A promoter reported in cDNA corresponding to IRES sequence: unclear
The total number of notable open-reading frames (ORFs): 1
Summary of possible issues when IRES cDNA is experimentally transcribed in vivo:
Summary of experiments studying integrity of the in vivo transcripts in a particular host:
Integrity (uniformity) of mRNA tested using Northern-blot: not_tested
Integrity (uniformity) of mRNA tested using RNase protection: not_tested
Integrity (uniformity) of mRNA tested using 5'-RACE: not_tested
Integrity (uniformity) of mRNA tested using primer extension : not_tested
Integrity (uniformity) of mRNA tested using RT-PCR: not_tested
Integrity (uniformity) of mRNA tested using real-time quantitative polymerase chain reaction (rtqPCR): not_tested
Integrity (uniformity) of mRNA tested using RNAi: heterogeneous_population_of_molecules_found
Integrity (uniformity) of mRNA tested using S1 nuclease mapping: not_tested
Cryptic promoter presence was confirmed by expression from a promoter-less plasmid: not_tested
Cryptic promoter presence was confirmed in an experimental setup involving inducible promoter: not_tested
Integrity (uniformity) of mRNA molecules or possible promoter presence expressed in vivo was tested using another method, please specify in Remarks: not_tested
The description of the protein encoded in this ORF: apoptotic protease activating factor 1
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): 737-4354
Remarks:
The best really existing mRNA sequence in Genbank is AK307509 (GI:164692476) which has longer 5'-UTR by 159bp
(obtained by oligo-capping approach) compared to entry AF013263 (GI:2330014). The below mentioned 7kb long
sequence is a chimera of Apaf1 mRNA with another gene since position 5244:
>emb|CR603841.1| UniGene info full-length cDNA clone CS0DI077YE15 of Placenta Cot 25-normalized of Homo
sapiens Length=1596
AF013263 5244 GGTCTTGAACTCTTGGCCTCAAGTAATCCTCCTGCCTCAGCCTCCCAAAGTGTTGGGATT 5303
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Sbjct 1 GGTCTTGAACTCTTGGCCTCAAGTAATCCTCCTGCCTCAGCCTCCCAAAGTGTTGGGATT 60
[cut]
AF013263 6384 TCCTTAGAATACCCAAATCATAATTTTATTTGTACACACTGTTAGGGGCTCATCTCATGT 6443
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Sbjct 1141 TCCTTAGAATACCCAAATCATAATTTTATTTGTACACACTGTTAGGGGCTCATCTCATG- 1199
AF013263 6444 AGG 6446
|||
Sbjct 1200 AGG 1202
[cut]
AF013263 6617 GAGGATTCCTTGAGCCCTGGAGTTTGAGTCCAGCCTGGGTGACATAGCAAGACCCTGTCT 6676
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Sbjct 1199 GAGGATTCCTTGAGCCCTGGAGTTTGAGTCCAGCCTGGGTGACATAGCAAGACCCTGTCT 1258
[cut]
AF013263 6977 gaatttaaaaaatttttgtaaaaataaaattcacaaaa 7014
||||||||||||||||||||||||||||||||||||||
Sbjct 1559 GAATTTAAAAAATTTTTGTAAAAATAAAATTCACAAAA 1596
The Apaf1-mRNA region in this chimeric message of AF013263 ends at the position 4283:
>gb|EF560718.1| UniGene infoGene info Homo sapiens clone DKFZp781B1145 APAF1 protein (APAF1) mRNA, complete
cds Length=3744
AF013263 573 GGAAGATGGATGCAAAAGCTCGAAATTGTTTGCTTCAACATAGAGAAGCTCTGGAAAAGG 632
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Sbjct 1 GGAAGATGGATGCAAAAGCTCGAAATTGTTTGCTTCAACATAGAGAAGCTCTGGAAAAGG 60
[cut]
AF013263 4231 TGATATCAACTTTTTATAAAGCTCTTAATTGTTGTGCAGTATTGCATTCATTA 4283
|||||||||||||||||||||||||||||||||||||||||||||||||||||
Sbjct 3692 TGATATCAACTTTTTATAAAGCTCTTAATTGTTGTGCAGTATTGCATTCATTA 3744
Interestingly, several mRNAS incomplete at the 3'-end terminate just at position 4162 which is a STOP codon:
>emb|AJ243004.1| UniGene infoGene info Homo sapiens mRNA for apoptotic protease activating factor 1
Length=3618
[cut]
AF013263 4111 TGTGACTGTGGATAATCTTGGTATTTTATATATTTTACAGACTTTAGAATAA 4162
||||||||||||||||||||||||||||||||||||||||||||||||||||
Sbjct 3567 TGTGACTGTGGATAATCTTGGTATTTTATATATTTTACAGACTTTAGAATAA 3618
In conclusion, we have used sequence in AK307509 for the 5'-UTR and most of the CDS and the record EF560718
to get up to the 3'-end.
Several alternatively spliced messages exist but the splice junctions are in the CDS, thus not important to
the IRES story.
Integrity of the transcripts was verified by Northern blot using randomly primed cDNA probes against Fluc.
Shorter transcript fragment of 1.3kb was detected (also found in pRmycF transcripts containing c-myc). No more
sensitive testing of integrity of transcripts produced was done, e.g. RT-PCR of the in vivo produced
transcription products or direct mRNA transfection or tests based on a promoter-less plasmid. [Coldwell et
al., 2000]
It appears the very two 3'-most bases of the 5'-UTR of Apaf-1 were not cloned into the pRAF plasmid vector
because they had to be replaced by 'cc' bases of the cloning NcoI site 'ccATGg'. Please refer to the
annotation of pRAF plasmid (IRESiteID:341).
Cammas et al. (2007) confirmed either a splicing or cryptic promoter issue with the pRAF plasmid in DNA
transfections (Supplemental Figure S2) in RNAi based assay in which they were not able to inhibit the Apaf-1
IRES activity like of EMCV, HRV IRES. They repeated results of Sherril et al. (2004) showing that either a
splicing issue or a promoter is functional in HeLa cells when Bcl2 IRES is placed into the pRF vector.
Further, they show that in direct mRNA transfection Apaf-1 IRES activity is only 2x above the empty vector
control (capped, poly(A)-tailed messages) and thus conclude as not functional.
The IRES absolute position (the range includes START and STOP codons or their equivalents): 504-734
Conclusion: putative_IRES
How IRES boundaries were determined: experimentally_determined
The sequence of IRES region aligned to its secondary structure (if available):
There is no Vienna RNA package installed on the server or some error/warning messages were output. Due to that maybe we cannot prepare 2D structures for display. The error/warning message was:
)........((((((((.((((((...(((...((.(((((((...))..))))).)))))...)))).)))))...)))))..(((((..........((..(.(.(..((((.(((..(((((((...((.((...(((((((.....................)).)))))...)).))..))))).)).(((...........)))..))).)))))).).))))))
ERROR: unbalanced brackets in make_pair_table
STDOUT was:
Remarks:
The -233 to -1 (due to the cloning approach possibly only -233 to -3) fragment retains 75% activity (Fig. 6B)
of the full-length 5'-UTR (1-577b). Apaf-1 IRES is functional in HeLa, HepG2 cells, lower activity was seen in
MCF7, HK293, COS7, MRC5 cells. No activity seen in SY5Y and Balb/c cells.
The absolute position of the experimentally mapped region (the range includes START and STOP codons or their equivalents): 160-739
The underlying nucleic acid sequence and structure of the mapped region:
There is no Vienna RNA package installed on the server or some error/warning messages were output. Due to that maybe we cannot prepare 2D structures for display. The error/warning message was:
Rendering structure of Apaf-1 mRNA 580 nt long with energy of -194.30 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:
Structure from Fig. 4E.
4.1.1. Enzymes used to characterize at least partially the 2D structure.
Enzyme or a combination of enzymes used in a single experiment with respective buffer:
ss_experiment_with_enzyme_id: 48
The temperature (in degrees of Celsia): 22
The enzymatic method used to determine the 2D structure: ribonuclease V1
Enzyme or a combination of enzymes used in a single experiment with respective buffer:
Version: 0
pH 7.00
Li+ [mM] 0
Na+ [mM] 0
K+ [mM] 100.00
Mg2+ [mM] 10.00
Ca2+ [mM] 0
Cl- [mM] 120.00
Tris [mM] 10.00
BSA [mM] 0
HEPES [mM] 0
EGTA [mM] 0
EDTA [mM] 0
cacodylate [mM] 0
4.1.2. Chemicals used to characterize at least partially the 2D structure.
Chemical reagent used with its respective buffer:
ss_experiment_with_chemical_id: 20
The temperature (in degrees of Celsia): 0
The chemical reagent used to determine the 2D structure: DMS
Chemical reagent used with its respective buffer:
Version: 0
pH 7.00
Li+ [mM] 0
Na+ [mM] 0
K+ [mM] 100.00
Mg2+ [mM] 10.00
Ca2+ [mM] 0
Cl- [mM] 100.00
Tris [mM] 10.00
BSA [mM] 0
HEPES [mM] 0
EGTA [mM] 0
EDTA [mM] 0
cacodylate [mM] 0
Other buffer components and their relative concentrations:
20mM acetate (CH3COO)-
Chemical reagent used with its respective buffer:
ss_experiment_with_chemical_id: 21
The temperature (in degrees of Celsia): 0
The chemical reagent used to determine the 2D structure: kethoxal
Chemical reagent used with its respective buffer:
Version: 0
pH 7.00
Li+ [mM] 0
Na+ [mM] 0
K+ [mM] 100.00
Mg2+ [mM] 10.00
Ca2+ [mM] 0
Cl- [mM] 100.00
Tris [mM] 10.00
BSA [mM] 0
HEPES [mM] 0
EGTA [mM] 0
EDTA [mM] 0
cacodylate [mM] 0
Other buffer components and their relative concentrations: