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データを開く
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基本情報
登録情報 | データベース: SASBDB / ID: SASDBX4 |
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![]() | Albumen gland precursor of perivitellin-2 (PcPV2)
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機能・相同性 | ![]() nutrient reservoir activity / toxin activity / carbohydrate binding / extracellular region / membrane 類似検索 - 分子機能 |
生物種 | ![]() |
![]() | ![]() タイトル: Apple Snail Perivitellin Precursor Properties Help Explain Predators' Feeding Behavior. 著者: María Pilar Cadierno / Marcos Sebastián Dreon / Horacio Heras / ![]() 要旨: In contrast with vitellogenin maturation, it is unknown whether gastropod perivitellin precursors are subject to large structural changes. The gastropod reproductive tract includes an accessory ...In contrast with vitellogenin maturation, it is unknown whether gastropod perivitellin precursors are subject to large structural changes. The gastropod reproductive tract includes an accessory organ, the albumen gland (AG), that produces and secretes perivitelline fluid. In the apple snail Pomacea canaliculata, the large, reddish-pink AG provides eggs with perivitellins that are defensive against predators. Although the AG makes a considerable contribution to apple snail biomass, field observations indicate that it is rejected by avian and mammalian predators, although the underlying reason remains unknown. By analyzing the structure-function properties of P. canaliculata perivitellin precursors, we provide insight into perivitellin maturation and its relationship with apple snail predator feeding behavior. Structural analysis using small-angle X-ray scattering, absorption and fluorescence spectroscopy, circular dichroism, electrophoresis, chromatography, and partial proteolysis showed that the size, shape, and structure of perivitellin precursors resemble those of egg mature forms. Functional analysis indicates that the precursors of the defensive perivitellins ovorubin (PcOvo) and perivitellin-2 (PcPV2) are highly stable and antinutritive, withstanding proteinase digestion and displaying structural stability of their quaternary structure under a wide pH range (4.0-10.0). Furthermore, AG extracts limit a predator's ability to digest nutrients and are toxic to mice (median lethal concentration 96 h after administration: 5.9 mg/kg). Treated mice displayed neurologic signs similar to those produced by egg PcPV2. Results indicate that apple snails store active precursors of egg proteins inside the AG, providing evidence that gastropod perivitellin precursors do not experience the large structural processing of invertebrate vitellogenin maturation. These defensive proteins provide the apple snail AG with neurotoxic, antinutritive, and antidigestive activity, a likely explanation for the predators' feeding behavior. |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
-モデル
モデル #539 | ![]() タイプ: dummy / ソフトウェア: (r3695) / ダミー原子の半径: 3.60 A / カイ2乗値: 3.0976 ![]() |
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モデル #540 | ![]() タイプ: dummy / ソフトウェア: (r3695) / ダミー原子の半径: 3.60 A / カイ2乗値: 3.010225 ![]() |
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試料
![]() | 名称: Albumen gland precursor of perivitellin-2 (PcPV2) / 試料濃度: 0.60-2.40 / Entity id: 346 / 347 |
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バッファ | 名称: 20 mM Tris-HCl / 濃度: 20.00 mM / pH: 8.5 |
要素 #346 | 名称: PcPV2-31 / タイプ: protein / 記述: Perivitellin-2 31 kDa subunit / 分子量: 31.584 / 分子数: 4 / 由来: Pomacea canaliculata / 参照: UniProt: P0C8G7 配列: MVKKIHFIME RHASIVAFLL AVLALTESQA FTSVKLPRDE HWPYNYVSIG PAGVWAVNRQ NKLFYRTGTY GDNANMGSGW QFKQDGVGQV DVGKDKVGYI NLSGGSLFRI DGISQGNPVG GSPKSWEWWT KYIGMSLRED TRFSSRIENQ NKVLTFTFRT CFWASRITNW ...配列: MVKKIHFIME RHASIVAFLL AVLALTESQA FTSVKLPRDE HWPYNYVSIG PAGVWAVNRQ NKLFYRTGTY GDNANMGSGW QFKQDGVGQV DVGKDKVGYI NLSGGSLFRI DGISQGNPVG GSPKSWEWWT KYIGMSLRED TRFSSRIENQ NKVLTFTFRT CFWASRITNW CFADSSYTET VTAGGSGTWI TKSQLKYKSG TFGNPDTEGG DWITVDSGSF QHVSSGSGVV LAVRSNGELV KRTGITCSLP QGSGWTSMLN GMSRVDTYGT VAWAVDTYGD LYFINL |
要素 #347 | 名称: PcPV2-67 / タイプ: protein / 記述: Perivitellin-2 67 kDa subunit / 分子量: 62.517 / 分子数: 4 / 由来: Pomacea canaliculata / 参照: UniProt: P0C8G6 配列: MSQLRWWVVS QLLLLIVVCI LDHSEGARVC PKIVPGLDKL RVGVDITKLD LLPLFDLGDN GFRSAVADYT CDRGQTTVVD GESFDVPDQV DSVVIESSGQ QTSSVTTIKS ESQISQALSI SAGISVDTAK AGFSSSASYA EMQEAITKYG RTVSQMSAVY TTCSANLSPN ...配列: MSQLRWWVVS QLLLLIVVCI LDHSEGARVC PKIVPGLDKL RVGVDITKLD LLPLFDLGDN GFRSAVADYT CDRGQTTVVD GESFDVPDQV DSVVIESSGQ QTSSVTTIKS ESQISQALSI SAGISVDTAK AGFSSSASYA EMQEAITKYG RTVSQMSAVY TTCSANLSPN LLLGQNPLQT LSRLPSDFTA DTEGYYDFIK TYGTHYFNKG KLGGMFLFTS ETDMSYFQNK NSQQVEANIK ATFASILSTE TGGSSDQSKE VIEFKESSLI TAKFFGGRTN LAADGLTKWQ PTIAKLPYFM SGTLSTISSL IADTTKRASM ELAVKNYLLK AKVANLDRLT YIRLNSWTVG HNELRDLSAQ LQNLKKKTIF SDEDEKLLQS IEDQVSVPAW FSDRTTFCFR STAVGSADQC NGQSTSTLCA EPNRYTQQYM DKTYLGDTGC RLVWKLSTTE SSDWFKSVKV NFRWYPTWSP CACGPVGTPF TISAPANSWT QDYLDVTNPK FGECMLQWMI EVPPTATLWA KNLEFCIDFT CGKKKQCVDA NHWTEPYLDI SAHEACGMSW ALIAK |
-実験情報
ビーム | 設備名称: Brazilian Synchrotron Light Laboratory SAXS2 Beamline 地域: Campinas / 国: Brazil ![]() | |||||||||||||||||||||||||||||||||
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検出器 | 名称: MAR 165 CCD | |||||||||||||||||||||||||||||||||
スキャン | 測定日: 2014年6月10日 / 保管温度: 25 °C / セル温度: 25 °C / 照射時間: 300 sec. / フレーム数: 5 / 単位: 1/nm /
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距離分布関数 P(R) |
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結果 |
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