TY - JOUR
T1 - Amino acid residues Leu135 and Tyr236 are required for RNA binding activity of CFIm25 in Entamoeba histolytica
AU - Ospina-Villa, Juan David
AU - Zamorano-Carrillo, Absalom
AU - Lopez-Camarillo, Cesar
AU - Castañon-Sanchez, Carlos A.
AU - Soto-Sanchez, Jacqueline
AU - Ramirez-Moreno, Esther
AU - Marchat, Laurence A.
N1 - Publisher Copyright:
© 2015 Elsevier B.V. and Société Française de Biochimie et Biologie Moléculaire (SFBBM) © 2015 Elsevier B.V. and Société Française de Biochimie et Biologie Moléculaire (SFBBM). All rights reserved.
PY - 2015/8/1
Y1 - 2015/8/1
N2 - Pre-mRNA 3′ end processing in the nucleus is essential for mRNA stability, efficient nuclear transport, and translation in eukaryotic cells. In Human, the cleavage/polyadenylation machinery contains the 25 kDa subunit of the Cleavage Factor Im (CFIm25), which specifically recognizes two UGUA elements and regulates the assembly of polyadenylation factors, poly(A) site selection and polyadenylation. In Entamoeba histolytica, the protozoan parasite responsible for human amoebiasis, EhCFIm25 has been reported as a RNA binding protein that interacts with the Poly(A) Polymerase. Here, we follow-up with the study of EhCFIm25 to characterize its interaction with RNA. Using in silico strategy, we identified Leu135 and Tyr236 in EhCFIm25 as conserved amino acids among CFIm25 homologues. We therefore generated mutant EhCFIm25 proteins to investigate the role of these residues for RNA interaction. Results showed that RNA binding activity was totally abrogated when Leu135 and Tyr236 were replaced with Ala residue, and Tyr236 was changed for Phe. In contrast, RNA binding activity was less affected when Leu135 was substituted by Thr. Our data revealed for the first time -until we know-the functional relevance of the conserved Leu135 and Tyr236 in EhCFIm25 for RNA binding activity. They also gave some insights about the possible chemical groups that could be interacting with the RNA molecule.
AB - Pre-mRNA 3′ end processing in the nucleus is essential for mRNA stability, efficient nuclear transport, and translation in eukaryotic cells. In Human, the cleavage/polyadenylation machinery contains the 25 kDa subunit of the Cleavage Factor Im (CFIm25), which specifically recognizes two UGUA elements and regulates the assembly of polyadenylation factors, poly(A) site selection and polyadenylation. In Entamoeba histolytica, the protozoan parasite responsible for human amoebiasis, EhCFIm25 has been reported as a RNA binding protein that interacts with the Poly(A) Polymerase. Here, we follow-up with the study of EhCFIm25 to characterize its interaction with RNA. Using in silico strategy, we identified Leu135 and Tyr236 in EhCFIm25 as conserved amino acids among CFIm25 homologues. We therefore generated mutant EhCFIm25 proteins to investigate the role of these residues for RNA interaction. Results showed that RNA binding activity was totally abrogated when Leu135 and Tyr236 were replaced with Ala residue, and Tyr236 was changed for Phe. In contrast, RNA binding activity was less affected when Leu135 was substituted by Thr. Our data revealed for the first time -until we know-the functional relevance of the conserved Leu135 and Tyr236 in EhCFIm25 for RNA binding activity. They also gave some insights about the possible chemical groups that could be interacting with the RNA molecule.
KW - Cleavage factor Im
KW - Entamoeba histolytica
KW - Mutagenesis
KW - Polyadenylation
KW - RNA binding
UR - http://www.scopus.com/inward/record.url?scp=84929313057&partnerID=8YFLogxK
U2 - 10.1016/j.biochi.2015.04.017
DO - 10.1016/j.biochi.2015.04.017
M3 - Artículo
C2 - 25941172
SN - 0300-9084
VL - 115
SP - 44
EP - 51
JO - Biochimie
JF - Biochimie
ER -