- SECIS element
biology, the SECIS element (SECIS: "selenocysteine insertion sequence") is an RNA element around 60 nucleotidesin length that adopts a stem-loopstructure. [cite journal | last = Walczak | first = R | coauthors = Westhof E, Carbon P, Krol A | year = 1996 | title = A novel RNA structural motif in the selenocysteine insertion element of eukaryotic selenoprotein mRNAs | journal = RNA | volume = 2 | pages = 367–379 | pmid = 8634917] This structural motif (pattern of nucleotides) directs the cell to translate UGA codons as selenocysteines. (UGA is normally a stop codon.) SECIS elements are thus a fundamental aspect of selenoproteins, which are proteins that include one or more selenocysteine residues.
bacteriathe SECIS element appears soon after the UGA codon it affects. In archaeaand eukaryotes, it occurs in the 3' UTRof an mRNA, and can cause multiple UGA codons within the mRNA to code for selenocysteine. One archaeal SECIS element, in " Methanococcus," is located in the 5' UTR.
The SECIS element appears defined by sequence characteristics, i.e. particular nucleotides tend to be at particular positions in it, and a characteristic
secondary structure. The secondary structure is the result of base-pairing of complementary RNAnucleotides, and causes a hairpin-like structure. The eukaryotic SECIS element includes non-canonical A-G base pairs, which are uncommon in nature, but are critically important to correct SECIS element function. Although the eukaryotic, archaeal and bacterial SECIS elements each share a general hairpin structure, they are not alignable, e.g. a scheme to recognize eukaryotic SECIS elements will not be able to recognize archaeal SECIS elements.
bioinformatics, several computer programs have been created that search for SECIS elements within a genomesequence, based on the sequence and secondary structure characteristics of SECIS elements. These programs have been used in searches for novel selenoproteins. [cite journal | last = Lambert | first = A | coauthors = Lescure A, Gautheret D | year = 2002 | title = A survey of metazoan selenocysteine insertion sequences | journal = Biochimie | volume = 84 | pages = 953–959 | pmid = 12458087 | doi = 10.1016/S0300-9084(02)01441-4]
The SECIS element is found in a wide variety of eukaryotes, prokaryotes and viruses.cite journal | author = Mix H, Lobanov AV, Gladyshev VN | title = SECIS elements in the coding regions of selenoprotein transcripts are functional in higher eukaryotes | journal = Nucleic Acids Res. | volume = 35 | issue = 2 | pages = 414–23 | year = 2007 | pmid = 17169995 | doi = 10.1093/nar/gkl1060 | issn = ] cite journal | author = Cassago A, Rodrigues EM, Prieto EL, "et al" | title = Identification of Leishmania selenoproteins and SECIS element | journal = Mol. Biochem. Parasitol. | volume = 149 | issue = 2 | pages = 128–34 | year = 2006 | pmid = 16766053 | doi = 10.1016/j.molbiopara.2006.05.002 | issn = ] cite journal | author = Mourier T, Pain A, Barrell B, Griffiths-Jones S | title = A selenocysteine tRNA and SECIS element in Plasmodium falciparum | journal = RNA | volume = 11 | issue = 2 | pages = 119–22 | year = 2005 | pmid = 15659354 | doi = 10.1261/rna.7185605 | issn = ] cite journal | author = Lambert A, Lescure A, Gautheret D | title = A survey of metazoan selenocysteine insertion sequences | journal = Biochimie | volume = 84 | issue = 9 | pages = 953–9 | year = 2002 | pmid = 12458087| doi = 10.1016/S0300-9084(02)01441-4| issn = ]
* [http://mrna.otago.ac.nz/cgi-bin/tt_data_browse/RNAMotif?PatID=T0103 Transterm page for SECIS Element]
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