The three-dimensional organization of chromatin is influenced by chromatin-binding proteins through both specific and non-specific interactions. However, the roles of chromatin sequence and the interactions between binding proteins in shaping chromatin structure remain elusive. By employing a simple polymer-based model of chromatin that explicitly considers sequence-dependent protein binding and protein–protein interactions, we elucidate a mechanism for chromatin organization. We find that tuning protein–protein interactions and protein concentration is sufficient to either promote or inhibit chromatin compartmentalization. Moreover, chromatin sequence and protein–protein attraction strongly affect the structural and dynamic exponents that describe the spatiotemporal organization of chromatin. Strikingly, our model’s predictions for the exponents governing chromatin structure and dynamics successfully capture experimental observations, in sharp contrast to previous chromatin models. Overall, our findings have the potential to reinterpret data obtained from various chromosome conformation capture technologies, laying the groundwork for advancing our understanding of chromatin organization.
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7 October 2024
Research Article|
October 01 2024
Role of protein–protein interactions on organization and dynamics of a model chromatin Available to Purchase
Special Collection:
Chromatin Structure and Dynamics: Recent Advancements
Pinaki Swain
;
Pinaki Swain
a)
(Conceptualization, Data curation, Formal analysis, Investigation, Writing – original draft, Writing – review & editing)
1
The Institute of Mathematical Sciences, C.I.T. Campus
, Taramani, Chennai 600113, India
2
Homi Bhabha National Institute, Training School Complex
, Anushakti Nagar, Mumbai 400094, India
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Sandeep Choubey
;
Sandeep Choubey
b)
(Conceptualization, Methodology, Project administration, Supervision, Writing – original draft, Writing – review & editing)
1
The Institute of Mathematical Sciences, C.I.T. Campus
, Taramani, Chennai 600113, India
2
Homi Bhabha National Institute, Training School Complex
, Anushakti Nagar, Mumbai 400094, India
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Satyavani Vemparala
Satyavani Vemparala
c)
(Conceptualization, Methodology, Project administration, Supervision, Writing – original draft, Writing – review & editing)
1
The Institute of Mathematical Sciences, C.I.T. Campus
, Taramani, Chennai 600113, India
2
Homi Bhabha National Institute, Training School Complex
, Anushakti Nagar, Mumbai 400094, India
c)Author to whom correspondence should be addressed: [email protected]
Search for other works by this author on:
Pinaki Swain
1,2,a)
Sandeep Choubey
1,2,b)
Satyavani Vemparala
1,2,c)
1
The Institute of Mathematical Sciences, C.I.T. Campus
, Taramani, Chennai 600113, India
2
Homi Bhabha National Institute, Training School Complex
, Anushakti Nagar, Mumbai 400094, India
c)Author to whom correspondence should be addressed: [email protected]
a)
Electronic mail: [email protected]
b)
Electronic mail: [email protected]
J. Chem. Phys. 161, 134901 (2024)
Article history
Received:
June 10 2024
Accepted:
September 18 2024
Citation
Pinaki Swain, Sandeep Choubey, Satyavani Vemparala; Role of protein–protein interactions on organization and dynamics of a model chromatin. J. Chem. Phys. 7 October 2024; 161 (13): 134901. https://doi.org/10.1063/5.0222708
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