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Molecular Modeling of Disease Causing Mutations in Domain C1 of cMyBP-C

النمذجة الجزيئية للأمراض المسببة للطفرات في المجال C1 من cMyBP - C
Authors: Poornima Gajendrarao; Navaneethakrishnan Krishnamoorthy; Heba Sh. Kassem; Sarah Moharem-Elgamal; Fabiola Cecchi; Iacopo Olivotto; Magdi H. Yacoub;

Molecular Modeling of Disease Causing Mutations in Domain C1 of cMyBP-C

Abstract

La protéine C de liaison à la myosine cardiaque (cMyBP-C) est une protéine à plusieurs domaines (C0-C10) qui régule la contraction du muscle cardiaque par interaction avec la myosine, l'actine et d'autres protéines sarcomériques. Plusieurs mutations de cette protéine provoquent une cardiomyopathie hypertrophique familiale (CMH). Le domaine C1 de cMyBP-C joue un rôle central dans les interactions protéiques avec l'actine et la myosine. Ici, nous avons étudié la relation structure-fonction de trois mutations causant des maladies, Arg177His, Ala216Thr et Glu258Lys du domaine C1 en utilisant des techniques de biologie computationnelle avec sa structure cristalline aux rayons X disponible. Les résultats suggèrent que chaque mutation pourrait affecter les propriétés structurelles du domaine C1, et donc son intégrité structurelle en modifiant les arrangements intramoléculaires dans un mode distinct. Les mutations modifient également les distributions de charge de surface, ce qui pourrait avoir un impact sur la liaison de C1 avec d'autres protéines sarcomériques, affectant ainsi la fonction contractile. Ces conséquences structurelles des mutants C1 pourraient être utiles pour comprendre les mécanismes moléculaires de la maladie.

La proteína C de unión a la miosina cardíaca (cMyBP-C) es una proteína multidominio (C0-C10) que regula la contracción del músculo cardíaco a través de la interacción con la miosina, la actina y otras proteínas sarcoméricas. Varias mutaciones de esta proteína causan miocardiopatía hipertrófica familiar (MCH). El dominio C1 de cMyBP-C desempeña un papel central en las interacciones de las proteínas con la actina y la miosina. Aquí, estudiamos la relación estructura-función de tres mutaciones causantes de enfermedades, Arg177His, Ala216Thr y Glu258Lys del dominio C1 utilizando técnicas de biología computacional con su estructura cristalina de rayos X disponible. Los resultados sugieren que cada mutación podría afectar las propiedades estructurales del dominio C1 y, por lo tanto, su integridad estructural a través de la modificación de las disposiciones intramoleculares de un modo distinto. Las mutaciones también cambian las distribuciones de carga superficial, lo que podría afectar la unión de C1 con otras proteínas sarcoméricas, afectando así la función contráctil. Estas consecuencias estructurales de los mutantes C1 podrían ser valiosas para comprender los mecanismos moleculares de la enfermedad.

Cardiac myosin binding protein-C (cMyBP-C) is a multi-domain (C0-C10) protein that regulates heart muscle contraction through interaction with myosin, actin and other sarcomeric proteins. Several mutations of this protein cause familial hypertrophic cardiomyopathy (HCM). Domain C1 of cMyBP-C plays a central role in protein interactions with actin and myosin. Here, we studied structure-function relationship of three disease causing mutations, Arg177His, Ala216Thr and Glu258Lys of the domain C1 using computational biology techniques with its available X-ray crystal structure. The results suggest that each mutation could affect structural properties of the domain C1, and hence it's structural integrity through modifying intra-molecular arrangements in a distinct mode. The mutations also change surface charge distributions, which could impact the binding of C1 with other sarcomeric proteins thereby affecting contractile function. These structural consequences of the C1 mutants could be valuable to understand the molecular mechanisms for the disease.

البروتين المرتبط بالميوسين القلبي C (cMyBP - C) هو بروتين متعدد المجالات (C0 - C10) ينظم تقلص عضلة القلب من خلال التفاعل مع الميوسين والأكتين والبروتينات الساركوميرية الأخرى. تسبب العديد من الطفرات في هذا البروتين اعتلال عضلة القلب الضخامي العائلي (HCM). يلعب المجال C1 من cMyBP - C دورًا مركزيًا في تفاعلات البروتين مع الأكتين والميوسين. هنا، درسنا علاقة البنية والوظيفة لثلاثة طفرات مسببة للمرض، Arg177His و Ala216Thr و Glu258Lys من المجال C1 باستخدام تقنيات البيولوجيا الحسابية مع البنية البلورية للأشعة السينية المتاحة. تشير النتائج إلى أن كل طفرة يمكن أن تؤثر على الخصائص الهيكلية للمجال C1، وبالتالي فهي تكامل هيكلي من خلال تعديل الترتيبات داخل الجزيئات في وضع متميز. كما تغير الطفرات توزيعات الشحنة السطحية، والتي يمكن أن تؤثر على ارتباط C1 مع البروتينات الساركومية الأخرى وبالتالي تؤثر على وظيفة الانقباض. يمكن أن تكون هذه العواقب الهيكلية للطفرات C1 ذات قيمة لفهم الآليات الجزيئية للمرض.

Keywords

DYNAMICS, Models, Molecular, Protein domain, DNA Mutational Analysis, Molecular Mechanisms of Muscle Regeneration and Atrophy, Crystallography, X-Ray, Gene, Biochemistry, FAMILIAL HYPERTROPHIC CARDIOMYOPATHY, Familial, MYOSIN-BINDING, Models, CONTRACTION, THICK FILAMENTS, PHOSPHORYLATION, Crystallography, Cardiomyopathy, Hypertrophic, Familial; Carrier Proteins; Computational Biology; Crystallography, X-Ray; DNA Mutational Analysis; Egypt; Humans; Molecular Dynamics Simulation; Mutation, Missense; Static Electricity; Models, Molecular; Protein Structure, Tertiary, Diagnosis and Management of Arrhythmogenic Right Ventricular Cardiomyopathy, Q, R, Diagnosis and Management of Hypertrophic Cardiomyopathy, Life Sciences, MUSCLE, Multidisciplinary Sciences, Science & Technology - Other Topics, Medicine, Egypt, REGULATOR, Cardiology and Cardiovascular Medicine, Research Article, Protein Structure, Cell biology, Cardiomyopathy, General Science & Technology, Science, GENETIC-BASIS, Static Electricity, Mutation, Missense, Myosin, Molecular Dynamics Simulation, Binding site, Biochemistry, Genetics and Molecular Biology, MD Multidisciplinary, Health Sciences, Cardiomyopathy, Hypertrophic, Familial, Genetics, Humans, Cardiac Imaging, Molecular Biology, Biology, Actin, Science & Technology, MULTIDISCIPLINARY SCIENCES, Mutant, Molecular, Computational Biology, Binding domain, Protein Structure, Tertiary, Hypertrophic, FOS: Biological sciences, Mutation, X-Ray, BINDING-PROTEIN-C, Protein structure, Missense, Carrier Proteins, Tertiary

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
21
Top 10%
Top 10%
Top 10%
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