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Regulation of Gene Expression

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Title: Last modified by: zhang Created Date: 11/30/1999 10:55:57 AM Document presentation format: – PowerPoint PPT presentation

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Title: Regulation of Gene Expression


1
? ? ? ?
??????
Regulation of Gene Expression
2
???? ??????
  • ?????,????????2-15??????????????
  • ????????????????????????????????,?????????????????
    ???
  • ????
    ?????????????

3
???? ??????
  • ??
    ???????(??????????)???????(??????????
    )
  • ?????????????
  • ???????????????

4
????????????????
  • ???
    ???????????,?????
    mRNA,??????????????,?????? ?
  • ????????
  • ???????????

5
????????????????
  • ??????(enzyme induction)
  • ?????(operon)??????
  • ???????(Lac operon)??? ????(Trp operon)
  • ?? cAMP??????
  • ???????????????

6
??????
?????????????? ????
inducer removed
??????
inducer added
??????
7
??????
?
???
?????
??
??
??????
8
??????
  • ?????????????????????????????
  • ???????????????
  • 1961?,Jacob and Monod?????????
  • ?????????????????????????

9
???????????
  • ???
  • ????? ????? ???? ??????
  • R ( i ) P
    O S
  • inhibitor promotor operator
    structural gene

    gene

10
???????????
  • ??????RNA????DNA??
  • ?-35TTGACA?-10TATAAT
  • ?-35?????
  • -10Pribnow

???
????????????,???????????
11
???????????
  • Lac operon???? Plac?-10

Trp operon????Ptrp?-35
Ptac
Ptac-17
12
???????????
  • ?????????????,????????????,???????????RNA?????????
    ???
  • ?????,O?????????????????
  • ???????????

13
???????????
  • ????? ?????,?????????????
  • ??????????????????

14
???????????
  • ?????????????(P)?????(O)???

P?O?????
15
???????????
Lac
Trp
16
??????????????
17
?????
  • ????????????-???????-?????????-??????????
  • ?????,?????O???,??RNA??????
  • ?????,??????????,??????????,?????O????

18
(1kb)
(155000)
?
19
??????
  • ???????5?????
    D?E?????????????? C??????????????
    B?A?????????????
  • ?????????????????????
  • ??????????

20
??????????
(-)
()
21
?????????????
  • ?????????????(???)?????????????
  • ??????(?????)??????DNA????
  • ??
    ?????????,???????

22
?????????????
  • ????? ??????

???? ????
23
??cAMP??????
  • ???????????,?????????

24
??cAMP??????
  • ???????????????
  • ?????
  • CAPcatabolite gene activator protein
    ??????????,?cAMP??
  • cAMP-CAP??????DNA???CAP??,??????????
  • CAP????PO??,??????

25
??cAMP??????
  • ???????????????????cAMP????,??????????
  • ?????????? cAMP????, cAMP-CAP?????,
    cAMP?CAP??,??CAP????,????????????,?????????

26
??cAMP??????
1
27
???????
  • B?A?D?????,???????????
  • CR1(????),????R2?
  • ???initiator(I)
  • R1 ?R2?????,????????????
  • ???????????R1?R2?????????

28
???????
29
???????????????
  • ???regulon
    ?????????????,??????????????????????
  • ???? ????????????????????,???????????????,??????,
    ????????????

30
?????
31
SOS????????
  • DNA????????????????
  • LexA??????????????
  • recA??????RecA?????LexA???
  • LexA??recA??,RecA?????LexA??,?????????,???????????
    ?????????

32
SOS????????
33
???????????????
  • ???????????????
  • ???30?bp,10???
  • ????????,23??????
  • ???????????????
  • ??????????????????
  • ????????
  • ?????????????????

34
?????????
  • ???DNA??? ??
  • ???????????,????????,?????????????

35
?????????
  • ???????(HGP) human genomic
    project
    ????????30????????????
  • ??????????,??????,???????,??????,????????????

36
HGP???
  • ????????????????
  • ??????????????????????????DNA?????
  • ??DNA??????DNA????????
  • ????????????????????????????
  • ???????????????????

37
??????????
  • ????molecular recognition
    ??DNA-???????-??????????????,?????????

38
??????????
  • TATA box-30?
  • CAAT box ???
  • GC box
  • ??????(USA) upstream activator
    sequence
  • ??????????-200bp
  • ???TATA box?????

39
??????
  • ???enhancer
    ?????????????????,???????????????????????
  • ????????,??????????
  • ??????????

40
??????????
  • ????????????????????,??????????????
  • ???????????????????????????????

41
????RNA pol II?????
42
RNA???II?????
43
????????
  • TFIID???? DNA?????TATA?????????
  • TATA?TFIID?TFIIA?TFIIB?RNApolII?TFIIF?TFIIE???????
    ???(PIC)?

44
????????
  • ??DNA???????????,??????????????DNA???? ?
  • DNA??????????????,??????-???????????DNA?
  • ???-????DNA-??????,??????????
  • ????????????????,?????????????

45
??????????????????
  • ??????????????????DNA???????????????????????
  • ??(motif)??????????????????
  • ?DNA??????,??????????
  • ??????????????????????????

46
??????????????????
  • DNA????????? ????

??????????
????
??????????
47
??-??-?????-?-??
  • ???????-???????,???DNA??????

48
??
  • ??????????
  • ??(Zinc finger)????????,????????????????????
  • Cys2/His2?
    Cys-X24- Cys-X3-Phe-Leu- X2 -His-
    X3- His
  • Cys2/ Cys2?
    Cys-X2- Cys-X13 -Cys-X2- Cys
  • ?????????DNA??????,??5 ?????

49
??
50
?????
  • ?????(Leu zipper)
    ???????????????????????
  • DNA?????C?,??7????????????
  • ?????????? 3.6 ???????????????????????????,???????
    ?

51
?????
???????? DNA?????C ?,?? ???????? ???
52
???????
  • ???oncogene,onc
    ???????DNA??? ??????????,??????????????????
  • ????????????????
  • ???????????????
  • ????(pro-onc)
    ????????????????

53
???????
  • ?????????????
  • ???????
  • ???????
  • ??????

54

?????????????
  • ?????V-onco
  • ?????c-onco
  • ??????????????,???????????,?????? ???
  • ???????????????????,???????

55
?????????
  • ??????????????????
  • ????????
  • ??GTP????????????
  • ??DNA?????????,?????????

56
????????
  • src??src?abl?fes?fgr?ros ???????
  • ras??Ha-ras?Ki-ras?N-ras
    ??????
  • myc??C-?N-?L-myc?fos?myb DNA???????????
  • sis????????
  • erb??erbA?B?mas?trk ???????

57
????????
  • ???
  • ???????
  • ?????
  • ????

58

????????
  • GF-??-??-DNA??????

59
????????
  • ???onc ? GF ? ?? ? ???????
  • ???
  • GF
  • onc?? GF ?????????
  • GF

60
??????
  • ????tumor suppressor gene
  • Rbretinoblastoma,??????? ???????????
  • Rb????13????,200kb,27????,??928????
  • Rb??????????????????

61
??????
  • ???????????????????????????,??????????????????????
    ??

62
????
  • ???????
  • ???????
  • ???????
  • ???????
  • ?????????
  • ?????????????
  • ?????????????
  • ??HTH,HLH?????????
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