The multiple dissociation constants of glutathione disulfide: interpreting experimental pH-titration curves with ab initio MD simulations

Literature Information

Publication Date 2019-04-09
DOI 10.1039/C9CP00761J
Impact Factor 3.676
Authors

Vaishali Arunachalam, Anil Kumar Tummanapelli, Sukumaran Vasudevan


View Original

Abstract

The hexapeptide glutathione disulfide (GSSG) has six ionizable groups with six associated dissociation constants. The experimentally measured pH-titration curve, however, does not exhibit the six corresponding equivalence points and bears little resemblance to standard textbook examples of acid–base pH-titration curves. The curve highlights the difficulties in determining multiple pKa values of polyprotic acids – typically proteins and peptides – from experiment. The six pKa values of GSSG can, however, be estimated using Car–Parrinello molecular dynamics (CPMD) simulations in conjunction with metadynamics sampling of the underlying free energy landscape of the dissociation reactions. Ab initio MD simulations were performed on a GSSG molecule solvated by 200 water molecules. Using the estimated pKa values the theoretical titration curve was calculated and found to be in good agreement with experiment. The results clearly highlight how dissociation constants estimated from ab initio MD simulations can facilitate the interpretation of the pH-titration curves of complex chemical and biological systems.

Related Literature

Selective fluorometric detection of pyrophosphate by interaction with alizarin red S–dimethyltin(iv) complex

Raul Villamil-Ramos, Anatoly K. Yatsimirsky

2011-01-13 Communication

DOI: 10.1039/C0CC05346E

High sensitivity and rapid detection of hepatitis B virus DNA using lateral flow biosensors based on Au@Pt nanorods in the absence of hydrogen peroxide

Niu Li, Xiaoxue Xi, Junlun Zhu, Xiaowei Wu, Xiuhua Zhang, Shengfu Wang, Wei Wen

2021-12-21 Paper

DOI: 10.1039/D1AN02084F

A colorimetric sensor array for rapid discrimination of edible oil species based on a halogen ion exchange reaction between CsPbBr3 and iodide

Xin Zhang, Xiaowei Feng, Leon Lee Zhou, Bin Liu, Zhengbo Chen, Xia Zuo

2021-12-13 Paper

DOI: 10.1039/D1AN02109E

A homogeneous digital biosensor for circulating tumor DNA by the enumeration of a dual-color quantum dot complex

Xiaojun Liu, Zhangjian Wu, Xinyi Lin, Wei Bu, Lei Qin, Hongwei Gai

2021-03-18 Paper

DOI: 10.1039/D1AN00299F

Contents list

Front/Back Matter

DOI: 10.1039/C9AN90014D

Front cover

Cover

DOI: 10.1039/C3CE90016A

Electroanalytical overview: the pungency of chile and chilli products determined via the sensing of capsaicinoids

Robert D. Crapnell, Craig E. Banks

2021-03-11 Critical Review

DOI: 10.1039/D1AN00086A

A comparison of electron density from Hirshfeld-atom refinement, X-ray wavefunction refinement and multipole refinement on three urea derivatives

Lilianna Chęcińska, Wolfgang Morgenroth, Carsten Paulmann, Dylan Jayatilaka, Birger Dittrich

2012-12-21 Paper

DOI: 10.1039/C2CE26964C

Correction: Two-dimensional conjugated metal–organic frameworks (2D c-MOFs): chemistry and function for MOFtronics

Mingchao Wang, Renhao Dong, Xinliang Feng

2022-01-14 Correction

DOI: 10.1039/D2CS90005J

A ratiometric fluorescence strategy based on polyethyleneimine surface-modified carbon dots and Eosin Y for the ultrasensitive determination of protamine and trypsin

Wenying Sun, Feng Zhang, Mengke Wang, Nan Wang, Guannan Wang, Xingguang Su

2021-12-31 Paper

DOI: 10.1039/D1AN02138A

You might also like

Compound Q&A

How is Ethyl 4-chlorothieno[2,3-b]pyridine-5-carboxylate (CAS: 59713-58-5) typically synthesized?

Ethyl 4-chlorothieno[2,3-b]pyridine-5-carboxylate (CAS: 59713-58-5) can be synth...

59713-58-5Ethyl 4-chlorothieno...
Compound Q&A

What regulatory guidelines apply to 5-Methyl-1H-indole-3-carbaldehyde (CAS: 52562-50-2)?

5-Methyl-1H-indole-3-carbaldehyde (CAS: 52562-50-2) is subject to various regula...

52562-50-25-Methyl-1H-indole-3...
Compound Q&A

What are the physical and chemical properties of (1,3-Dimethyl-2,4-dioxo-1,2,3,4-tetrahydro-5-pyrimidinyl)boronic acid (CAS: 223418-73-3)?

(1,3-Dimethyl-2,4-dioxo-1,2,3,4-tetrahydro-5-pyrimidinyl)boronic acid is a white...

223418-73-3(1,3-Dimethyl-2,4-di...
Compound Q&A

How should waste containing Sulfocostunolide A (CAS: 1016983-51-9) be handled?

Waste containing Sulfocostunolide A (CAS: 1016983-51-9) should be handled with c...

1016983-51-9Sulfocostunolide A
Compound Q&A

What precautions should be taken when handling Murraxocin (CAS: 88478-44-8)?

When handling Murraxocin (CAS: 88478-44-8), ensure proper personal protective eq...

88478-44-8Murraxocin
Compound Q&A

What are the physical and chemical properties of Formvar (CAS: 63148-64-1)?

Formvar (CAS: 63148-64-1) is an alkyd resin characterized by a high molecular we...

63148-64-1Formvar(R)
Compound Q&A

Is (S)-4-benzyl-2-((benzyloxy)methyl)morpholine (CAS: 205242-66-6) safe?

(S)-4-benzyl-2-((benzyloxy)methyl)morpholine is generally safe when handled with...

205242-66-6(S)-4-benzyl-2-((ben...
Compound Q&A

What industries use Methyl 1-(5-bromo-2-pyrimidinyl)cyclopropanecarboxylate (CAS: 1447607-69-3)?

Methyl 1-(5-bromo-2-pyrimidinyl)cyclopropanecarboxylate (CAS: 1447607-69-3) is p...

1447607-69-3Methyl 1-(5-bromo-2-...
Compound Q&A

Is 2-Methyl-1-phenyl-1-propanamine hydrochloride (CAS: 24290-47-9) safe?

2-Methyl-1-phenyl-1-propanamine hydrochloride (CAS: 24290-47-9) is generally con...

24290-47-92-Methyl-1-phenyl-1-...
Compound Q&A

How is 3-(4-Bromophenyl)-2-methylpropanoic acid (CAS: 66735-01-1) typically synthesized?

3-(4-Bromophenyl)-2-methylpropanoic acid is synthesized through a multi-step pro...

66735-01-13-(4-Bromophenyl)-2-...

Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

Recommended Compounds

Recommended Suppliers

Disclaimer
This page provides academic journal information for reference and research purposes only. We are not affiliated with any journal publishers and do not handle publication submissions. For publication-related inquiries, please contact the respective journal publishers directly.
If you notice any inaccuracies in the information displayed, please contact us at support@chemtradehub.com. We will promptly review and address your concerns.