Kutenderera kweKrebs: Kutenderera kweCitric Acid muEnergy Metabolism
Kutenderera kweKrebs, kunozivikanwawo sekuti kutenderera kwecitric acid, inyaya yemakemikari inoita basa rakakosha mukushandiswa kwemasero. Yakatumidzwa zita raHans Krebs, musayendisiti wekuGermany-Britain uyo akaiwana muna 1937, ndiyo musimboti wekushandiswa kwesimba muzvisikwa zve aerobic. Muchinyorwa chino, tichanyatsoongorora mashandiro, basa, uye kukosha kwekufamba uku mu biology yemazuva ano.
Nhanganyaya kuKrebs Cycle
Kutenderera kweKrebs kunoitika mumitochondria, "simba" resero, inova ndiyo nzvimbo huru dzekugadzirwa kweadenosine triphosphate (ATP), iyo inotakura simba remasero. ATP inoumbwa zvikuru kuburikidza ne oxidative phosphorylation, uye kutenderera kweKrebs kunoshanda sedanho rakakosha mune izvi. Kutenderera uku chikamu chenzira yakakura ye metabolic inosanganisira glycolysis uye electron transport chain.
Usati wapinda muKrebs cycle, pyruvic acid molecule, chigadzirwa cheglycolysis, inoshandurwa kuita acetyl coenzyme A (acetyl-CoA). Maitiro aya anoburitsa molecule imwe chete yecarbon dioxide uye anoburitsa NADH kubva kuNAD+, iyo inoshandiswa mu electron transport chain kugadzira ATP.
Matanho ekutenderera kweKrebs
Kutenderera kwe citric acid kune matanho masere akakosha, rimwe nerimwe richifambiswa ne enzyme chaiyo. Matanho aya ndeaya anotevera:
1. Kuumbwa kweCitrate: Acetyl-CoA inosanganisa boka rayo reacetyl nemorekuru ine oxaloacetate ine kabhoni ina, ichigadzira citrate ine kabhoni nhanhatu, kuburikidza nekushanda kweenzyme citrate synthase.
2. Kuchinja kweCitrate kuita Isocitrate: Kuburikidza ne enzyme aconitase, citrate inochinja kuita isocitrate kuburikidza nekuumbwa kwemolekyu yepakati yecisocitrate.
3. Kubvisa kabhoni muropa reIsocitrate: Isocitrate inobviswa kabhoni neenzyme inonzi isocitrate dehydrogenase, ichiishandura kuita alpha-ketoglutarate, ukuwo ichiburitsa kabhoni dhayokisaidhi uye ichishandura NAD+ kuita NADH.
4. Kuumbwa kweSuccinyl-CoA: Alpha-ketoglutarate inoburitswa ne oxidative decarboxylation ne enzyme alpha-ketoglutarate dehydrogenase, ichiburitsa succinyl-CoA uye ichiburitsa carbon dioxide yechipiri, pamwe nekugadzira NADH.
5. Kuumbwa kweSuccinate: Kuburikidza nekuita kunokonzereswa ne succinyl-CoA synthetase, succinyl-CoA inoshandurwa kuita succinate, iyo inogadzirawo molekyuru imwe yeguanosine triphosphate (GTP), iyo inogona kushandurwa nyore nyore kuita ATP.
6. Kubviswa kweSuccinate kuenda kuFumarate: Enzyme inonzi succinate dehydrogenase inokonzeresa kusvibiswa kwesuccinate kuenda kufumarate. Izvi zvinogadzirawo FADH2 kubva kuFAD, iyo inozoshandiswa muketani yekufambisa maerekitironi.
7. Kunyungudutsa kweFumarate kuenda kuMalate: Enzyme iyi fumarase inokurudzira kuwedzerwa kwemorekuru yemvura kufumarate, zvichiburitsa malate.
8. Kubviswa kweMalate muOxaloacetate: Danho rekupedzisira rinoitwa ne malate dehydrogenase, iyo inodzoreredza malate kuita oxaloacetate, zvichiburitsa NADH yekupedzisira kubva kuNAD+.
Nekugadzirwa patsva kweoxaloacetate, kutenderera kwacho kwagadzirira kutangazve nemamorekuru matsva e acetyl-CoA.
Basa reKrebs Cycle muSimba reMasero
Nekutenderera kwega kwega kweKrebs cycle, acetyl-CoA imwe chete inoshandurwa zvachose, ichigadzira mamorekuru maviri ecarbon dioxide, mamorekuru matatu eNADH, molecule imwe yeFADH2, uye imwe yeGTP/ATP. NADH neFADH2 zvinozoiswa muketani yekufambisa maerekitironi, uko simba rakachengetwa rinoshandiswa kugadzira proton gradient inosimudzira kugadzirwa kweATP. Saka, nepo Krebs cycle isingagadzire ATP yakawanda zvakananga, mupiro wayo mukuru uri mukugadzirwa kwezviyero zvinoderedza zvinotungamira oxidative phosphorylation.
Kukosha Kwezvisikwa KweKrebs Cycle
Kutenderera kweKrebs ndiko kuri pakati pekushandiswa kwesimba remasero, zvichibvumira masero kushandisa simba rinobva kune zvakasiyana-siyana zvinovaka muviri. MaAmino acids, mafuta acids, uye makabhohaidhiretsi zvinogona kupatsanurwa kuita mamorekuru anogona kupinda mudenderedzwa iri. Senzvimbo huru yekubatana mukushandiswa kwesimba, kutenderera kwecitric acid kunopa nzira yakakosha yekubatana nekugadzirisa nzira dzakasiyana dzekushandiswa kwesimba.
Pamusoro pezvo, zvinhu zvinobva mukutenderera uku zvinoshandiswawo mukugadzirwa kwemafuta acids, amino acids, uye mamwe mamorekuru ehupenyu, zvichiratidza kushanduka-shanduka kwayo uye basa rayo guru mukuvaka kwemasero.
Mutemo weKrebs Cycle
Basa reKrebs cycle rinodzorwa nezvinodiwa nesimba remasero uye kuwanikwa kwesubstrate. Dzimwe nzira dzekutonga dzinosanganisira:
- Kudziviswa Kwemhinduro: Mamorekuru akadai seATP, NADH, uye zvigadzirwa zvavo zvinogona kudzivirira kushanda kwema enzymes mudenderedzwa, zvichideredza kumhanya kwemaitiro kana simba rakwana.
– Zvinoita kuti sero rishande: ADP kana AMP, zvinoratidza kuti sero rinoda simba, zvinogona kumutsa ma enzymes kuti rikurumidze kutenderera.
– Kuwanikwa kweSubstrate: Huwandu hweoxaloacetate kana acetyl-CoA hunogona kukanganisa mwero wedenderedzwa.
Zvinokonzera Kurapa uye Kutsvagurudza
Kusashanda zvakanaka kweKrebs cycle kunogona kukonzera zvirwere zvakasiyana-siyana, zvinosanganisira kenza, chirwere cheshuga, uye zvirwere zvetsinga. Semuenzaniso, mamwe masero ekenza anoratidza shanduko mudenderedzwa iri kutsigira kukura kusingadzoreki, uye nekudaro, zvikamu zvedenderedzwa reKrebs zvinowanzo tariswa mukugadzirwa kwemishonga yekenza.
Tsvagiridzo inoramba ichinyatsonzwisisa kudzorwa kwedanho iri uye hukama hwaro nezvirwere zvevanhu. Kunzwisisa kwakadzama kunogona kutungamirira mukubudirira mukuongorora, kurapwa, uye kudzivirira zvirwere zvakasiyana-siyana.
Mhedziso
Kutenderera kweKrebs ndiko kuri pakati pekushandiswa kwesimba remasero. Kunobatanidza nekutsiva dzimwe nzira dzakawanda dzekugadzirisa, zvichitsigira kugadzirwa kweATP uye kugadzirwa kwezvinhu zvakakosha mumasero. Sechikamu chakakosha chekugadzirisa, kunzwisisa kwakakwana kwekufamba kwecitric acid kune zvakunoreva zvakawanda kubva pasainzi yekutanga kusvika pakushandiswa kwekiriniki. Kuburikidza nekutsvaga kwakawanda, kutenderera uku kucharamba kuri nzvimbo yakakosha yekudzidza mu biochemistry nemishonga.
