Hom ntawm cov nqaijrog, zog thiab cov qauv

Raws li cov kev tshawb xav ntawm Oparin-Haldane lub neej nyob rau lub ntiaj teb no twb yug los ntawm cov coacervate mob. Nws kuj yog ib tug protein molecule. Hais tias yog, nws muaj peev xwm yuav xaus lus tias cov tshuaj - lub hauv paus ntawm tag nrho lub neej uas tau tshwm sim niaj hnub no. Tab sis li cas yog ib tug sawv cev rau cov protein ntau lug? Yuav ua li cas lub luag hauj lwm lawv ua si nyob rau hauv lub cev thiab lub neej ntawm tib neeg? Yuav ua li cas hom ntawm cov nqaijrog nyob? Sim kom to taub.

Cov nqaijrog: dav tswvyim

Los ntawm qhov seem yus pom ntawm tshuaj qauv, molecule ntawm lub substance nyob rau hauv lo lus nug yog ib theem ntawm cov amino acids txuas ua ke los ntawm peptide bonds.

Txhua amino acid muaj ob tug functional pawg:

• carboxyl-COOH;
• ib tug amino pab pawg neeg -NH _2.

Nws therebetween thiab yog tsim nyob rau hauv kev twb kev txuas ntawm txawv molecules. Yog li lub peptide daim ntawv cog lus muaj rau hauv daim -CO-NH. protein molecule tej zaum yuav muaj pua pua los yog txhiab tus xws tej pawg neeg, nws yuav yog nyob ntawm seb cov tshuaj yeeb dej caw. Hom ntawm cov nqaijrog yog heev ntau haiv neeg. Ntawm lawv yog cov neeg uas muaj qhov tseem ceeb cov amino acids rau lub cev, thiab yog li ntawd yuav tsum tau noj cov zaub mov. Muaj ib co hom uas muaj ib qho tseem ceeb functions nyob rau hauv lub cell daim nyias nyias thiab nws cytoplasm. Catalysts kuj tsim lom xwm - enzymes, uas yog tseem protein molecules. Lawv yog lug siv nyob rau hauv tib neeg lub neej, thiab tsis yog muab kev koom tes nyob rau hauv lub biochemical kev ntawm nyob beings.

Lub molecular ceeb thawj ntawm lub tebchaw nyob rau hauv lo lus nug tej zaum yuav los ntawm ib tug ob peb kaum lab. Vim hais tias cov xov tooj ntawm monomer units nyob rau hauv lub polypeptide saw infinitely loj thiab nyob ntawm seb yam ntawm cov kev substance. Lub protein nyob rau hauv nws cov ntshiab daim ntawv no, nyob rau hauv nws cov haiv neeg conformation, yuav pom thaum twg yog xav lub qe nyob rau hauv nws cov nqaij nyoos daim ntawv. Lub teeb daj pob tshab tuab colloidal loj, uas yog nyob rau hauv lub nkaub - nws yog ib lub yam tshuaj. Tib yam yog hais tias hais txog qhov uas tsis yog-roj tsev cheese, cov khoom no yog kuj yuav luag ntshiab protein nyob rau hauv nws daim ntawv uas ntuj.

Txawm li cas los, tsis yog txhua txhua ntawm cov kev kawm sib txuas muaj tib lub spatial qauv. Nyob rau hauv tag nrho muaj cov plaub koom haum molecule. Hom ntawm protein lug txiav txim los ntawm nws lub zog thiab tham txog yam ntxwv complexity. Peb kuj paub tias ntau spatially intricate molecules yauv tsis yooj yim ua nyob rau hauv tib neeg thiab tsiaj.

Hom ntawm protein lug

Nyob rau hauv tag nrho muaj cov plaub. Xav txog li cas yuav muab txhua yam ntawm lawv.

1. Primary. Nws yog ib tug pa linear ib theem zuj zus ntawm cov amino acids txuas los ntawm peptide bonds. Tsis spatial twists, tsis muaj helix. Tus nab npawb ntawm inbound mus rau lub polypeptide tej zaum yuav mus txog ob peb txhiab. Hom ntawm cov nqaijrog nrog uas zoo sib xws qauv - glitsilalanin, insulin, histone, elastin, thiab lwm tus neeg.
2. Secondary. Nws comprises ob polypeptide chains uas yog cov helically thiab taw qhia kom paub mus rau txhua lwm yam lem tsim. Yog li nruab nrab ntawm lawv tshwm sim hydrogen bonds tuav lawv ua ke. Yog li yog tsim muaj ib zaug xwb protein molecule. Cov ntaub ntawv ntawm no hom li nram qab no cov nqaijrog: lysozyme, pepsin thiab lwm tus neeg.
3. Tertiary conformation. Yog ib tug densely packed compactly sau nyob rau hauv lub kauj theem nrab qauv. Ntawm no, muaj lwm yam kev sis raug zoo, nyob rau hauv tas li ntawd mus hydrogen bonds - qhov no yog qhov van ua dawb Waals sis thiab lub electrostatic attraction rog, hydrophilic-hydrophobic hu. Piv txwv ntawm cov lug - albumin, fibroin txhob lo lo ntxhuav protein thiab lwm yam.
4. Quaternary. Qhov tseem complex qauv, uas yog ib tug ntau polypeptide chains cov mus rau hauv ib tug kauv, dov rau hauv ib lub pob thiab ua ke ua ke nyob rau hauv ib tug globule. Piv txwv xws li insulin, ferritin, hemoglobin, collagen, piv txwv li no xwb xws li ib conformation ntawm cov proteins.

Yog hais tias peb xav txog tag nrho cov ntsiab lus ntawm cov molecular qauv los ntawm ib tug tshuaj pom, tus tsom xam yuav siv sij hawm ib tug ntev lub sij hawm. Tom qab tag nrho cov, nyob rau hauv qhov tseeb, ntau dua qhov lub configuration, qhov ntau tsis yooj yim thiab ruam tag nws cov qauv, qhov ntau hom ntawm kev sib tshuam cai nyob rau hauv lub molecule.

Denaturation ntawm protein molecules

Ib tug ntawm cov tseem ceeb tshaj plaws tshuaj thaj chaw ntawm lub polypeptides yog lawv muaj peev xwm mus ua txhaum down nyob rau hauv tus ntawm tej yam tej yam kev mob los yog tshuaj cov neeg ua hauj. Piv txwv li, coob leej ntau tus sib txawv hom ntawm cov protein denaturation. Yuav ua li cas yog tus txheej txheem no? Nws yog txoj kev puas tsuaj ntawm cov haiv neeg cov protein. Uas yog, yog hais tias tus thawj molecule muaj ib tug tertiary qauv, tom qab qhov kev txiav txim ntawm tshwj xeeb cov neeg ua hauj nws yuav raug rhuav tshem. Txawm li cas los, ib theem zuj zus ntawm cov amino acid residues nyob rau hauv lub molecule tseem lawm. Denatured proteins uas sai sai poob lawv lub cev thiab tshuaj zog.

Yuav ua li cas cov neeg ua hauj yuav ua rau tus txheej txheem ntawm kev puas tsuaj ntawm conformation? Muaj ntau ntau.

1. Kub. Thaum cua kub, ib tug gradual degradation ntawm lub quaternary, tertiary, theem nrab qauv ntawm cov qauv. Dig muag, nws yog tau mus soj ntsuam, piv txwv li, ib tug pa kib ib lub qe. Cov uas ua "protein" - ib tug thawj qauv ntawm albumin polypeptide, uas tau nyob rau hauv lub crude khoom.
2. Tawg.
3. Qhov kev txiav txim ntawm muaj zog tshuaj cov neeg ua hauj: acids, alkalis, ntsev, heavy co, kuab tshuaj (e.g., alcohols, ethers, benzene, thiab lwm tus).

Qhov no tus txheej txheem no tej zaum hu ua fusion molecule. Hom denaturation ntawm cov nqaijrog nyob ntawm seb tus neeg saib xyuas, qhov kev txiav txim ntawm cov uas nws tshwm sim. Nyob rau tib lub sij hawm, nyob rau hauv tej rooj plaub muaj ib tug rov qab txheej txheem ntawm kev saib xyuas. Qhov no renaturation. Tsis yog txhua txhua cov nqaijrog tau los rov qab mus rau nws cov qauv, tab sis ntau npaum li cas ntawm nws muaj peev xwm ua. Yog li ntawd, chemists los ntawm teb chaws Australia thiab lub tebchaws United States tau DVR qhov renaturation ntawm boiled nqaij qaib qe nrog rau cov kev pab los ntawm ib co ntawm cov reagents thiab cov qauv ntawm cov centrifugation.

Qhov no tus txheej txheem yog ib qho tseem ceeb rau muaj sia nyob rau hauv lub synthesis ntawm polypeptide chains rRNA thiab ribosomes nyob rau hauv lub hlwb.

Hydrolysis ntawm cov protein molecule

Par nrog lub denaturation ntawm cov nqaijrog cov yam ntxwv ntawm lwm cov tshuaj vaj tse - hydrolysis. Qhov no kuj yog kev puas tsuaj ntawm cov haiv neeg conformation, tab sis tsis mus rau lub thawj qauv, thiab yog kiag li mus txog rau lub ib tug neeg amino acids. Ib feem tseem ceeb ntawm kev zom - lub hydrolysis ntawm cov protein. Hom hydrolysis nram qab no polypeptides.

1. Tshuaj. Raws li qhov kev txiav txim ntawm acids los yog alkalis.
2. Lom los yog enzymatic.

Txawm li cas los, lub essence ntawm tus txheej txheem tseem unchanged thiab tsis yog nyob rau hom uas muaj protein ntau hydrolysis yog noj qhov chaw. Raws li ib tug tshwm sim ntawm cov amino acid yog tsim, uas yog thauj los ntawm tag nrho cov hlwb, nruab nrog cev thiab cov nqaij. Lawv ntxiv transformation yuav kev koom tes los ntawm cov synthesis ntawm tshiab polypeptides, muaj cov neeg yuav tsum tau kev kab mob.

Nyob rau hauv kev lag luam, cov protein molecules hydrolysis txheej txheem yog siv raws li ib lub sij hawm rau muab qhov kev kawm amino acids.

Cov nuj nqi ntawm cov nqaijrog nyob rau hauv lub cev

Ntau hom ntawm cov nqaijrog, carbohydrates, Sibhawm yog qhov tseem ceeb Cheebtsam rau lub qub neej ntawm tej cell. Thiab qhov no txhais tau tias tag nrho cov kab mob. Yog li ntawd, nyob rau hauv ntau lub respects lawv lub luag hauj lwm yog piav qhia los ntawm tus high degree ntawm tseem ceeb thiab ubiquity hauv nyob beings. Muaj ntau ntau yooj yim zog ntawm lub polypeptide molecules.

1. Catalytic. Nws yog nqa tawm enzymes uas muaj ib tug muaj protein ntau qhov xwm ntawm tus qauv. Hais txog lawv hais tias tom qab.
2. Qauv. Hom ntawm cov nqaijrog thiab lawv cov functions nyob rau hauv lub cev feem ntau cuam tshuam rau cov qauv ntawm cov cell nws tus kheej, nws daim ntawv. Nyob rau hauv tas li ntawd, lub polypeptides nyob rau hauv no luag hauj lwm, tsim cov plaub hau, rau tes, zoo li ntawm mollusks, noog plaub. Lawv yog tej yam li qub nyob rau hauv lub cell lub cev. Pob txha mos kuj muaj xws li cov ntawm proteins. Piv txwv: tubulin, keratin, actin, thiab lwm tus neeg.
3. Ntxawg. Qhov no feature nws ua nws tus kheej nyob rau hauv kev koom tes los ntawm polypeptides nyob rau hauv dab xws li transcription, translation, cell voj voog, splicing, mRNA thiab lwm yam kev nyeem ntawv. Lawv tag nrho cov ua si ib qho tseem ceeb luag hauj lwm ntawm regulator.
4. Teeb liab. Qhov no muaj nuj nqi yog ua los ntawm cov nqaijrog nyob rau hauv lub cell daim nyias nyias. Lawv kis txawv Pib ntsais koj teeb los ntawm ib tug lub tsev mus rau lwm lub, thiab qhov no ua rau yus mus rau ib tug ncej cov ntaub so ntswg ua ke. Piv txwv: cytokines, insulin, kev loj hlob yam tseem ceeb, thiab lwm tus neeg.
5. Tsheb thauj mus los. Ib txhia hom ntawm cov nqaijrog thiab lawv cov functions hais tias lawv ua tau, tsuas tseem ceeb heev. Qhov no tshwm sim, piv txwv li, lub protein hemoglobin. Nws xa cov pa oxygen thauj los ntawm cell rau ntawm tes nyob rau hauv cov ntshav. nws yog indispensable rau tib neeg beings.
6. Hloov los yog thaub qab. Tej polypeptides noog nyob rau hauv cov nroj tsuag thiab cov tsiaj raws li ib qhov chaw ntawm oocytes ntxiv hwj chim thiab lub zog. Piv txwv li - globulins.
7. Tsav. Ib tug heev ib qho tseem ceeb feature, tshwj xeeb tshaj yog rau protozoa thiab cov kab mob. Tom qab tag nrho, lawv yuav tau tsiv mus nyob nrog cov kev pab los ntawm flagella los yog cilia. Thiab cov organelles yog inherently tsis muaj dab tsi zoo li proteins. Piv txwv li polypeptides yog raws li nram no: myosin, actin, kinesin, thiab lwm tus neeg.

Nws yog pom tseeb tias cov kev ua ntawm cov nqaijrog nyob rau hauv tib neeg lub cev thiab lwm yam nyob beings yog heev heev heev thiab tseem ceeb heev. Qhov no qhia ib zaug dua hais tias tsis muaj kev sib txuas yuav tsis muab suav hais tias los ntawm peb, lub neej nyob rau lub ntiaj teb no.

Cov kev tiv thaiv nuj nqi ntawm cov nqaijrog

Polypeptides yuav tiv thaiv txawv influences: tshuaj, lub cev thiab lom. Piv txwv li, yog hais tias tus lub cev yuav tsum raug teeb meem raws li ib tug kab mob los yog kab mob nrog rau txawv teb chaws xwm, cov immunoglobulins (antibodies) tuaj mus rau lawv "nyob rau hauv qhov kev sib ntaus", ua ib tug tiv thaiv luag hauj lwm.

Yog hais tias peb tham txog lub cev los, muaj yog ib tug loj luag hauj lwm ua si, piv txwv li, fibrin thiab fibrinogen, uas yog muab kev koom tes nyob rau hauv cov ntshav txhaws.

khoom noj khoom haus cov nqaijrog

Hom ntawm kev noj haus protein yog raws li nram no:

• tag nrho - cov neeg uas muaj tag nrho cov tseem ceeb cov amino acids;
• puas - cov nyob rau hauv uas yog ib tug ib nrab amino acid muaj pes tsawg leeg.

Txawm li cas los, rau tib neeg lub cev yog ib qho tseem ceeb thiab cov neeg thiab lwm tus. Tshwj xeeb tshaj yog thawj pab pawg neeg. Txhua leej txhua tus, tshwj xeeb tshaj yog thaum lub sij hawm lub sij hawm ntawm txoj kev loj hlob mob siab heev (tseem yog menyuam yaus thiab hluas) thiab tiav nkauj tiav nraug yuav tsum muaj ib tug qhov theem ntawm cov protein nyob rau hauv nws tus kheej. Tom qab tag nrho, peb twb tau them zog uas ua tau cov no amazing molecules, thiab peb paub hais tias yuav luag tsis muaj cov txheej txheem, tsis muaj biochemical cov tshuaj tiv thaiv tsis pub dhau peb yuav tsis ua yam uas tsis muaj kev koom tes ntawm cov polypeptides.

Yog vim li cas koj xav tau txhua txhua hnub kom lub hnub yuav tsum tau ntawm cov protein, uas yog muaj nyob rau hauv cov nram no cov khoom:

• qe;
• mis nyuj;
• tsev cheese;
• nqaij thiab cov ntses;
• taum;
• taum pauv;
• taum;
• txiv laum huab xeeb;
• nplej;
• oats;
• lentils thiab lwm yam.

Yog hais tias koj haus txhua hnub 0.6 g polypeptide ib kg ntawm lub cev hnyav, ces tus neeg yuav tsis muaj ib tug tsis txaus ntawm cov tebchaw. Yog hais tias ib tug ntev lub sij hawm lub cev tsis tau txais cov kev cov nqaijrog, tus kab mob no tshwm sim, ib tug npe hu amino acid starvation. Qhov no ua rau yus mus rau mob hnyav metabolic mob thiab raws li ib tug tshwm sim, ntau lwm ailments.

Cov nqaijrog nyob rau hauv lub cell

Sab hauv, qhov tsawg tshaj plaws yam ntxwv chav tsev ntawm tag nrho cov nyob yam - hlwb - yog tseem proteins. Thiab lawv ua yuav luag tag nrho cov saum toj no kom muaj nuj nqi. Feem ntau txoj kev hlwb cytoskeleton muaj microtubules, microfilaments. Nws ua hauj lwm pab kom muaj cov zoo lawm, raws li tau zoo raws li kev thauj ntawm organelles hauv. Rau protein molecules, ob qho tib si raws los yog ntsia, txav ntau yam ions, tebchaw.

Qhov tseem ceeb luag hauj lwm ntawm cov nqaijrog kos nyob rau hauv daim nyias nyias thiab nyob rau nws saum npoo. Ntawm no lawv muaj, thiab receptor thiab taw zog yog nqa tawm, yog noj ib feem nyob rau hauv kev tsim kho ntawm daim nyias nyias tus kheej. Sawv khwb, thiab yog li ua si ib tug tiv luag hauj lwm. Yuav ua li cas hom ntawm cov nqaijrog nyob rau hauv lub cell yuav tsum tau ntaus nqi rau qhov no pab pawg neeg? Muaj ntau cov piv txwv, peb yuav muab ob peb tug.

1. Actin thiab myosin.
2. Elastin.
3. Keratin.
4. Collagen.
5. Tubulin.
6. Hemoglobin.
7. Insulin.
8. Transcobalamin.
9. Transferrin.
10. Albumin.

Nyob rau hauv tag nrho cov muaj cov pua pua ntawm cov sib txawv hom ntawm cov nqaijrog, uas yog lossi tsiv hauv txhua ntawm tes.

Hom ntawm cov nqaijrog nyob rau hauv lub cev

Lawv yog cov, ntawm chav kawm, ib tug lossis loj ntau yam. Yog hais tias peb yuav ua tiag ua cas faib tag nrho cov uas twb muaj lawm cov nqaijrog rau hauv pab pawg, nws muaj peev xwm tig ib ncig ntawm xws li ib tug cais.

1. Globular proteins. Nws yog cov neeg sawv cev los ntawm lub tertiary qauv, i.e. densely packed globule. Piv txwv li lug muaj xws li: immunoglobulins, feem ntau ntawm enzymes, ntau cov tshuaj hormones.
2. Fibrillar proteins. Sawv cev nruj me ntsis kom filaments muaj tseeb spatial symmetry. Qhov no pab pawg neeg ntawm cov nqaijrog muaj xws li cov thawj thiab cov qauv. Piv txwv li, keratin, collagen, tropomyosin, fibrinogen.

Feem ntau, koj muaj peev xwm coj raws li ib lub hauv paus rau lub teeb ntawm cwj pwm rau cov kev faib ntawm cov nqaijrog tam sim no nyob rau hauv lub cev. Tib tsis muaj nyob tsis tau.

enzymes

Lom catalysts ntawm protein xwm, uas speeds tag nrho cov tshwm sim biochemical dab. Tej kev pauv ntawm tshuaj tsuas tsis tau tau tsis tau cov tebchaw. Tag nrho cov txheej txheem ntawm synthesis thiab rhuav tshem, lub rooj sib txoos ntawm molecules thiab lawv replication, transcription thiab txhais lus, thiab lwm yam yog nqa tawm nyob rau hauv tus ntawm cov kev hauv daim ntawv ntawm cov enzyme. Piv txwv ntawm cov molecules muaj xws li:

• oxidoreductase;
• transferase;
• catalase;
• hydrolase;
• isomerase;
• lyase thiab lwm tus neeg.

Niaj hnub no, enzymes yog siv nyob rau hauv lub neej txhua hnub. Piv txwv li, nyob rau hauv qhuav ntawm ntxuav hmoov yog feem ntau siv thiaj li hu ua enzymes - hais tias muaj lom catalysts. Lawv txhim kho qhov zoo ntawm ntxuav nyob rau hauv kev cai tswjhwm kub tej yam kev mob. Nws yog ib qho yooj yim mus khi rau av hais thiab tshem tawm lawv los ntawm lub nto ntawm ntaub so ntswg.

Txawm li cas los, vim rau qhov xwm ntawm cov protein ntau enzymes yuav tsis tso ib yam nkaus thiab dej kub los yog sib thooj rau alkaline los yog acidic tshuaj. Tseeb, nyob rau hauv cov ntaub ntawv no, lub denaturation txheej txheem yuav tshwm sim.