{"title":"重金属暴露的双壳类软体动物中5-氨基乙酰丙酸(ALA)的增加:由于抑制卟胆色素原合成酶的影响?","authors":"V. Brock , A. Brock","doi":"10.1016/0742-8413(93)90091-X","DOIUrl":null,"url":null,"abstract":"<div><p>1. The effect of cadmium, lead, and mercury on 5-aminolevulinic acid (ALA), porphobilinogen (PBG), and PBG synthase was determined in hepatopancreas of the bivalve, <em>Cerastoderma edule</em> (L.).</p><p>2. Cd and Hg exposure induced increased ALA content, and thus an initial doubling of ALA within 24 hr.</p><p>3. Using ALA in excess (8 mmoll<sup>−1</sup>) as substrate, no PBG synthase (ALA dehydratase, EC 4.2.1.24) activity was detectable in freshly prepared hepatopancreas homogenates.</p><p>4. Increased ALA in metal exposed bivalves is not a simple effect due to metal inhibition of PBG synthase.</p><p>5. The observed lack of PBG synthase suggests an alternative to the general pathway where two ALA molecules condense to one PBG.</p></div>","PeriodicalId":72650,"journal":{"name":"Comparative biochemistry and physiology. C: Comparative pharmacology","volume":"105 3","pages":"Pages 493-499"},"PeriodicalIF":0.0000,"publicationDate":"1993-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0742-8413(93)90091-X","citationCount":"3","resultStr":"{\"title\":\"Increased 5-aminolevulinic acid (ALA) in heavy metal exposed bivalve molluscs, Cerastoderma edule: An effect due to inhibition of porphobilinogen synthase?\",\"authors\":\"V. Brock , A. Brock\",\"doi\":\"10.1016/0742-8413(93)90091-X\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>1. The effect of cadmium, lead, and mercury on 5-aminolevulinic acid (ALA), porphobilinogen (PBG), and PBG synthase was determined in hepatopancreas of the bivalve, <em>Cerastoderma edule</em> (L.).</p><p>2. Cd and Hg exposure induced increased ALA content, and thus an initial doubling of ALA within 24 hr.</p><p>3. Using ALA in excess (8 mmoll<sup>−1</sup>) as substrate, no PBG synthase (ALA dehydratase, EC 4.2.1.24) activity was detectable in freshly prepared hepatopancreas homogenates.</p><p>4. Increased ALA in metal exposed bivalves is not a simple effect due to metal inhibition of PBG synthase.</p><p>5. The observed lack of PBG synthase suggests an alternative to the general pathway where two ALA molecules condense to one PBG.</p></div>\",\"PeriodicalId\":72650,\"journal\":{\"name\":\"Comparative biochemistry and physiology. C: Comparative pharmacology\",\"volume\":\"105 3\",\"pages\":\"Pages 493-499\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1993-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0742-8413(93)90091-X\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Comparative biochemistry and physiology. C: Comparative pharmacology\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/074284139390091X\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Comparative biochemistry and physiology. C: Comparative pharmacology","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/074284139390091X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Increased 5-aminolevulinic acid (ALA) in heavy metal exposed bivalve molluscs, Cerastoderma edule: An effect due to inhibition of porphobilinogen synthase?
1. The effect of cadmium, lead, and mercury on 5-aminolevulinic acid (ALA), porphobilinogen (PBG), and PBG synthase was determined in hepatopancreas of the bivalve, Cerastoderma edule (L.).
2. Cd and Hg exposure induced increased ALA content, and thus an initial doubling of ALA within 24 hr.
3. Using ALA in excess (8 mmoll−1) as substrate, no PBG synthase (ALA dehydratase, EC 4.2.1.24) activity was detectable in freshly prepared hepatopancreas homogenates.
4. Increased ALA in metal exposed bivalves is not a simple effect due to metal inhibition of PBG synthase.
5. The observed lack of PBG synthase suggests an alternative to the general pathway where two ALA molecules condense to one PBG.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
