The description of the protein encoded in this ORF: Nonstructural protein precursor. Computer analysis revealed that the aminoacid sequence of ORF1 contains core
motifs of picornaviral 2C RNA helicase, 3C cysteine protease and 3D RNA dependent RNA polymerase.
The translational frameshift (ribosome slippage) involved: 0
The ribosome read-through involved: no
The alternative forms of this protein occur by the alternative initiation of translation: no
The ORF absolute position (the base range includes START and STOP codons or their equivalents): 571-6006
The description of the protein encoded in this ORF: The capsid protein precursor contains coding regions of four capsid proteins: 33, 30, 26, 4.5 kDa. Coding
regions of these proteins were mapped by determination of their N-terminal sequences.
The translational frameshift (ribosome slippage) involved: 0
The ribosome read-through involved: no
The alternative forms of this protein occur by the alternative initiation of translation: yes
The ORF absolute position (the base range includes START and STOP codons or their equivalents): 6193-8628
Remarks:
IRES is a part of the intergenic region of the genome and extends slightly into ORF2 which starts with CAA
codon (Gln). The sequence directly submitted by authors is GI:2344756.
The IRES absolute position (the range includes START and STOP codons or their equivalents): 6002-6146
Conclusion: putative_IRES
How IRES boundaries were determined: experimentally_determined
The sequence of IRES region aligned to its secondary structure (if available):
Remarks:
Several studies showed secondary and also 3D structure of the IRES (see the references below). Refer also to
PDB:2IL9 entry. Notably, alignment of the sequence deposited in IRESite reveals that we probably picked up
not the best matching genomic sequence:
>IRESite_Id:59 PSIV_IGR virus
Length = 8797
Score = 200 bits (114), Expect = 2e-52
Identities = 136/150 (90%), Gaps = 13/150 (8%)
Strand = Plus / Plus
2IL9: 1 gctgactatgtgatcttattaaaattaggttaaatttcgaggttaaaaatagttttaata 60
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Sbjct: 6002 gctgactatgtgatcttattaaaattaggttaaatttcgaggttaaaaatagttttaata 6061
2IL9: 61 ttgctatagtcttagaggtcttgcga-a-----agcttaccacacaagatggaccggagc 114
||||||||||||||||||||||| | | | |||||||||||||||||||||||||
Sbjct: 6062 ttgctatagtcttagaggtcttg-tatatttata-cttaccacacaagatggaccggagc 6119
2IL9: 115 gaaag--ctccaatatctagtgtaccctcg 142
|| |||||||||||||||||||||||
Sbjct: 6120 ---agccctccaatatctagtgtaccctcg 6146
The absolute position of the experimentally mapped region (the range includes START and STOP codons or their equivalents): 6005-6192
The underlying nucleic acid sequence and structure of the mapped region:
Rendering structure of PSIV mRNA 188 nt long with energy of -27.30 kcal/mol as calculated by RNAeval using VARNA Java applet with some IRESite improvements (see VARNA modified by IRESite). Hold left mouse button to move structure parts, hold right mouse button to move whole structure, use mouse wheel to zoom. Right mouse-click opens a menu to export into JPG/SVG and many other options.
Remarks:
IRES structure was mapped by mutagenesis studies which were verified by RNA structure probing using DMS, CMCT
(1-cyclohexyl-3-(2-morpholinoethyl)carbodiimide metho-p-toluene sulfonate) or by hydroxyl radical
modification. The last method was performed at 0oC.
There are three pseudoknots in this IRES element:
1. PK I is formed by base pairing between nts 6163-6167 and 6188-6192
2. PK II is formed by base pairing between nts 6039-6043 and 6142-6146
3. PK III is formed by base pairing between nts 6078-6082 and 6110-6114
4.1.1. Chemicals used to characterize at least partially the 2D structure.
Chemical reagent used with its respective buffer:
ss_experiment_with_chemical_id: 11
The temperature (in degrees of Celsia): 20
The chemical reagent used to determine the 2D structure: DMS
Chemical reagent used with its respective buffer:
Version: 0
pH 7.20
Li+ [mM] 0
Na+ [mM] 0
K+ [mM] 150.00
Mg2+ [mM] 2.00
Ca2+ [mM] 0
Cl- [mM] 100.00
Tris [mM] 0
BSA [mM] 0
HEPES [mM] 0
EGTA [mM] 0
EDTA [mM] 0
cacodylate [mM] 50.00
Other buffer components and their relative concentrations:
40 mM DMS
Chemical reagent used with its respective buffer:
ss_experiment_with_chemical_id: 12
The temperature (in degrees of Celsia): 20
The chemical reagent used to determine the 2D structure: CMCT
Chemical reagent used with its respective buffer:
Version: 0
pH 7.40
Li+ [mM] 0
Na+ [mM] 0
K+ [mM] 100.00
Mg2+ [mM] 2.00
Ca2+ [mM] 0
Cl- [mM] 100.00
Tris [mM] 0
BSA [mM] 0
HEPES [mM] 0
EGTA [mM] 0
EDTA [mM] 0
cacodylate [mM] 0
Other buffer components and their relative concentrations:
The absolute position of the experimentally mapped region (the range includes START and STOP codons or their equivalents): 225-615
The underlying nucleic acid sequence and structure of the mapped region:
Rendering structure of PSIV mRNA 391 nt long with energy of -61.00 kcal/mol as calculated by RNAeval using VARNA Java applet with some IRESite improvements (see VARNA modified by IRESite). Hold left mouse button to move structure parts, hold right mouse button to move whole structure, use mouse wheel to zoom. Right mouse-click opens a menu to export into JPG/SVG and many other options.