aff_hb - mb_2010
TRANSCRIPT
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HEMOGLOBIN
MIOGLOBINdan
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Oksidasi bahan makanan
merupakan tahapan penting dalam penyediaanenergi bagi sel.
oksidasi glukosa oleh oksigenmenghasilkanenergi 18 kali lebih besar daripada tanpaoksigen.
Mekanisme pemasok oksigen pada vertebrata
1.Sistem peredaran darah
2.Molekul pembawa oksigen untuk mengatasi rendahnya kelarutan oksigen
dalam air.
pada vertebrata: hemoglobindan myoglobin.
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Hemoglobin terdapat dalam sel darah merah,
pembawa oksigen dalam darah
Fngsi!transport karbon dioksida dan
ion hydrogen"
Mioglobin
terdapat di otot, menyediakan #adangan oksigen dan
mempermdah pergerakan oksigen di otot"
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HemoglobinHemoglobin
heterotetramer!
"#$%2
heme&globin
ea'h subunit o(
Hb is a globular
protein with an
embedded heme
"human! adult %
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HEME $Feroprotoporphyrin%HEME $Feroprotoporphyrin% &erdiri dari protoporphyrin I' dan Fe&erdiri dari protoporphyrin I' dan Fe
&erikat pd polipeptida Hb(Mb via ikatan hidro)ob&erikat pd polipeptida Hb(Mb via ikatan hidro)ob Memiliki po#ket pengikat OMemiliki po#ket pengikat O**, +O, +O**, H, H**OO
oordinasi pengikatan tiga molekl tsb di-elaskanoordinasi pengikatan tiga molekl tsb di-elaskanoleh Bohroleh Bohr $E)ek Bohr%$E)ek Bohr%
.)initas +O pada Hb / daripada 0 molekl tsb,.)initas +O pada Hb / daripada 0 molekl tsb,sehingga gas +O dapat memblok pengikatan O*sehingga gas +O dapat memblok pengikatan O*pada Hbpada Hb
sangat toksiksangat toksik
1ada Hb1ada Hb ! Fe$II%! Fe$II% MetHbMetHb ! Fe$III%! Fe$III%
Oksidasi Fe$II% men-adi Fe$III% oleh OOksidasi Fe$II% men-adi Fe$III% oleh O**dihalangidihalangi
oleh bagian hidro)ob pada strktr Hb mapnoleh bagian hidro)ob pada strktr Hb mapn
MbMb
MetHb(MetMb skar terbentkMetHb(MetMb skar terbentk
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http:))www.m(i.ku.dk)**aulev)'hapter8)images)8+.,pg
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deo-yMb
Myoglobin and Hemoglobin StructureMyoglobin and Hemoglobin Structure
o-yHb "Hb2%
O*
O*
O*
O*
/lu0-al0
/lu0-al0
o-yMb "Mb2%
O*
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Hb Heme Center ChangesHb Heme Center Changes
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. heme grop2#onsists o) a porphyrin $ion e dalam 'in'in heterosiklik%
3on e "o'tahedral group o( si- ligands%:
merupakan sisi pengikat oksigen
berikatan koordinasi dg 4 5 "pusat 'in'in%
berikatan dg protein globular via 'in'in
imida6ole pada residu 8 histidine
"di bawah 'in'in porphyrin%.
posisi ke 0 mengikat oksigen "reversibel%
-ygen binds in an 7endon bent7 geometry where one o-ygen
atom binds e and the other protrudes at an angle.
hen o-ygen is not bound! a very weakly bonded water
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H9M/;35H9M/;35
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9(ek ;ohr9(ek ;ohr
=apidly metaboli6ing tissues=apidly metaboli6ing tissues "'ontra'ting mus'le%"'ontra'ting mus'le%::
have a high need (orhave a high need (or 22
generate large amounts o( Hgenerate large amounts o( H>>and ?and ?22
"heterotropi' e((e'tors enhan'ing "heterotropi' e((e'tors enhan'ing 22
release%release%
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3epends on pH $4H56%, +O*, B1G $31G%, &emp
Faktor yang mempengaruhi pengikatan OFaktor yang mempengaruhi pengikatan O22
pH
B1G or &
right shi)t
pHB1G or &
le)t shi)t
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;ohr e((e't: pH;ohr e((e't: pH 'auses'auses 22binding releasing itbinding releasing it2!+ C*/2!+ C*/ 22binding "response to high altitude%binding "response to high altitude%**?2?2 de'reases de'reases 22bindingreleasing itbindingreleasing it
"
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a'tors that Modi(y Hb
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=eview o( =espiratory=eview o( =espiratory
9-'hange &
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Fetal HemoglobinFetal Hemoglobin
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Molecular and cellular changes HbSMolecular and cellular changes HbS
http:))www.si'kle'ellin(o.net)(iber(ormation.htm.
Caniel F. Harrington! C. F.! G. da'hi! and . 9. =oyer! Fr. 7889. F. Mol. ;iol. *9*$0%!+A84B@
Heme
:al
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Molecular and cellular changes of hemoglobin SMolecular and cellular changes of hemoglobin S
http:))www.emedi'ine.'om)ped)
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Effects of therapy with hydroxyureaEffects of therapy with hydroxyurea
http:))www.emedi'ine.'om)ped)
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=edu'ing the le-ibility o( the Main ?hain=edu'ing the le-ibility o( the Main ?hain
Stabili6ation o( e-posed loop by mutating /ly to *ro
Mutation: /I1*
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B.H.N 3I;
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Mengapa transport okigen di darah
memerlukan HbJ
Mengapa keberadaan oksigen di otot
,uga memerlukan MbJ