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Related Concept Videos

Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
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Introduction to Mechanisms of Enzyme Catalysis01:13

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes a mild...
Introduction to Mechanisms of Enzyme Catalysis01:13

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes a mild...
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Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion. The...

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Updated: May 7, 2026

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds
08:23

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

Published on: February 16, 2022

How does catalase release nitric oxide? A computational structure-activity relationship study.

Sai Lakshmana Vankayala1, Jacqueline C Hargis, H Lee Woodcock

  • 1Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, CHE205, Tampa, Florida 33620-5250, United States.

Journal of Chemical Information and Modeling
|October 4, 2013
PubMed
Summary
This summary is machine-generated.

Hydroxyurea (HU) is a sickle cell disease treatment that generates nitric oxide (NO). This study used computational methods to reveal how HU interacts with catalase, detailing the atomic mechanisms of NO release for future drug design.

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Area of Science:

  • Biochemistry
  • Computational Chemistry
  • Pharmacology

Background:

  • Hydroxyurea (HU) is the sole FDA-approved medication for adult sickle cell disease (SCD).
  • HU elevates nitric oxide (NO) levels, promoting fetal hemoglobin (HbF) production, a key therapeutic effect in SCD.
  • The precise mechanism of NO generation from HU, particularly its redox interactions with enzymes like catalase, is not fully understood.

Purpose of the Study:

  • To elucidate the atomic-level details of hydroxyurea's conversion to nitric oxide (NO) via interaction with catalase.
  • To investigate the binding modes of HU analogs with catalase compound I to identify key features for NO release.
  • To provide insights for structure-based drug design of novel HU-based therapeutics for sickle cell disease.

Main Methods:

  • Employed flexible receptor-flexible substrate induced fit docking (IFD) to model substrate binding.
  • Utilized energy decomposition analyses to examine atomic interactions and reaction mechanisms.
  • Investigated the binding orientations of nine hydroxyurea analogs with human catalase compound I.

Main Results:

  • Identified three primary binding orientations of hydroxyurea analogs with catalase compound I.
  • Revealed that specific hydrogen bonding interactions with distal residues (His75, Asn148, Gln168) and the oxoferryl-heme stabilize key anion/radical intermediates.
  • These interactions are crucial for the proposed mechanisms of NO production from hydroxyurea.

Conclusions:

  • The study provides a detailed atomic-level understanding of a critical step in hydroxyurea's conversion to nitric oxide.
  • Key stabilizing interactions for reaction intermediates have been identified, offering targets for drug design.
  • Findings contribute to a clearer mechanistic picture of HU's action and inform future structure-based drug discovery for sickle cell disease.