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Dipeptidyl Peptidase 4 Inhibitors

Dipeptidyl Peptidase 4 Inhibitors

Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a significant...

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Updated: Jun 5, 2026

Visualizing Cellular Gibberellin Levels Using the nlsGPS1 Förster Resonance Energy Transfer (FRET) Biosensor

Visualizing Cellular Gibberellin Levels Using the nlsGPS1 Förster Resonance Energy Transfer (FRET) Biosensor

Published on: January 12, 2019

Gibberellin A4 monohydrate.

Yun-Fen Hua¹, Hai Yan Li, Lin Lin Ma

¹College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online

|January 5, 2011

Summary

This summary is machine-generated.

This study details the crystal structure of a gibberellin A4 hydrate compound, revealing specific molecular conformations and hydrogen bonding interactions. Understanding these structural details is key for plant hormone research.

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Area of Science:

Crystallography
Plant Science
Organic Chemistry

Background:

Gibberellins are crucial plant hormones regulating growth and development.
Understanding the precise molecular structure of gibberellins is essential for elucidating their biological functions.
Gibberellin A4 (GA4) is a significant endogenous gibberellin in many plant species.

Purpose of the Study:

To determine the crystal structure of a gibberellin A4 hydrate compound.
To analyze the molecular conformation and intermolecular interactions within the crystal lattice.
To provide detailed structural insights into gibberellin A4.

Main Methods:

Single crystal X-ray diffraction was employed to analyze the crystal structure.
The molecular geometry, including ring conformations, was determined.
Intermolecular interactions, such as hydrogen bonds, were identified and characterized.

Main Results:

The crystal structure of C(19)H(24)O(5)·H(2)O was elucidated, containing two gibberellin A4 and two water molecules in the asymmetric unit.
The A and B rings exhibit chair conformations, while the C and D rings adopt envelope conformations.
The crystal lattice is stabilized by a network of O-H⋯O and C-H⋯O hydrogen bonds.

Conclusions:

The study provides a precise three-dimensional structure of gibberellin A4 hydrate.
The identified hydrogen bonding network plays a critical role in the crystal packing and stability.
These structural findings contribute to a deeper understanding of gibberellin structure-activity relationships.