The shape of the nucleic acid molecule translated: linear
The quality of the mRNA/+RNA sequence: only_IRES_fragment
The abbreviated name of the virus/gene coding for this mRNA/+RNA molecule: PDGF2/c-sis
The genetic origin of this natural mRNA/+RNA: nuclear
The GenBankId GI:# number of the most similar mRNA/+RNA sequence to this one. 189727
Synonyms of the gene name:
The mRNA/+RNA description:
Homo sapiens platelet-derived growth factor beta polypeptide, promoter with 5'-UTR and part of ORF. The
sequence does not match currently annotated PDGF sequences in GenBank (nonred) nor EST/RefSeq databases and
probably should not be called PDGF2/cSIS at all.
The mRNA/+RNA sequence represented in the +DNA notation:
Credibility of mRNA sequence: reverse_engineered_fragment_only
The organism containing this mRNA with IRES segment in its genome:
The description of the protein encoded in this ORF: fragment of platelet-derived growth factor beta isoform 1, preproprotein
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): 1023-1082
OPTIONAL: The function of the encoded protein
isoform 1, preproprotein is encoded by transcript variant 1;
Platelet-derived growth factor, beta polypeptide (oncogene SIS);
platelet-derived growth factor, B chain; PDGF, B chain; becaplermin;
v-sis platelet-derived growth factor beta polypeptide (simian sarcoma viral oncogene homolog);
HUMANES PDGF-B GEN AUS PGEM2-PDGF-B, FLANKIERT VON 5'-ECORI UND 3'-HINDIII RESTRIKTIONSSCHNITTSTELLEN;
platelet-derived growth factor 2;
go_component: membrane [goid 0016020] [evidence IEA];
go_component: extracellular region [goid 0005576] [evidence NAS] [pmid 1661670];
go_function: growth factor activity [goid 0008083] [evidence IEA];
go_function: platelet-derived growth factor receptor binding [goid 0005161] [evidence NAS] [pmid 1661670];
go_process: cell proliferation [goid 0008283] [evidence IEA];
go_process: response to wounding [goid 0009611] [evidence NAS] [pmid 1661670];
go_process: regulation of progression through cell cycle [goid 0000074] [evidence IEA]
Bernstein et al., 1997 have used GI:189727 (alias M19719.1, 1482 b, 10-JAN-1995) record which contains
chromosomal DNA region. The size of UTRs does not match the description in the article. In contrast, the
GI:4505680 (3373 b, 27-NOV-2005) record matches the description of both UTR lengths (5'-UTR 1022b and 3'-UTR
1625b) quite well. This sequence aligns with the GI:189727 (alias M19719.1, 1482 b, 10-JAN-1995) with only 3
mismatches. Sella et al., 1999 refer to M19719.1 record and pinpoint discrepancies of their gene to it.
Therefore it seems in the original work from 1997 they used essentially the same cDNA fragment. Unfortunately,
they did not submit the sequence into GenBank. We have modified the M19719.1 sequence hopefully in the way as
described in Sella et al., 1999 as used throughout this IRESite record: "Referring to the RNA start site as nt
1 (which corresponds to nt 398 of human c-sis, accession no. M19719), the updated sequence includes the
following seven changes: nt 706 and 707 are GG (not CC), nt 921 is C (not U), nt 756 (G) and nt 786 (C) are
absent, and immediately following nt 863 and nt 868 there is an insertion of C. The nucleotide numbering
throughout the present study includes the above corrections." Surprisingly, the sequence we came up with
differs slightly (few isolated insertions/deletions) from the sequence in IRESdb database which received
the updated sequence directly from O. Elroy-Stein.
Bernstein et al., 1997 verified integrity of the bicistronic transcripts after in vivo transcription using
Northern blot analysis.
Han et al., 2003 refers to 2.8kb PDGF-B mRNA (GI:20987438) being produced from an internal promoter located
within the 5'-UTR region of the 3.8 kb mRNA studied by Bernstein et al., 1997 and Sella et al., 1999. The
promoter had activity of about 15/48 activity of control SV40 promoter with enhancer and contributed all
reported IRES-like activity from the second cistron.
GenBankId of the rRNA that interacts with this mRNA/+RNA: 36162
The name of the rRNA interacting with this mRNA/+RNA: 18S
The base range located on rRNA where this interaction occurs in 3'-5' direction. 1838-1826
The number of bases within that range which actually do interact. 9
The experimental validation of this interaction between mRNA and rRNA in these regions is available: no
The base range located on mRNA where this interaction occurs in 5'-3' direction. 1010-1022
The publication refers to bases 1010-1022 [5'-GCCcggaGUCGGC-3'] of the PDGF2/c-sis mRNA interacting with
the 3'-end of the 18S rRNA [5'-GUCGuaACaaGGU-3'] (9 bases in uppercase letters are basepaired).
There are many other complementary regions, mainly in the GC-rich regions. To name just a few at least close
to the 3'-end mentioned in the paper (base ranges in format mRNA:rRNA):
1015-1019:1249-1245, 5 bases
1012-1016:1740-1736, 5 bases
1012-1016:1752-1748, 5 bases
The IRES absolute position (the range includes START and STOP codons or their equivalents): 1-1022
How IRES boundaries were determined: experimentally_determined
The sequence of IRES region aligned to its secondary structure (if available):
Bernstein et al., 1997 stated in the article: "The D-IRES activity was conferred by the full-length (1022 nt)
5'-UTR or by a 395 nt segment spanning nucleotides 475–870 of the 5'-UTR. In contrast, the 273-nt
segment spanning nucleotides 215–488 of the 5'-UTR did not confer D-IRES activity and thereby served as
a negative control in our experiments (Fig. 3)."
The integrity of the bicistronic transcripts obtained in vivo in recombinant vaccinia virus infected cells
was verified by Northern blot.
Han et al. (2003) state that the cryptic promoter contributed all reported IRES-like activity from second
In vitro UV-crosslinking assay has shown p43 protein. Subsequent antibody assay confirmed the p43 protein has
hnRNP C epitope, seems to be hnRNP C1 and except its nuclear localization p43 also exists in cytoplasm of
differentiated cells (human chronic myelogenous leukemia cell line K562). In addition, antibody assay also
revealed p44 protein (nuclear only) which seems to be hnRNP C2.
The interaction region might be a U-rich region in the range 500-680.