Biomaterial Database

Cloning and function analysis of full-length cDNA sequence of Schistosoma japonicum eukaryotic translation initiation factor 2 alpha subunit. 2003

Xiao-zhao Lu, and Hong-juan Peng, and Xiao-guang Chen

Department of Parasitology, First Military Medical University, Guangzhou 510515, China.

OBJECTIVE To subclone the novel gene screened from the Schistosoma japonicum cercariae cDNA library through expressed sequence tag (EST) strategy and analyze its functions. METHODS The cDNA fragment inserted in pTriplEx2 vector was sequenced and the result retrieved with BLASTn program. It was found that this cDNA was highly homologous to Schistosoma mansoni eukaryotic translation initiation factor 2 alpha subunit (eIF2 alpha) mRNA. According to the known EST sequence, the 3'-terminal primer that matched the sequencing primer for the 5'-terminal in pTriplEx2 plasmid was designed and used to amplify the full-length open reading frame (ORF) sequence of the eIF2 alpha from the cDNA Library. After proper purification, the PCR product was linked to pGEM-T vector and the recombinant T-vector was sequenced to obtain the full length ORF, which was retrieved for homologue identification using NCBI blast program. The sequences that were highly homologous underwent comparison at the levels of amino acids and nucleotides using BLAST 2 Sequence program on NCBI BLAST site. The motif and conserved domain were also retrieved with the software available online. RESULTS A novel cDNA sequence coding for a eIF2 alpha was found from the cDNA library of Schistosoma japonicum cercariae, which was highly homologous to the known Schistosoma mansoni eIF2 alpha mRNA, with the homology of 87% at the nucleotide level and 79% at the amino acid level. CONCLUSIONS The novel gene found by EST strategy may encode a eIF2 alpha which is highly homologous to Schistosoma mansoni eukaryotic eIF2 alpha mRNA.

UI	MeSH Term	Description	Entries
D008969	Molecular Sequence Data	Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.	Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D003001	Cloning, Molecular	The insertion of recombinant DNA molecules from prokaryotic and/or eukaryotic sources into a replicating vehicle, such as a plasmid or virus vector, and the introduction of the resultant hybrid molecules into recipient cells without altering the viability of those cells.	Molecular Cloning
D000595	Amino Acid Sequence	The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.	Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D001483	Base Sequence	The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.	DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA
D012549	Schistosoma japonicum	A species of trematode blood flukes belonging to the family Schistosomatidae whose distribution is confined to areas of the ASIA, EASTERN. The intermediate host is a snail. It occurs in man and other mammals.	Schistosoma japonicums,japonicum, Schistosoma
D012689	Sequence Homology, Nucleic Acid	The sequential correspondence of nucleotides in one nucleic acid molecule with those of another nucleic acid molecule. Sequence homology is an indication of the genetic relatedness of different organisms and gene function.	Base Sequence Homology,Homologous Sequences, Nucleic Acid,Homologs, Nucleic Acid Sequence,Homology, Base Sequence,Homology, Nucleic Acid Sequence,Nucleic Acid Sequence Homologs,Nucleic Acid Sequence Homology,Sequence Homology, Base,Base Sequence Homologies,Homologies, Base Sequence,Sequence Homologies, Base
D015852	Eukaryotic Initiation Factor-2	Eukaryotic initiation factor of protein synthesis. In higher eukaryotes the factor consists of three subunits: alpha, beta, and gamma. As initiation proceeds, eIF-2 forms a ternary complex with Met-tRNAi and GTP.	EIF-2,Peptide Initiation Factor EIF-2,EIF-2 alpha,EIF-2 beta,EIF-2 gamma,EIF-2alpha,EIF-2beta,EIF-2gamma,EIF2,Eukaryotic Initiation Factor-2, alpha Subunit,Eukaryotic Initiation Factor-2, beta Subunit,Eukaryotic Initiation Factor-2, gamma Subunit,Eukaryotic Peptide Initiation Factor-2,EIF 2,EIF 2 alpha,EIF 2 beta,EIF 2 gamma,EIF 2alpha,EIF 2beta,EIF 2gamma,Eukaryotic Initiation Factor 2,Eukaryotic Initiation Factor 2, alpha Subunit,Eukaryotic Initiation Factor 2, beta Subunit,Eukaryotic Initiation Factor 2, gamma Subunit,Eukaryotic Peptide Initiation Factor 2,Initiation Factor-2, Eukaryotic,Peptide Initiation Factor EIF 2
D017386	Sequence Homology, Amino Acid	The degree of similarity between sequences of amino acids. This information is useful for the analyzing genetic relatedness of proteins and species.	Homologous Sequences, Amino Acid,Amino Acid Sequence Homology,Homologs, Amino Acid Sequence,Homologs, Protein Sequence,Homology, Protein Sequence,Protein Sequence Homologs,Protein Sequence Homology,Sequence Homology, Protein,Homolog, Protein Sequence,Homologies, Protein Sequence,Protein Sequence Homolog,Protein Sequence Homologies,Sequence Homolog, Protein,Sequence Homologies, Protein,Sequence Homologs, Protein
D017422	Sequence Analysis, DNA	A multistage process that includes cloning, physical mapping, subcloning, determination of the DNA SEQUENCE, and information analysis.	DNA Sequence Analysis,Sequence Determination, DNA,Analysis, DNA Sequence,DNA Sequence Determination,DNA Sequence Determinations,DNA Sequencing,Determination, DNA Sequence,Determinations, DNA Sequence,Sequence Determinations, DNA,Analyses, DNA Sequence,DNA Sequence Analyses,Sequence Analyses, DNA,Sequencing, DNA