JournalJournal of Biological Chemistry
Volume281
Issue number24
DOIs
Publication statusPublished - Jun 2006

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Alanine
Nuclear magnetic resonance
Glucose
Peptides
Water
Insulin
Incretins
Medical problems
Bioactivity
Nuclear magnetic resonance spectroscopy
Conformations
Fatty Acids
Hormones
Tissue

Cite this

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title = "NMR and alanine scan studies of glucose-dependent insulinotropic polypeptide in water",
abstract = "Glucose-dependent insulinotropic polypeptide ( GIP) is an incretin hormone that stimulates the secretion of insulin after ingestion of food. GIP also promotes the synthesis of fatty acids in adipose tissue. Therefore, it is not surprising that numerous literature reports have shown that GIP is linked to diabetes and obesity-related diseases. In this study, we present the solution structure of GIP in water determined by NMR spectroscopy. The calculated structure is characterized by the presence of an alpha-helical motif between residues Ser11 and Gln29. The helical conformation of GIP is further supported by CD spectroscopic studies. Six GIP-( 1-42) Ala(1-7) analogues were synthesized by replacing individual N-terminal residues with alanine. Alanine scan studies of these N-terminal residues showed that the GIP-( 1-42) Ala(6) was the only analogue to show insulin-secreting activity similar to that of the native GIP. However, when compared with glucose, its insulinotropic ability was reduced. For the first time, these NMR and modeling results contribute to the understanding of the structural requirements for the biological activity of GIP.",
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NMR and alanine scan studies of glucose-dependent insulinotropic polypeptide in water. / Alana, I; Parker, JC; Gault, Victor; Flatt, Peter; O'Harte, Finbarr; Malthouse, JPG; Hewage, CM.

In: Journal of Biological Chemistry, Vol. 281, No. 24, 06.2006, p. 16370-16376.

Research output: Contribution to journalArticle

TY - JOUR

T1 - NMR and alanine scan studies of glucose-dependent insulinotropic polypeptide in water

AU - Alana, I

AU - Parker, JC

AU - Gault, Victor

AU - Flatt, Peter

AU - O'Harte, Finbarr

AU - Malthouse, JPG

AU - Hewage, CM

PY - 2006/6

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AB - Glucose-dependent insulinotropic polypeptide ( GIP) is an incretin hormone that stimulates the secretion of insulin after ingestion of food. GIP also promotes the synthesis of fatty acids in adipose tissue. Therefore, it is not surprising that numerous literature reports have shown that GIP is linked to diabetes and obesity-related diseases. In this study, we present the solution structure of GIP in water determined by NMR spectroscopy. The calculated structure is characterized by the presence of an alpha-helical motif between residues Ser11 and Gln29. The helical conformation of GIP is further supported by CD spectroscopic studies. Six GIP-( 1-42) Ala(1-7) analogues were synthesized by replacing individual N-terminal residues with alanine. Alanine scan studies of these N-terminal residues showed that the GIP-( 1-42) Ala(6) was the only analogue to show insulin-secreting activity similar to that of the native GIP. However, when compared with glucose, its insulinotropic ability was reduced. For the first time, these NMR and modeling results contribute to the understanding of the structural requirements for the biological activity of GIP.

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