I-Cytosol: Ingxenye Engabonakali Yamaseli
Uma sifunda ngebhayoloji yamaseli, sivame ukugxila ezingxenyeni ezibonakalayo nezibonakala ngokucacile, njenge-nucleus, i-mitochondria, kanye ne-endoplasmic reticulum. Kodwa-ke, ngaphakathi kweseli kukhona indawo ebanzi kakhulu futhi evame ukunganakwa: i-cytosol. I-cytosol iwuketshezi oluyinkimbinkimbi lwangaphakathi kweseli lapho kwenzeka khona izinqubo ezibalulekile ze-metabolic kanye nezinye izingxenye zamaseli. Kulesi sihloko, sizohlola ukungena nokuphuma kwe-cytosol, indima yayo esitokisini, nokuthi kungani ibaluleke kangaka empilweni yamaseli.
Kuyini i-Cytosol?
Ngaphambi kokuqhubeka nengxoxo, kubalulekile ukuhlukanisa phakathi kwe-cytosol ne-cytoplasm. I-Cytosol yingxenye yoketshezi ye-cytoplasm, ngaphandle kwama-organelles nezakhiwo zangaphakathi kweseli njenge-cytoskeleton. Okwamanje, i-cytoplasm ihlanganisa konke okuqukethwe yiseli ngaphakathi kwe-plasma membrane, ngaphandle kwe-nucleus. Ngamanye amazwi, uma i-cytoplasm ifaniswa nedolobha, khona-ke i-cytosol ibiyoba imigwaqo nezindawo zomphakathi ezixhumanisa izakhiwo.
I-Cytosol ikakhulukazi ingamanzi, kodwa naphezu kwegama layo, "uketshezi lweseli," ayiwona amanzi ahlanzekile. Iqukethe usawoti oncibilikisiwe, ama-molecule e-organic, ama-ion, namaprotheni. Ukuvumelana kwayo kufana kakhulu nejeli ngenxa yokuba khona kwama-macromolecule namaprotheni ancibilikisiwe, okwenza kube yindawo efanelekile yokusabela kwamakhemikhali.
Ukwakheka kwe-Cytosol
I-cytosol iyinhlanganisela eyinkimbinkimbi yama-molecule ahlukahlukene. Cishe u-70-80% we-cytosol ngamanzi, odlala indima ebalulekile ekugcineni isimo seseli nokuvumela ama-molecule ukuthi anyakaze futhi enze ukusabela kwamakhemikhali. Ngaphezu kwamanzi, i-cytosol iqukethe:
1. Amaprotheni Nama-Enzyme: Amaprotheni ayisici esiyinhloko se-cytosol, okuhlanganisa nama-enzyme avuselela ukusabela okuhlukahlukene kwe-metabolic. Izibonelo zama-enzyme atholakala ku-cytosol zifaka ama-enzyme ayisithupha e-glycolysis pathway, asiza ekugayweni kwe-glucose ukuze ikhiqize amandla.
2. Ama-ion nosawoti: Ama-ion anjenge-potassium, i-sodium, i-magnesium, ne-calcium ayancibilika ku-cytosol futhi adlala indima ekulawuleni umsebenzi weseli ngokulawula amandla e-membrane kanye nezimpawu zeseli.
3. Ama-molecule Ezinto Eziphilayo: Lokhu kufaka phakathi ama-carbohydrate alula, ama-amino acid, ama-nucleotide, kanye nama-lipid. Lawa ma-molecule ezinto eziphilayo abalulekile ekwakhiweni kwama-macromolecule.
4. I-Cytoskeletal Filaments: Nakuba ingeyona ingxenye yoketshezi lwe-cytosolic, i-cytoskeletal filaments inikeza ukwesekwa kwesakhiwo kanye nezindlela zokuthutha ama-molecule nama-organelle ngaphakathi kweseli.
Imisebenzi ye-Cytosol
Nakuba ivame ukunganakwa, i-cytosol inemisebenzi ehlukahlukene ebalulekile:
1. Lapho Kwenzeka khona Ukwakheka Kwe-Metabolism: Izindlela eziningi ze-metabolic zamaseli, okuhlanganisa ne-glycolysis, zenzeka ku-cytosol. Ama-enzyme kanye nezingxenye zalezi zindlela zikhona ku-cytosol, futhi umkhiqizo we-glycolysis yi-pyruvic acid, engasetshenziswa kabanzi ku-mitochondria ukuze kukhiqizwe amandla engeziwe.
2. Ukuthuthwa Kwangaphakathi Kweseli: I-cytosol isebenza njengendawo lapho ama-molecule nama-organelle angahamba khona ngaphakathi kweseli. Ama-microtubules nama-microfilaments e-cytoskeleton ahlinzeka ngezindlela zokuthutha ama-vesicles nama-organelle ngaphakathi kwe-cytosol ngokusebenzisa izindlela zamaphrotheni e-motor njenge-kinesin ne-dynein.
3. Ukulawulwa kwe-Osmosis kanye ne-Cell Volume: Ukuhlushwa kwama-ion ku-cytosol kuthinta ingcindezi ye-osmotic, okuthi futhi kuthinte ukulawulwa kwevolumu yeseli. Lo mthetho ubalulekile ekugcineni impilo yeseli kanye nokuvimbela i-lysis noma ukuncishiswa kweseli ngenxa yezinguquko ekucindezelweni kwe-osmotic.
4. Ukudluliselwa Kwesignali: Izindlela eziningi zokudluliselwa kwesignali zincike kumaprotheni nama-ion ancibilikisiwe ku-cytosol. Lezi zibonakaliso zingavela ngaphandle kweseli futhi zibangele izimpendulo ezifana nokwanda, i-apoptosis, noma izinguquko ze-metabolic.
Ukuguqulwa kwe-Cytosol kumaseli ahlukene
Njengezinye izingxenye eziningi zamaseli, ukwakheka kanye nomsebenzi we-cytosol kungahluka kuye ngohlobo lweseli kanye nendawo ezungezile. Isibonelo, amangqamuzana emisipha adinga ukuhlushwa okuphezulu kwama-ion e-calcium ku-cytosol ukuze kube lula ukufinyela kwemisipha. Okwamanje, amangqamuzana ezitshalo namabhaktheriya angaba nezingxenye ze-cytosolic ezilungiselelwe ukugcina nokuguqula amandla ngaphansi kwezimo zemvelo ezimbi kakhulu.
I-Cytosol njenge-Target Yocwaningo
Ngenxa yokuthi imisebenzi emikhulu yamakhemikhali yenzeka ku-cytosol, akumangazi ukuthi ucwaningo olubalulekile lugxile ekulinganiseni amapharamitha e-cytosolic njenge-pH, ukuhlushwa kwe-ion, kanye ne-viscosity. Lezi zinguquko zingase zibe yimbangela yezifo eziningi kanye nezimo ze-pathological. Isibonelo, ukungasebenzi kahle kokulawulwa kwe-ion okubangelwa ukulimala kwamaprotheni e-membrane kungabangela izifo ezifana ne-cystic fibrosis.
Ku-pharmacology, i-cytosol nayo iyafundwa njengenhloso yokuthuthukiswa kwemithi. Amaprotheni aku-cytosol angasebenza njengezinhloso zama-molecule zamakhemikhali okwelapha, njengama-enzyme athile ahilelekile ezindleleni ze-metabolic zamaseli omdlavuza ezingase zivinjelwe ekwelashweni komdlavuza.
Isiphetho
I-cytosol ingase ingabi nezakhiwo eziningi ezihlaba umxhwele njengezinye i-organelles, kodwa idlala indima ebalulekile ekugcineni ukusebenza kwamaseli kanye nempilo yawo. Ngokwenza kube lula izinqubo ze-metabolic, ukulawula ukwakheka kwamakhemikhali angaphakathi, kanye nokuvumela ukuxhumana phakathi kwezingxenye zamaseli, i-cytosol ibalulekile empilweni yamaseli.
Ucwaningo lwe-cytosol luyaqhubeka nokukhula, futhi ngentuthuko kwezobuchwepheshe be-microscopy kanye nokuhlaziywa kwamakhemikhali, siyaqonda ngokwengeziwe ubunzima bomhlaba omncane ogcwalisa izikhala ngaphakathi kwamaseli. Ikusasa lalolu cwaningo lithembisa ukuqonda okujulile kokuthi izinguquko kwi-cytosol zingathinta kanjani impilo, okusisiza sithole izixazululo ezintsha zezinselelo ezahlukahlukene zezokwelapha. Ezweni lokwazisa okwandayo ngemininingwane emincane kakhulu yezinto eziphilayo, i-cytosol imelela ngempela njengenye yezinto "ezingabonakali" kodwa ezibalulekile ku-biology yamaseli.
