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Author: search.filters.author.González-Paz, LeninHas files: Yes

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    Relationship between Hydration and Catalytic Activity of Endonucleases: The Case of Cas9 and Its Evolutionary Variants
    (Pleiades Publishing Ltd, 2025)
    Alvarado, Ysaías J.
    ;
    Vivas, Alejandro
    ;
    Méndez, Anibal
    ;
    Rodríguez-Lugo, Patricia
    ;
    Troconis, María Elena
    This study examined the structures of SpCas9 endonuclease of Streptococcus pyogenes and their evolutionary variants using different computational biophysical models to investigate the behavior of hydration in these endonucleases. Although the mechanism of SpCas9 is well understood from an evolutionary perspective, its hydration has not been thoroughly explored. The study found that all endonucleases tended to compact together and expose less surface area to water as a solvent, resulting in a significant loss of water molecules from the hydration layer, as occurs in the folding of many globular proteins. A comparative analysis revealed that the distribution of water molecules in the hydration shell and PI domain, which is responsible for the biological recognition function of ligand, differed between each endonuclease. All endonucleases have a higher density in their hydration shell in relation to the density of water as a solvent, with SpCas9 having the highest density in the hydration shell (19%) and the lowest being the primitive endonuclease SCA (4%) in relation to the bulk water. The previously reported catalytic activity of these endonucleases toward the OCA2 and TYR genes increased nonlinearly with both maximum of probability density of the number of water molecules and the degree of hydration in the evolutionary direction from the oldest to the current. These findings suggest that water molecules in the hydration shell play an important role in the conformational changes, biological recognition, and activity of this endonuclease of great biotechnological interest. ©The authors ©Springer.
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    Modeling the functional impact of CPEB3 and CPEB4 dysregulation in autism: A theoretical–computational framework
    (Elsevier BV, 2026)
    González-Paz, Lenin
    ;
    Vivas, Alejandro
    ;
    Cardozo-Urdaneta, Arlene
    ;
    Lossada, Carla
    ;
    Mendez, Anibal
    Autism spectrum disorder (ASD) involves impaired synaptic plasticity tightly coupled to local mRNA translation. Cytoplasmic polyadenylation element-binding proteins 3 and 4 (CPEB3 and CPEB4) are post-transcriptional regulators of neuronal mRNA translation that may contribute to ASD-related molecular alterations. In this theoretical–computational study, we develop a weighted functional impact model that integrates transcriptomic expression with intrinsic molecular constraints of CPEB3 and CPEB4 to estimate regional and cell type–specific vulnerability in ASD. Coarse-grained molecular dynamics (MD) simulations were quantitatively analyzed to assess aggregation, diffusion, and cluster stability under cell type–specific cytoplasmic conditions, with statistical uncertainty explicitly evaluated. The anterior cingulate cortex and thalamus emerged as primary vulnerability sites. Despite higher CPEB4 expression—mainly in glial cells—our weighted functional impact model predicted greater theoretical susceptibility linked to CPEB3 dysfunction, particularly in inhibitory and excitatory neurons. MD simulations revealed that CPEB3 forms transient diffusion-permissive aggregates, whereas CPEB4 tends to assemble into more stable condensates. These complementary behaviors suggest differential but interdependent regulation of neuronal and glial functions. Importantly, the proposed framework provides experimentally testable predictions on how protein–protein interactions, microexon loss, and cytoplasmic crowding influence translational control in ASD. This integrative approach provides a quantitative and biologically grounded framework to investigate how post-transcriptional regulators contribute to ASD-relevant molecular vulnerability. ©The authors ©Sciencedirect ©Elsevier.