mitochondrium – peroxisome - chloroplast outer membrane inner membrane crista matrix dr. habil....
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Mitochondrium – Peroxisome - Mitochondrium – Peroxisome - ChloroplastChloroplast
outer membraneinner membrane
crista matrix
Dr. habil. Kőhidai LászlóAssoc. Prof.
Dept. Genetics, Cell & ImmunobologySemmelweis University
2008
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HistoryHistory
AltmannAltmann – describes Mch – describes Mch BendaBenda -- name „Mitochondrium” name „Mitochondrium”
was was given by him given by him WarburgWarburg - invetigated the - invetigated the
enzymes enzymes of respiratory of respiratory chain chain
Lehninger Lehninger – described oxydative – described oxydative phosphorylation phosphorylation
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MorphologyMorphology
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Network of Mch in a Network of Mch in a fibroblast cell fibroblast cell
Detection of ATP-syntaseDetection of ATP-syntase
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Characteristic dataCharacteristic data
• Size:Size: 7 x 0.5 7 x 0.5 mmBUT: wide range in different cell types !BUT: wide range in different cell types !
• Number: depends on the energy Number: depends on the energy requirements/budget of the cellrequirements/budget of the cell
sperim - 24sperim - 24WBC. - WBC. - 300300liver cell - 500-2500liver cell - 500-2500
Chaos-Chaos - Chaos-Chaos - 500.000 !500.000 ! amebaameba
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CompositionCompositioncompartmentalisationcompartmentalisation
Outer membraneOuter membrane• poor in proteinspoor in proteins• characteristic protein: characteristic protein: porinporin• ((-sheet– trimers-sheet– trimers form channels)form channels)• permeability up to permeability up to 5000 dalton5000 dalton
Inner membraneInner membrane• 70% proteins70% proteins• ee-- - transporter chaini - transporter chaini• ATP synthesisATP synthesis• other point impermeable – 20% other point impermeable – 20% cardiolipincardiolipin
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MatrixMatrix
• Pyruvate dehydrogenase complexPyruvate dehydrogenase complex• Enzymes of citric acid cycleEnzymes of citric acid cycle• Enzymes of Enzymes of -oxydation of fatty acids-oxydation of fatty acids• Enzymes of amino acid oxydationEnzymes of amino acid oxydation
• DNA, ribosomesDNA, ribosomes• ATP, ADP, PATP, ADP, Pii
• MgMg2+2+, Ca, Ca2+2+, K, K++
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Inner membrane of MchInner membrane of Mch
cristacrista
tubulartubular
berry-likeberry-likefingerprint-likefingerprint-like
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Localization in the cellLocalization in the cell
Basal striation
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Mch as osmotic regulator of Mch as osmotic regulator of the cell the cell
Significant HSignificant H220 ration of matrix moves to 0 ration of matrix moves to the intermembraneous space and forms a the intermembraneous space and forms a „„condensedcondensed” comformation” comformation
normalnormal condensedcondensed
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Relation of biochemical processes Relation of biochemical processes
in Mch.in Mch. pyruvate
fatty acid
Acethyl-CoA
Citric acid cycle
CO2
NADH+HFADH2
O2
H2O
ATP
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Terms of Chemiosmotic Terms of Chemiosmotic theorytheory
• Mch. Respiratory chain – moves electronsMch. Respiratory chain – moves electrons - pumps H- pumps H++ into into
intermembrane spaceintermembrane space• Mch. ATP synthase works also as a HMch. ATP synthase works also as a H+ + pump.pump.
• Reversible mechanism:Reversible mechanism:
• Several carrier molecules for metabolites, ions – in the inner Several carrier molecules for metabolites, ions – in the inner membrane of Mch. membrane of Mch.
• Other point of the inner membrane of Mch. is impermeable for Other point of the inner membrane of Mch. is impermeable for HH++ and OH and OH--. .
H+ in ATP synthesis
ATP cleavageH+ out
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I.I.
II.II.III.III. IV.IV.
UQUQ
H H ++ H H ++ H H ++
Matrix
Intermembranespace
I.I. NADH dehydrogenaseNADH dehydrogenaseII.II. Succinyl dehydrogenaseSuccinyl dehydrogenaseIII.III. Ubiquinone – cytochrom c oxydoreductaseUbiquinone – cytochrom c oxydoreductaseIV.IV. Cytochrom oxydaseCytochrom oxydase
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Enzyme systems of Enzyme systems of inner membrane in Mchinner membrane in Mch
I.I.II.II. III.III.
IV.IV.
e e --
H H ++Acidic pHAcidic pHRedox potentialRedox potential INCREASING:INCREASING: I. < III. < IV.I. < III. < IV.
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Matrix
Matrix
Intermembrane space
Intermembrane space
Resting phase
Ionophore treated (Valinomycin)
[H+]=10-9 M
[H+]=10-9 M
[H+]=10-9 M
[H+]=10-7 M
KK++
KK++
[K[K++] = [Cl] = [Cl--] = 0.1 M] = 0.1 M
[K[K++]<[Cl]<[Cl--]]
ATPH+
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Electrochemical proton-Electrochemical proton-gradientgradient
pH gradientpH gradient membrane-potentialmembrane-potential
ATP synthesisATP synthesis
pH V
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b-c1 complex
Q
cyt c
cytochrome oxydase
NADH dehydrogenase
OO22 HH22OO
NADHNADH NADNAD++
HH++
Electron transportElectron transportin Mch in Mch
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Knob-like protusions of the Knob-like protusions of the inner Mch membraneinner Mch membrane
headhead
basisbasis
ATP-synthaseATP-synthase
proton carrierproton carrier
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Structure of ATP-synthaseStructure of ATP-synthase
F1 ATP-ase(6 subunits)
Transmembrane H+ carriers (9 subunits)
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ATP-synthaseATP-synthase
- rotor
a, b, - stator
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Experimental evidenceExperimental evidence
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H+
H+H+
H+
H+
H+H+
ADP + Pi
ATP
Bacterio-rhodopsin ATP synthase
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ADP + Pi
ATP
ADP + Pi
ATP
H +
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Transports required by Transports required by ATP-synthaseATP-synthase
Antiport Symport
Adenine nucleotie translocaseAdenine nucleotie translocase Phosphate translocasePhosphate translocase
H+
H+H+
H+
H2PO4-
H2PO
4-
ADP
ADP
ATP
ATP
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I. III. IV.II.
H+ H+ H+H+
HeaHeatt
Brown adipose tissue Brown adipose tissue
MchMch.
thermogenin
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TransportsTransportsSignal seq.
Receptor
Contact-pointTransloconGIP
! Hsp70 !! Hsp70 !
Mch. Hsp-kMch. Hsp-k
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Origin of MitochondrionOrigin of Mitochondrion
• De novoDe novo synthesis synthesis• DivisionDivision
• Endosymbiont theoryEndosymbiont theoryArchaic Cyanobacteria – 1.5 x 109 yrs ago
porin (Gram (-) bact.)porin (Gram (-) bact.) electron transport chainelectron transport chain ATP synthaseATP synthase mt DNSmt DNS ribosomeribosome
BUT:BUT: GiardiaGiardia has NO Mch (anaerob) has NO Mch (anaerob)
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Origin of Mitochondrion 2Origin of Mitochondrion 2
• Composition of outer membrane – Composition of outer membrane – eukaryotic type; the eukaryotic type; the inner membrane is inner membrane is composed by prokaryotic composed by prokaryotic componentscomponents
• Mch has own protein synthetic system, Mch has own protein synthetic system, the starter amino acid is the starter amino acid is formyl-Metformyl-Met
• Inhibitors of protein synthesis in Mch: Inhibitors of protein synthesis in Mch: antibioticsantibiotics acting on bacterial protein acting on bacterial protein synthesissynthesis
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Network of Mch in budding Network of Mch in budding
S. cerevisiaeS. cerevisiae
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IsotopeIsotopelabellinglabelling
CELL PROLIFERATIONCELL PROLIFERATION
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mt-DNAmt-DNA
• ring shape, 5 –10 copies/Mch.ring shape, 5 –10 copies/Mch.• 20 Mch genes are coding proteins20 Mch genes are coding proteins• there are no intronsthere are no introns• few regulator genesfew regulator genes• no histonsno histons• repliation, transcription, translation repliation, transcription, translation • 22 tRNA, 2 rRNA22 tRNA, 2 rRNA
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Human mt-DNAHuman mt-DNA
rRNArRNA
ND1; 2ND1; 2
I.I.II.II.ATP-syntaseATP-syntase
III.III.
ND3-6ND3-6
Cyt bCyt b
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Mch myopathyMch myopathy
Singlefibre
Clusters of fibers
Crystallinestructurein the matrixof Mch
Mass ofpathologicMch-s
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PeroxisomePeroxisome
•Single membrane coverageSingle membrane coverage
•Selective import of proteinsSelective import of proteins
•No genomeNo genome
•Oxydative enzymes:Oxydative enzymes:
catalasecatalase
urate oxydase urate oxydase (crystalloid)(crystalloid)
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Origin of peroxisomeOrigin of peroxisome
• OO22 producing bacteria – early phase of phylogeny producing bacteria – early phase of phylogeny
• the Othe O22 is toxic to other cells/organisms is toxic to other cells/organisms
• peroxisomeperoxisome could neutralize the O could neutralize the O2 2 and its radicalsand its radicals in the cytoplasmin the cytoplasm
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Functions of peroxisomeFunctions of peroxisome
•RHRH22 + O + O22 R + R + HH22OO2 2 (toxic) (toxic)
•HH22OO22 + R’H + R’H22 R’ + R’ + 2H2H22OO
catalase (liver, kidney)catalase (liver, kidney) -oxydation: alkyl chain - (C-oxydation: alkyl chain - (C22
ac.CoA)nac.CoA)n
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Peroxisomes in plantsPeroxisomes in plants
• In plantsIn plants
leafs: leafs: photorespiration - Ophotorespiration - O22 consumption; COconsumption; CO2 2
germination: glyoxylate cycle germination: glyoxylate cycle (glyoxysome)(glyoxysome)
Fatty acidFatty acid ac. CoA succinate ac. CoA succinate glucoseglucose
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Peroxisome in plantsPeroxisome in plants
glyoxisome
lipid
peroxisome
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PeroxisomePeroxisome
• import of proteins
- 3 amino acid signal sequence on C-terminal- PAF-1 – peroxisomal assembly factor-1
PAF-1
• Zellweger syndrome protein to be impoted is affected- empty peroxisomes
(brain, liver, kidney affected; lethal)
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Gene transfection -
Zellweger syndromePXR1
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ChloroplastChloroplast
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Thylakoid membrane
(light reaction)
Stroma(dark reaction)
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Oxygen-requiring bacteria move to regions where oxygen is being liberated by photosynthesis
Engelmann-experimentEngelmann-experiment(1894)(1894)
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Photopigments of chloroplast
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Z-scheme ofZ-scheme ofelectron transportelectron transport
in chloroplastin chloroplast
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Chloroplast – NAPH / ATP synthesisChloroplast – NAPH / ATP synthesis
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Comparison of ATP generation Comparison of ATP generation in Mch - Chloroplastin Mch - Chloroplast