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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
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