Basa reMitochondria mukugadzirwa kwesimba remasero
Mitochondria, inowanzonzi "simba resero," inhengo dzinokosha dzinowanikwa mu cytoplasm yemasero ese eukaryotic. Aya maumbirwo ane mativi maviri anozivikanwa nebasa rawo mukugadzira simba kuburikidza nemaitiro e biochemical akakosha mu metabolism uye simba remasero. Kunzwisisa basa re mitochondria mukugadzirwa kwesimba remasero kunoratidza zvinhu zvakakosha zve biology, mushonga, uye bioenergetics.
Maumbirwo eMitochondria
Mitochondria inoratidzwa nechimiro chayo chakasiyana, chine membrane yekunze, nzvimbo yepakati pemembrane, membrane yemukati, uye matrix. Kamudzira kekunze kanopindika zvishoma, zvichiita kuti mamorekuru anosvika saizi yakati apfuure zvakasununguka. Kamudzira kemukati, kune rumwe rutivi, kanosarudza zvakanyanya uye kanosanganisira mapete anozivikanwa se cristae. Makristae aya anowedzera nzvimbo yepamusoro yemaitiro e biochemical. Matrix, yakavharirwa nemembrane yemukati, ine ma enzymes, mitochondrial DNA (mtDNA), ribosomes, uye solutes dzakasiyana-siyana dzinobatsira pakushanda kwe mitochondrial.
Mabasa eMitochondria
Kugadzirwa kweATP
Basa guru remitochondria mukugadzirwa kwesimba remasero riri mukukwanisa kwayo kugadzira adenosine triphosphate (ATP), iyo inonyanya kukosha musimba remasero. Maitiro aya, anozivikanwa se oxidative phosphorylation, anosanganisira maitiro akasiyana-siyana e redox anoitika mukati memukati memitochondrial.
Oxidative Phosphorylation
Oxidative phosphorylation ine zvikamu zviviri zvikuru: Electron Transport Chain (ETC) uye ATP Synthase.
Cheni yeKutakura Maerekitironi (ETC):
ETC imhando yemapuroteni akawanda uye mamorekuru madiki ari mukati memukati memitochondrial membrane. Inosanganisira Complexes I, II, III, uye IV, pamwe chete nema electron carrier maviri, ubiquinone (coenzyme Q) uye cytochrome c. Maerekitironi anobva mukuoxidation yezvinovaka muviri, zvakaita seglucose nemafuta acids, anotamiswa kuburikidza nema complexes aya, zvichikonzera kupomba kwemapurotoni (H⁺) kubva mu matrix kuenda munzvimbo yepakati pemembrane. Kupomba uku kweprotoni kunogadzira electrochemical gradient, inozivikanwa seproton motivation force (PMF).
Kugadzira ATP:
ATP Synthase ienzyme inoshamisa iri mukati memukati memitochondrial membrane. Inoshandisa simba kubva mukuyerera kwemaprotoni kudzokera mu matrix—inotungamirwa nePMF—kuti iwedzere kugadzirwa kweATP kubva kuadenosine diphosphate (ADP) uye inorganic phosphate (Pi). Maitiro aya, anozivikanwa sechemiosmosis, ndiwo musimboti wekufema kwemasero, achibatanidza simba remakemikari rezvinovaka muviri nekushanda kwemasero muchimiro cheATP.
Mamwe Mabasa muMetabolism
Kunze kwekugadzirwa kweATP, mitochondria ine basa rakakosha munzira dzakasiyana siyana dzekugadzirisa muviri, kusanganisira citric acid cycle (Krebs cycle), fatty acid oxidation, uye amino acid metabolism. Mukati me mitochondrial matrix, Krebs cycle inogadzira ma electron carriers NADH neFADH₂, izvo zvinodya muETC. Pamusoro pezvo, mafuta oxidation kuburikidza ne β-oxidation anoitika mu mitochondria, zvichipa imwe nzira yekuwana ma electron ane simba rakawanda.
Apoptosis uye Kuratidza
Mitochondria ine chekuita nekudzora kufa kwemasero kwakarongwa (apoptosis). Inoburitsa cytochrome c nezvimwe zvinhu zvinosimudzira kufa kwemasero mu cytosol nekuda kwekushushikana kwemasero kana kukuvara. Kuburitswa uku kunotanga kushanda kwe caspases, izvo zvinoronga kuputswa kwezvikamu zvemasero, zvichiita kuti masero akakuvara kana asingadiwe abviswe. Uyezve, mitochondria inobata mabasa ekutumira masaini mukati memasero, ichikanganisa mhinduro dzemasero ku hypoxia, kugadzirwa kweROS (reactive oxygen species), uye calcium dynamics.
Kugadzirwa kweReactive Oxygen Species (ROS)
Kunyange zvazvo ETC ichikosha pakugadzirwa kweATP, inogadzirawo ROS sezvinhu zvinobva mumasero. Mamorekuru aya anogona kukanganisa zvikamu zvemasero kana akasatarisirwa zvakanaka. Mitochondria ine masisitimu ekudzivirira mabhakitiriya ekuderedza kukuvara kweROS, ichichengetedza kuvimbika kwemasero. Zvinofadza kuti, huwandu hushoma hweROS hunogona kushanda semamorekuru ekuratidza zviratidzo, zvichichinja maitiro akadai sekukura kwemasero uye kugadzirisa kushushikana.
Maitiro eMitochondrial
Mitochondria inhengo dzinoshanda dzinogara dzichisangana uye dzichibatana. Maitiro aya akakosha pakuchengetedza mashandiro emitochondria uye kugadzikana kwayo. Kusangana kunobvumira kupararira kwemitochondria panguva yekupatsanurwa kwemasero uye kunobatsira kubvisa mitochondria yakakuvara kuburikidza nemitophagy. Kubatana, kune rumwe rutivi, kunovandudza mashandiro emitochondria nekusanganisa zviri mukati memitochondria yakakuvara zvishoma nezvine hutano, zvichideredza zvikanganiso.
DNA yeMitochondrial uye Nhaka
Kusiyana neDNA yenyukireya, mtDNA inogarwa nhaka kubva kuna amai uye inochengetedza zvikamu zvakakosha zve oxidative phosphorylation system. Zvisinei, mapuroteni mazhinji e mitochondrial anonyorwa neDNA yenyukireya uye anopinzwa mu mitochondria. Kuchinja-chinja mu mtDNA kunogona kutungamira kuzvirwere zve mitochondrial, kazhinji zvichikanganisa matishu ane simba rakawanda, senge tsandanyama nehurongwa hwetsinga.
Zvinokonzera Hutano neZvirwere
Kukosha kwekugadzirwa kwesimba remitochondria nemasero kunoratidza kubatanidzwa kwaro muzvirwere zvakasiyana-siyana. Kusashanda zvakanaka kwemitochondria kunobatanidzwa mukusagadzikana kwemuviri, zvirwere zvinokanganisa mashandiro etsinga (zvakadai seParkinson neAlzheimer), zvirwere zvemwoyo, uye kukwegura.
Matambudziko eMetabolic
Zvirwere zvakaita sekufuta uye chirwere cheshuga cherudzi rwechipiri zvine chekuita nekutadza kushanda zvakanaka kwemitochondrial. Kusakwanisa insulin, chiratidzo chechirwere cheshuga cherudzi rwechipiri, kunobatanidzwa nekudzikira kwesimba remitochondrial oxidative, zvichikanganisa metabolism yeglucose nemafuta.
Neurodegenerative Diseases
Kusashanda zvakanaka kwemasero eropa (Mitochondrial dysfunction) chinhu chikuru chinokonzera zvirwere zvinoderedza mashandiro etsinga. Semuenzaniso, muchirwere cheParkinson, kushomeka kwemasero eropa muETC kunotungamira mukuwedzera kwekushushikana kwemasero eropa (oxidative stress) uye kufa kwemasero eropa mushure mekufa. Saizvozvowo, kusashanda zvakanaka kwemasero eropa (mitochondrial dynamics) uye nzira dzekudzora hunhu hwemuviri zvinobatsira mukukura kwechirwere cheAlzheimer.
Zvirwere zvemoyo
Zvirwere zvemwoyo zvinokanganiswa nehutano hwemitochondrial, sezvo moyo uchinyanya kuvimba nekugadzirwa kweATP yemitochondrial. Kusashanda zvakanaka kwemitochondrial kunogona kukonzera kutadza kwemoyo uye kukuvara kwe ischemia-reperfusion nekuda kwekushaya simba rakawanda uye kukuvara kwakanyanya kwe oxidative.
Kukwegura
Kukwegura kunobatanidzwa nekudzikira kwebasa remitochondrial uye kuwedzera kwemutoro wekuchinja kwemasero mu mtDNA. Kudzikira uku kunoguma nekudzikira kwekugadzirwa kweATP uye kuwedzera kwekugadzirwa kweROS, zvichikonzera kudzikira kwemuviri kunoonekwa nekukura.
mhedziso
Mitochondria inokosha pakugadzirwa kwesimba remasero, ichitungamira maitiro ekuchengetedza hupenyu kuburikidza nekugadzirwa kweATP uye kubatanidzwa kwemetabolism. Hunhu hwavo hwekuchinja uye kubatanidzwa kwavo mumabasa akakosha emasero kunopfuura kungoshandisa bioenergetics chete, zvichiita kuti zvive zvakakosha pakupona kwemasero, kufa, uye kutumira masaini. Kunzwisisa biology yemitochondrial hakungotsananguri chete maitiro ekutanga emasero asiwo kunoburitsa nzira dzekurapa dzezvirwere zvakasiyana-siyana zvakakonzerwa nekusashanda zvakanaka kwemitochondrial. Sezvo sainzi ichifambira mberi, kuramba uchiongorora mabasa emitochondrial kunovimbisa kuvhura miganhu mitsva mukurapa nebiochemistry, zvichisimbisa chinzvimbo chavo semasimba emasero akakosha muhupenyu.
