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2017 ; 8
(47
): 82714-82727
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Probably less than one-tenth of the genes produce only the wild type protein
without at least one additional protein isoform in some human cancer cell lines
#MMPMID29137297
Yan R
; Zhang J
; Zellmer L
; Chen L
; Wu D
; Liu S
; Xu N
; Liao JD
Oncotarget
2017[Oct]; 8
(47
): 82714-82727
PMID29137297
show ga
To estimate how many genes produce multiple protein isoforms, we electrophoresed
proteins from MCF7 and MDA-MB231 (MB231) human breast cancer cells in SDS-PAGE
and excised narrow stripes of the gel at the 48kD, 55kD and 72kD. Proteins in
these stripes were identified using liquid chromatography and tandem mass
spectrometry. A total of 765, 750 and 679 proteins from MB231 cells, as well as
470, 390 and 490 proteins from MCF7 cells, were identified from the 48kD, 55kD
and 72kD stripes, respectively. We arbitrarily allowed a 10% technical variation
from the proteins' theoretical molecular mass (TMM) and considered those proteins
with their TMMs within the 43-53 kD, 49-61 kD and 65-79 kD ranges as the wild
type (WT) expected from the corresponding stripe, whereas those with a TMM above
or below this range as a smaller- or larger-group, respectively. Only 263
(34.4%), 269 (35.9%) and 151 (22.2%) proteins from MB231 cells and 117 (24.9%),
135 (34.6%) and 130 (26.5%) proteins from MCF7 cells from the 48kD, 55kD and 72kD
stripes, respectively, belonged to the WT, while the remaining majority belonged
to the smaller- or larger-groups. Only about 3-16%, on average about 10%
regardless of the stripe and cell line, of the proteins appeared in only one
stripe and within the WT range, while the remaining preponderance appeared also
in additional stripe(s) or had a larger or smaller TMM. We conclude that few
(fewer than 10%) of the human genes produce only the WT protein without
additional isoform(s).