Artículo
Production, homology modeling and mutagenesis studies on GlcH glucose transporter from Prochlorococcus sp. strain SS120
Moreno Cabezuelo, José Ángel; del Carmen Muñoz Marín, María; López Lozano, Antonio; Athayde, Diogo; Simón García, Ana; Díez, Jesús; Archer, Margarida; Issoglio, Federico Matías
; García Fernández, José Manuel
![Icon](/themes/CONICETDigital/images/conicet.png)
Fecha de publicación:
04/2023
Editorial:
Elsevier Science
Revista:
Biochimica Et Biophysica Acta-bioenergetics
ISSN:
0005-2728
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The marine cyanobacterium Prochlorococcus is one of the main primary producers on Earth, which can take up glucose by using the high affinity, multiphasic transporter GlcH. We report here the overexpression of glcH from Prochlorococcus marinus strain SS120 in Escherichia coli. Modeling studies of GlcH using the homologous MelB melibiose transporter from Salmonella enterica serovar Typhimurium showed high conservation at the overall fold. We observed that an important structural interaction, mediated by a strong hydrogen bond between D8 and R141, is conserved in Prochlorococcus, although the corresponding amino acids in MelB from Salmonella are different. Biased docking studies suggested that when glucose reaches the pocket of the transporter and interacts with D8 and R141, the hydrogen bond network in which these residues are involved could be disrupted, favoring a conformational change with the subsequent translocation of the glucose molecule towards the cytoplasmic region of the pmGlcH structure. Based on these theoretical predictions and on the conservation of N117 and W348 in other MelB structures, D8, N117, R141 and W348 were mutated to glycine residues. Their key role in glucose transport was evaluated by glucose uptake assays. N117G and W348G mutations led to 17 % decrease in glucose uptake, while D8G and R141G decreased the glucose transport by 66 % and 92 % respectively. Overall, our studies provide insights into the Prochlorococcus 3D-structure of GlcH, paving the way for further analysis to understand the features which are involved in the high affinity and multiphasic kinetics of this transporter.
Palabras clave:
CYANOBACTERIA
,
GLUCOSE
,
HOMOLOGY MODELING
,
MEMBRANE PROTEIN
,
TRANSPORT
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Articulos(IQUIBICEN)
Articulos de INSTITUTO DE QUIMICA BIOLOGICA DE LA FACULTAD DE CS. EXACTAS Y NATURALES
Articulos de INSTITUTO DE QUIMICA BIOLOGICA DE LA FACULTAD DE CS. EXACTAS Y NATURALES
Citación
Moreno Cabezuelo, José Ángel; del Carmen Muñoz Marín, María; López Lozano, Antonio; Athayde, Diogo; Simón García, Ana; et al.; Production, homology modeling and mutagenesis studies on GlcH glucose transporter from Prochlorococcus sp. strain SS120; Elsevier Science; Biochimica Et Biophysica Acta-bioenergetics; 1864; 2; 4-2023; 1-11
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