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Exhaustive Analysis of the Modular Structure of the Spliceosomal Assembly Network: A Petri Net Approach


ABSTRACT: We designed a structured model of spliceosome assembly, which combines the demands on a platform that i) can display involved factors and concurrent processes, ii) offers the possibility to run computational methods for knowledge extraction, and iii) is successively extendable as new insights into spliceosome function are reported by experimental reports. The network consists of 161 transitions (reactions) and 140 places (reactants). All reactions are part of at least one of the 71 T-invariants. These T-invariants define pathways, which are in good agreement with the current knowledge and known hypotheses on reaction sequences during spliceosome assembly, hence contributing to a functional spliceosome. We demonstrate that present knowledge, in particular of the initial part of the assembly process, describes parallelism and interaction of signaling routes, which indicate functional redundancy and reflect the dependency of spliceosome assembly initiation on different cellular conditions.

SUBMITTER: Maria Papageorgopoulou  

PROVIDER: MODEL2406180001 | BioModels | 2024-06-19

REPOSITORIES: BioModels

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Publications

Combined biochemical and electron microscopic analyses reveal the architecture of the mammalian U2 snRNP.

Krämer A A   Grüter P P   Gröning K K   Kastner B B  

The Journal of cell biology 19990601 7


The 17S U2 small nuclear ribonucleoprotein particle (snRNP) represents the active form of U2 snRNP that binds to the pre-mRNA during spliceosome assembly. This particle forms by sequential interactions of splicing factors SF3b and SF3a with the 12S U2 snRNP. We have purified SF3b and the 15S U2 snRNP, an intermediate in the assembly pathway, from HeLa cell nuclear extracts and show that SF3b consists of four subunits of 49, 130, 145, and 155 kD. Biochemical analysis indicates that both SF3b and  ...[more]

Publication: 1/26

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