4 research outputs found
EL SILENCIO EN EL MONSTRUO DEL MANZANARES
Este trabajo estudia la funciĂłn del silencio en la novela El monstruo del
Manzanares, novela corta incluida en la colección La mojiganga del gusto (1641) de Andrés
Sanz del Castillo. Esta novela posee constantes alusiones al silencio, las cuales, sumadas a la
ausencia de diálogos que reproduzcan las voces de los personajes, nos llevan a considerar, más
allá todavĂa, que el silencio configura un tema en sĂ mismo dentro de El monstruo de Manzanares
y determina notoriamente el sentido final de la novela
MOESM1 of Biochemical analysis and the preliminary crystallographic characterization of d-tagatose 3-epimerase from Rhodobacter sphaeroides
Additional file 1. Additional tables and figures
Engineering of Acid-Resistant d‑Allulose 3‑Epimerase for Functional Juice Production
d-Allulose, a rare sugar and functional sweetener,
can
be biosynthesized by d-allulose 3-isomerase (DAE). However,
most of the reported DAEs exhibit poor resistance under acidic conditions,
which severely limited their application. Here, surface charge engineering
and random mutagenesis were used to construct a mutant library of
CcDAE from Clostridium cellulolyticum H10, combined with high-throughput screening to identify mutants
with high activity and resistance under acidic conditions. The mutant
M3 (I114R/K123E/H209R) exhibited high activity (3.36-fold of wild-type)
and acid resistance (10.6-fold of wild-type) at pH 4.5. The structure–function
relationship was further analyzed by molecular dynamics (MD) simulations,
which indicated that M3 had a higher number of hydrogen bonds and
negative surface charges than the wild type. A multienzyme cascade
system including M3 was used to convert high-calorie sugars in acidic
juices, and functional juices containing 7.8–15.4 g/L d-allulose were obtained. Our study broadens the manufacture of functional
foods containing d-allulose
Computation-Aided Phylogeny-Oriented Engineering of β‑Xylosidase: Modification of “Blades” to Enhance Stability and Activity for the Bioconversion of Hemicellulose to Produce Xylose
Hemicellulose
is a highly abundant, ubiquitous, and renewable natural
polysaccharide, widely present in agricultural and forestry residues.
The enzymatic hydrolysis of hemicellulose has generally been accomplished
using β-xylosidases, but concomitantly increasing the stability
and activity of these enzymes remains challenging. Here, we rationally
engineered a β-xylosidase from Bacillus clausii to enhance its stability by computation-aided design combining ancestral
sequence reconstruction and structural analysis. The resulting combinatorial
mutant rXYLOM25I/S51L/S79E exhibited highly improved robustness,
with a 6.9-fold increase of the half-life at 60 °C, while also
exhibiting improved pH stability, catalytic efficiency, and hydrolytic
activity. Structural analysis demonstrated that additional interactions
among the propeller blades in the catalytic module resulted in a much
more compact protein structure and induced the rearrangement of the
opposing catalytic pocket to mediate the observed improvement of activity.
Our work provides a robust biocatalyst for the hydrolysis of agricultural
waste to produce various high-value-added chemicals and biofuels