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第44卷第10期 陈 露,张静静,时 坚,等. S100A4核定位在胰腺癌转移中的作用与机制研究[J].
2024年10月 南京医科大学学报(自然科学版),2024,44(10):1323-1336,1434 ·1331 ·
A B
IP: IgG S100A4 JASSA:
25 kDa— SUMO1⁃S100A4 Results for putatifs SUMO sites
Position Best Consensus direct Consensus inverted
IB 25 kDa— SUMO2/3⁃S100A4 K Sequence PS Type PSd DB Hit Type PSi DB Hit
10 kDa— S100A4 K7 ----MACPLEKALDVMVSTFH None None None None None
K18 ALDVMVSTFHKYSGKEGDKFK None None None None None
Input
K22 MVSTFHKYSGKEGDKFKLNKS None None None 1 None None 1
10 kDa— S100A4 K26 FHKYSGKEGDKFKLNKSELKE None None None None None
K28 KYSGKEGDKFKLNKSELKELL None None None None None 2
K31 GKEGDKFKLNKSELKELLTRE None None None None None
40 kDa— β⁃actin
K35 DKFKLNKSELKELLTRELPSF None None None 1 None None 1
K48 LTRELPSFLGKRTDEAAFQKL None None None None None
K57 GKRTDEAAFQKLMSNLDSNRD None None None None None
K96 CNEFFEGFPDKQPRKK----- None None None 1 None None 1
K100 FEGFPDKQPRKK--------- None None None None None
K101 EGFPDKQPRKK---------- None None None None None
SUMOplot:
001 MACPLEKALD VMVSTFHKYS GKEGDKFKLN KSELKELLTR ELPSFLGKRT Motifs with high probability
051 DEAAFQKLMS NLDSNRDNEV DFQEYCVFLS CIAMMCNEFF EGFPDKQPRK Motifs with low probability
101 K Overlapping Motifs
No. Pos. Group Score No. Pos. Group Score
1 K22 FHKYS GKEG DKFKL 0.5 2 K96 FEGFP DKQP RKK 0.39
C
Amino acid sequences
22 EF⁃hand 96
Homo sapiens LEKALDVMVSTFHKYSGKEGDKFKLNKSELKELL CIAMMCNEFFEGFPDKQPRKK
Mus musculus LEEALDVIVSTFHKYSGKEGDKFKLNKTELKELL CIAMMCNEFFEGCPDKQERKK
Bos taurus LEKALDVMVSTFHKYSGKEGDKFKLNKSELKELL CIAMMCNEFFEGFPDKQPRKK
Equus caballus LEKALDVMVSTFHKYSGKEGDKFKLNKSELKELL CIAMMCNEFFEGFPDKQPRKK
Sus scrofa LEKALDVMVSTFHKYSGKEGDKFKLNKSELKELL CIAMMCNEFFEGFPDKQPRKK
D E IP: IgG HA
IB 25 kDa— SUMO1⁃S100A4
Input
10 kDa— HA⁃S100A4
40 kDa— β⁃actin
Flag⁃SUMO1: - + + + +
Normal S100A4 Mutant S100A4 HA⁃S100A4: pcDNA3.1 K22R K96R DKR
WT
A:Detection of endogenous S100A4 SUMOylation. Immunoprecipitation was performed with IgG or anti⁃S100A4 antibody,followed by Western
blotting with anti⁃SUMO1 or anti⁃SUMO2/3 antibodies. B:Results predicted by JASSA and SUMOplot. Lysine residues 22 and 96 were identified as pos⁃
sible SUMO⁃modified binding sites. C:Sequence alignment of S100A4 homologues in different species,with potential SUMO modification sites(K22 ver⁃
sus K96)indicated in yellow. D:The 3D protein structure of wild type and double mutant DKR⁃S100A4 predicted by website. E:Changes in S100A4
SUMOylation in cells transfected with HA⁃S100A4 wild⁃type(WT),HA⁃S100A4⁃K22R,HA⁃S100A4⁃K96R,and HA⁃S100A4⁃DKR.
图4 S100A4的SUMO化修饰位点
Figure 4 SUMOylation sites of S100A4
在转录起始位点(transcription start site,TSS)上游, Peak 上具有特异性的短序列Motif 并分析这些Motif
说明 S100A4 在基因组上的结合位点富集于转录启 对应的转录因子的结合位点,发现 TWIST2(bHLH)
动区(图8A~C)。对S100A4⁃DKR和WT在基因组上 (14.62%,q=0.0274)、BMAL1(bHLH)(13.90%,q=
的结合差异基因位点进行GO和KEGG富集分析,结 0.0416)、c ⁃ Myc(bHLH)(10.21% ,q=0.0006)、p53
果表明,CUT&Tag 测序中的 S100A4 参与调控的基 (p53)(8.62%,q=0.0485)、AP⁃2γ(AP2)(7.80%,q=
因在与肿瘤转移相关的多种信号通路中富集(图 0.0419)、MNT(bHLH)(7.57%,q=0.0028)等转录因
8D、E),如划痕愈合、焦点黏附、肌动蛋白细胞骨架 子对应的 Motif 占总序列百分比较高(表 2)。这些
调节、Wnt 信号通路、细胞黏附分子(cell adhesion 转录因子与肿瘤转移的恶性生物学行为密切相
molecule,CAM)、细胞外基质受体相互作用等,提示 关,提示 S100A4 可能通过与这些转录因子相互作
S100A4 在人类胰腺癌进展中的关键作用。寻找 用,进而参与转移相关基因的转录调控,提高 PC