TY - JOUR
T1 - Characterization of two distinct gene transcripts for ribosomal protein L21 from pathogenic and nonpathogenic strains of Entamoeba histolytica
AU - Petter, Ram
AU - Moshitch, Sharon
AU - Rozenblatt, Shmuel
AU - Nuchamowitz, Yael
AU - Mirelman, David
N1 - Funding Information:
This investigationw as supportedb y a grant from the John D. and CatherineT . MacArthur Foundation.
PY - 1994/12/2
Y1 - 1994/12/2
N2 - A second gene (rp-L21) copy, clone g34, coding for ribosomal (r-) protein L21, was isolated from the pathogenic (P) strain HM-1:IMSS c16 of the intestinal parasite Entamoeba histolytica (Eh). The gene was compared to the previously isolated copy, gLE3 [Petter et al., Mol. Biochem. Parasitol. 56 (1992) 329-334], with respect to its primary structure, mRNA levels and binding to the r-complex during translation. Unlike the gLE3 gene copy [Petter et al., Mol. Biochem. Parasitol. 56 (1992) 329-334], g34 was found not to be physically connected to an actin gene copy. Homologous copies of the two rp-L21 genes were also characterized from the nonpathogenic (NP) strain SAW1734R clAR, as well as from its P derivative. Sequence comparison of the coding regions of the two rp-L21 revealed almost full identity. Significant differences were found, however, within their 3' and 5' flanking regions. Using the 3' rapid amplification of cDNA ends (3' RACE) method [Frohman et al., Proc. Natl. Acad. Sci. USA 85 (1988) 8998-9002], as well as Northern and slot blot hybridizations, it was demonstrated that both rp-L21 mRNAs are found in similar amounts. However, as was shown by differential hybridization, the relative binding of each transcript to the r-complex varied somewhat between P and NP strains. This finding suggests that the control of expression of rp-L21 in Eh may involve regulation at the post-transcriptional level.
AB - A second gene (rp-L21) copy, clone g34, coding for ribosomal (r-) protein L21, was isolated from the pathogenic (P) strain HM-1:IMSS c16 of the intestinal parasite Entamoeba histolytica (Eh). The gene was compared to the previously isolated copy, gLE3 [Petter et al., Mol. Biochem. Parasitol. 56 (1992) 329-334], with respect to its primary structure, mRNA levels and binding to the r-complex during translation. Unlike the gLE3 gene copy [Petter et al., Mol. Biochem. Parasitol. 56 (1992) 329-334], g34 was found not to be physically connected to an actin gene copy. Homologous copies of the two rp-L21 genes were also characterized from the nonpathogenic (NP) strain SAW1734R clAR, as well as from its P derivative. Sequence comparison of the coding regions of the two rp-L21 revealed almost full identity. Significant differences were found, however, within their 3' and 5' flanking regions. Using the 3' rapid amplification of cDNA ends (3' RACE) method [Frohman et al., Proc. Natl. Acad. Sci. USA 85 (1988) 8998-9002], as well as Northern and slot blot hybridizations, it was demonstrated that both rp-L21 mRNAs are found in similar amounts. However, as was shown by differential hybridization, the relative binding of each transcript to the r-complex varied somewhat between P and NP strains. This finding suggests that the control of expression of rp-L21 in Eh may involve regulation at the post-transcriptional level.
KW - Protozoan parasite
KW - crude ribosomal extracts
KW - intergenic regions
KW - polymerase chain reaction
KW - post-transcriptional regulation
KW - sequence alignment
UR - http://www.scopus.com/inward/record.url?scp=0028046736&partnerID=8YFLogxK
U2 - 10.1016/0378-1119(94)90881-8
DO - 10.1016/0378-1119(94)90881-8
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AN - SCOPUS:0028046736
SN - 0378-1119
VL - 150
SP - 181
EP - 186
JO - Gene
JF - Gene
IS - 1
ER -