Page 35 - 《水产学报》2025年第6期
P. 35

雷丽娜,等                                                                 水产学报, 2025, 49(6): 069403

                                          singal peptide            β-1 domain

                       中国花鲈 L. maculatus                                                             103
                      黄金鲈 Perca flavescens                                                           103
                    白梭吻鲈 Sander lucioperc                                                            103
                                 M. miiuy                                                            103
                       欧洲舌齿鲈 D. labrax                                                               104
                      斜带石斑鱼 E. coioides                                                              103
                  大菱鲆 Scophthalmus maximus                                                           103
                       大西洋鲑 Salmo salar                                                              104
                   卵形鲳鲹 Trachinotus ovatus                                                           102
                            虹鳟 O. mykiss                                                             106
                                                        β-2 domain                              CP
                       中国花鲈 L. maculatus                                                             209
                      黄金鲈 Perca flavescens                                                           209
                    白梭吻鲈 Sander lucioperc                                                            209
                                 M. miiuy                                                            209
                       欧洲舌齿鲈 D. labrax                                                               210
                      斜带石斑鱼 E. coioides                                                              209
                  大菱鲆 Scophthalmus maximus                                                           209
                       大西洋鲑 Salmo salar                                                              210
                   卵形鲳鲹 Trachinotus ovatus                                                           208
                            虹鳟 O. mykiss                                                             212
                                                                                 TXR      SXR
                                              TM        CYT
                       中国花鲈 L. maculatus                        249
                      黄金鲈 Perca flavescens                      249
                    白梭吻鲈 Sander lucioperc                       249
                                 M. miiuy                       249
                       欧洲舌齿鲈 D. labrax                          250
                      斜带石斑鱼 E. coioides                         249
                  大菱鲆 Scophthalmus maximus                      249
                       大西洋鲑 Salmo salar                         245
                   卵形鲳鲹 Trachinotus ovatus                      248
                            虹鳟 O. mykiss                        247
                                                                    (c)
                            图 2    中国花鲈  IgMH  可变区 (a)、恒定区 (b) 和   MHCⅡ β  与其他鱼类多序列比对
              (a) Leader 为预测前导链、FR1~4  为  4  个骨架区、CDR1~3  为  3  个互补决定区,不同区域由“↓”分开,保守位点的半胱氨酸     (C) 用红色方框
              标出,FR3  中保守的   DX3YYC  基序和  FR4  中保守  FDYWGKGT-VTV-S  基序用蓝色方框标出。(b) CH1~4  为  4  个恒定区,由“↓”分开;保守
              的色氨酸 (W) 和半胱氨酸 (C) 用红色方框标出,形成链内二硫键的          2  个半胱氨酸用黑线连在一起;不同鱼类共有的色氨酸位点用“☆”标示,
              键间二硫键用“L”标示。(c) signal peptide 为信号肽、β-1/β-2 domain  为  β-1/β-2  结构域、CP  为连接肽、TM  为跨膜区、CYT  为胞内区,为序
              列上方显示了预测的信号肽、β-1       结构域、β-2  结构域、连接肽、跨膜区和胞内区,不同区域由“↓”分开;预测的蛋白激酶                C  磷酸化位点用
              蓝色方框标出,TXR     和  SXR  为鱼类中保守的蛋白激酶   C  磷酸化位点;保守位点的半胱氨酸 (C) 用红色方框标出,N-乙酰化位点用横线标
              出。物种名称及序列号:(a) (b) 中国花鲈       QWX94362.1,斜带石斑鱼   AAX78206.1,鳜 AAQ14862.1,大口黑鲈 QLF98876.1,大黄鱼
              ACM24795.1,红笛鲷 ADX01345.1,尼罗罗非鱼  AAL99934.1,欧洲舌齿鲈 ARC77253.1,军曹鱼  AFN02400.1,黄尾鰤 AUT13231.1。(c) 中
              国 花 鲈  AXY87851.1, 黄 金 鲈  XP_028420408.1, 白 吻 梭 鲈  XP_031172151.1, 鮸  AGJ70356.1, 欧 洲 舌 齿 鲈  CAJ34344.1, 斜 带 石 斑 鱼
              ADZ99156.1,大菱鲆 AWO97408.1,大西洋鲑 CAA49726.1,卵形鲳鲹  APD68825.1,虹鳟 CBX11172.1。
                          Fig. 2 Multiple sequence alignment of IgMH variable region (a), constant region (b) and
                                        MHCⅡ β between L. maculatus and other fish species
              (a) Leader: predicted leader, FR1-4: four framework regions, CDR1-3: three complementarity determining regions; different regions are separated by "↓";
              conserved cysteine (C) sites are marked with red boxes, and the conserved DX3YYC motif in FR3 and FDYWGKGT-VTV-S motif in FR4 are indicated
              with blue boxes. (b) CH1-4 denote four constant regions, separated by "↓"; cysteine (C) and tryptophan (W) at conserved sites are marked with red boxes,
              and the two cysteines that form a disulfide bond in the chain are connected together with a black line; conserved tryptophan sites shared by different fish
              species are marked with “☆”, and the inter-bond disulfide bond is marked with "L". (c) regions corresponding to the putative signal peptide, β-1domain,
              β-2domain, connecting peptide (CP), transmembrane region (TM) and cytoplasmic tail (CYT) are shown above the sequences, and separated by "↓"; pre-
              dicted protein kinase C phosphorylation sites are marked with blue boxes, and TXR and SXR represent conserved protein kinase C phosphorylation sites
              in fish; conserved cysteine (C) sites are marked with red boxes, and the N-acetylation site is marked with a horizontal line. Species and GenBank acces-
              sion  numbers:  (a)  (b)  L.  maculatus  QWX94362.1,  E.  coioides  AAX78206.1,  S.  chuatsi  AAQ14862.1,  M.  salmoides  QLF98876.1,  L.  crocea
              ACM24795.1,  Lutjanus  sanguineus  ADX01345.1,  O.  niloticus  AAL99934.1,  D.  labrax  ARC77253.1,  Rachycentron  canadum  AFN02400.1,  Seriola
              lalandi AUT13231.1. (c) L. maculatus AXY87851.1, Perca flavescens XP_028420408.1, Sander lucioperc XP_031172151.1, M. miiuy AGJ70356.1, D.
              labrax CAJ34344.1, E. coioides ADZ99156.1, Scophthalmus maximus AWO97408.1, Salmo salar CAA49726.1, Trachinotus ovatus APD68825.1, O.
              mykiss CBX11172.1.

              达的   IgMH  蛋白单体和      IgMHC  1- 2  蛋白多聚体反        草鱼的全血清没有交叉反应              (图  11)。

              应,也能与中国花鲈全血清中相对分子质量在
                                                               3    讨论
              55~95 ku  的蛋白条带发生强烈反应,与同属鮨
              科的鳜的全血清发生弱反应,但与大口黑鲈和                                 当鱼体受病原侵袭时,其适应性                  (获得性)

              中国水产学会主办  sponsored by China Society of Fisheries                          https://www.china-fishery.cn
                                                            9
   30   31   32   33   34   35   36   37   38   39   40