Site na ozi Peptide 
Eprel 21, 2025
Edemede na ozi ngwaahịa niile enyere na webụsaịtị a bụ naanị maka mgbasa ozi na ebumnuche mmụta.
Ngwaahịa ndị enyere na webụsaịtị a bụ naanị maka nyocha in vitro. A na-eme nyocha in vitro (Latin: * na iko *, nke pụtara na ihe eji enyo) na mpụga ahụ mmadụ. Ngwaahịa ndị a abụghị ọgwụ, ndị US Food and Drug Administration (FDA) akwadoghị ya, ha agaghịkwa eji ya gbochie, gwọọ, ma ọ bụ gwọọ ọnọdụ ahụike ọ bụla, ọrịa, ma ọ bụ ọrịa. Iwu amachibidoro nke ọma iwebata ngwaahịa ndị a n'ime ahụ mmadụ ma ọ bụ anụmanụ n'ụdị ọ bụla.
Amino acids bụ ogige organic nwere otu α-amino (α-NH₂) na otu α-carboxyl (α-COOH), nwere usoro izugbe RCH (NH₂) COOH. Atọm α-carbon jikọtara ya na otu akụkụ-agbụ a kapịrị ọnụ (R Group), na-eme usoro nhazi ntọala nke macromolecules dị ndụ. Enwere amino acid 20 sitere n'okike na-etinye aka na njikọ protein na okike, nke na-enweta ọdịiche dị n'ọrụ site na ọdịiche dị na njirimara kemịkalụ nke ụdọ akụkụ ha (polarity, charge, hydrophobicity). Peptides bụ polymers linear nke amino asịd abụọ ma ọ bụ karịa jikọtara site na amide bonds (-CO-NH-) site na mmiri mmiri na-ekpo ọkụ, na-anọchi anya ngwaahịa oligomeric ma ọ bụ polymeric nke amino acids. Ekewapụtara site na ọnụọgụ amino acid residues, a na-ekewa ha na oligopeptides (2-10 residues) na polypeptides (ihe karịrị 10 residues), nwere ihe dị arọ nke molekụla sitere na 0.2 ruo 10 kDa. Ha na-eje ozi dị ka nkeji ọrụ etiti na mgbanwe site na amino acid monomers gaa na protein macromolecules.
Mmekọrịta na isi ọdịiche dị n'etiti Peptides na Amino Acids
Amino acids bụ ihe mmalite nhazi na ihe mgbochi ụlọ nke peptides, nke bụ oligomer na-arụ ọrụ nke etolite site na njikọ njikọ amino acid site na njikọ amide. Abụọ ndị a na-egosipụta nnukwu ọdịiche dị na akụkụ molekụla, usoro nhazi, na njirimara arụ ọrụ:
Ngwakọta molekụla:
Amino acids bụ ụmụ irighiri ihe monomeric nọọrọ onwe ya (oke nha 75-204 Da), nwere amino na otu carboxyl n'efu yana agbụ akụkụ. Peptides bụ nchịkọta nke ọtụtụ amino acids, ebe a na-ekpochapụ steeti amino na carboxyl n'efu site na njikọ amide iji mepụta ọkpụkpụ peptide bond na-aga n'ihu (-NH-CO-).
Mgbagwoju anya Ọdịdị:
Amino acids nwere naanị usoro izizi (nhazi kemịkalụ), ebe peptides nwere usoro ahịrị (usoro izizi) na ike imepụta plastik. Peptides dị mkpụmkpụ dị dị ka agbụ na-agbanwe agbanwe, na ogologo peptides nwere ike ịmepụta ụlọ nke abụọ nke mpaghara (dị ka mkpirisi α-helix ma ọ bụ β-atụgharị), n'agbanyeghị na ha enweghị ihe owuwu nwere akụkụ atọ kwụsiri ike.
Ọchịchị Na-arụ Ọrụ:
Amino acid na-arụ ọrụ dịka akụrụngwa maka biosynthesis na etiti metabolic. Otú ọ dị, peptides nwere ike ịrụ ọrụ dị ndụ ozugbo, na-eme ya dabere na usoro amino acid dị iche iche na mgbanwe dị ike.
Amino Acids: Foundation Molecular nke Peptides
A na-ekewa amino acid eke eke mejupụtara peptides n'ime ụzọ ise dabere na njirimara kemịkalụ nke ụdọ akụkụ ha:
Amino Acids Aliphatic Nonpolar: Agbụ akụkụ hydrophobic dị ukwuu na-emekọrịta mmekọrịta intrachain hydrophobic, na-emetụta ọchịchọ mpịachi peptide.
Amino Acids Polar anaghị akwụ ụgwọ: Agbụ akụkụ nwere otu polar dị ka otu hydroxyl, na-ekere òkè na nhazi njikọ hydrogen na mgbanwe ntụgharị ntụgharị (dịka ọmụmaatụ, phosphorylation).
Amino acid na-esi ísì ụtọ: ụdọ akụkụ nwere ihe mgbanaka jikọtara ọnụ na-enye peptides nwere njirimara absorption nke ultraviolet (nke dị nso 280 nm) yana ikike ịmata mkpụrụ ndụ.
Amino acid acid (aspartic acid, glutamic acid) na Basic Amino Acids (lysine, arginine): Agbụ n'akụkụ nwere ndị na-ekewapụ, na-ekpebi nkesa ụgwọ, ebe isoelectric, na mmiri solubility nke peptides.
A na-etinye Amino acid n'ime ribosome site na usoro ntụgharị asụsụ ribosomal, na-eji mRNA codons dị ka ndebiri ma na-ebu aminoacyl-tRNA. A na-ejikọta ha n'usoro site na nhazi peptide bond, yana ozi usoro ha kwadoro nke ọma site na ntinye mkpụrụ ndụ ihe nketa, na-eje ozi dị ka ihe ndabere molekụla maka ịrụ ọrụ peptide.
Atụmatụ nhazi yana Mgbasawanye arụmọrụ nke Peptides
Nhazi nke peptides gụnyere otu amino N-terminal, otu carboxyl C-terminal, yana ọkpụkpụ azụ amide na-emegharị ugboro ugboro. Njirimara molekụla ha na-agbanwe site na mmụba nke ọnụọgụ amino acid:
Oligopeptides (2-10 residues): Ọ na-adịkarị dị ka nhazi ahịrị na-agbanwe agbanwe. Dịka ọmụmaatụ, dipeptide carnosine (β-alanyl-L-histidine) na-ekere òkè na mmemme antioxidant na anụ ahụ, na pentapeptide enkephalin na-arụ ọrụ dị ka ihe opioid endogenous na-achịkwa mmetụta mgbu.
Polypeptides (ihe fọrọ nke nta ka ọ bụrụ 10): Nwere ike ịmepụta ihe owuwu obodo nyere iwu. Dịka ọmụmaatụ, hormone na-ahapụ thyrotropin (trieptide, pGlu-His-Pro-NH₂) na-eme ka nkwụsi ike site na mgbanwe mgbanwe nke cyclization, na peptides antimicrobial na-arụ ọrụ nje site n'itinye amphiphilic α-helices n'ime akpụkpọ anụ nje bacteria.
Uru arụ ọrụ nke peptides sitere na ha 'nha molekụla na-agafeghị oke' - na-ejigide mmeghachi omume kemịkalụ nke ụdọ akụkụ amino acid ka ha na-enweta ntugharị mgbaama na-ejikọta ebumnuche, yana usoro metabolic site na mmekọrịta nkwado dị iche iche.
Ụzọ dị iche iche nke Biosynthesis na Chemical Synthesis
A na-ahazi biosynthesis nke amino acid nke ọma site na ụzọ metabolic cellular; Dịka ọmụmaatụ, a na-emepụta glutamate site na ntinye nke α-ketoglutarate, nke etiti nke tricarboxylic acid okirikiri. Peptide biosynthesis na-adabere na ribosomal ma ọ bụ usoro njikọ na-abụghị nke:
-Ribosomal Synthesis: mRNA na-ebu ozi mkpụrụ ndụ ihe nketa n'ime ribosome, ebe tRNA dakọtara codons ma buru amino acid. A na-etolite agbụ peptide site na steepụ nke njikọ aminoacyl-tRNA, nhazi njikọ peptide, na ntụgharị, dabara adaba maka imepụta peptides eke na protin precursors.
Synthesis nonribosomal: A na-ahụkarị na metabolites nke abụọ microbial, amino acid na-agbakọta ozugbo site na ogige multi-enzyme, na-enye ohere itinye amino acid na-abụghị eke.
Usoro njikọ kemịkalụ na-enweta njikọ nke amino acid site na usoro nchebe otu, dabara adaba maka nkwadebe nke peptides dị mkpụmkpụ (50 residues). Ụzọ ndị a na-enye uru dị ka usoro nchịkwa na ịdị ọcha dị elu, nke a na-etinye n'ọtụtụ ebe na mmepe nke ọgwụ polypeptide.
Usoro mmekọrịta nke agbụ akụkụ na ọrụ Peptide
Mmekọrịta imekọ ihe ọnụ nke agbụ akụkụ amino acid dị n'agbụ peptide dị oke mkpa maka ịghọta ọrụ:
Nkwanye ụgwọ: Acid na amino acid nke bụ isi na-eme ka nhazi peptide dị na mpaghara kwụsie ike site na njikọ ionic.
Mkpokọta Hydrophobic: Agbụ akụkụ amino acid na-abụghị polar na-etolite cores hydrophobic na ngwọta mmiri mmiri, na-ebugharị ụdọ peptide ka ọ na-agbakọta n'ime ụdị dị iche iche.
Mgbanwe nke Covalent: Serine na threonine na agbụ peptide nwere ike ịbụ phosphorylated, na asparagine nwere ike ịbụ glycosylated. Mgbanwe ndị a na-agbanwe nke ukwuu peptide hydrophobicity, ụgwọ steeti, na ihe omume ndu.
Ọdịiche dị n'agbụ akụkụ na-enyere ndị peptides aka ilekwasị anya kpọmkwem biomolecules site na nhazi usoro, na-eme ka ha bụrụ ezigbo ngwaọrụ maka mmepe ọgwụ maka iṅomi njikọ eke ma ọ bụ igbochi mmekọrịta protein-protein.
Nkọwa okwu na ụkpụrụ nkwupụta sayensị
N'ọnọdụ agụmakwụkwọ, ọdịiche dị n'etiti 'amino acids' na 'peptides' na-agbaso ụkpụrụ ndị a:
Monomers vs. Polymers: A na-akpọ mkpụrụ ndụ α-amino carboxylic acid nke kwụụrụ onwe ya 'amino acid,' n'agbanyeghị steeti ha nwere n'efu ma ọ bụ nke nwere oke.
Njikọ njikọ Amide: Ngwaahịa nke amino acid abụọ ma ọ bụ karịa jikọtara site na njikọ amide ka a na-akpọ 'peptides,' na-emesi ọdịdị oligomeric ha ike.
Njikọ na-arụ ọrụ: Mgbe a na-ekwu maka ụdị amino acid dị n'agbụ peptide, a na-eji okwu a bụ 'amino acid residue' mara ọdịiche na njirimara kemịkalụ nke amino asịd efu.
Iji nkọwa okwu ziri ezi na-enyere aka kọwapụta ọkwa nke molikula nke ọma ma na-ezere mgbagwoju anya n'etiti 'amino acid' na 'peptides' n'ihe gbasara ogo polymerization na njirimara arụ ọrụ.
