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Deletion of amino acid residues 33-46 in growth hormone alters the hydrophobicity of the molecule

机译:生长激素中氨基酸残基33-46的缺失改变了分子的疏水性

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Growth hormone (GH) variants have been??studied??for??the structure-function?relationship??of??the?molecule.?The?presence?of?a?potential?alternate?splicing?point?inmRNA?in?bGH?gene?at?exon?3,?similar?to?hGH?has?been?reported?by?workers.?Earlyinvestigation?on?the?characteristics?of?the?chemistry?of?20k?oGH?showed?that?themolecule?was?produced?by?site-directed?mutagenesis?by?deleting?amino?acid?residues33-46?and?the?resultant?DNA?was expressed?in?E.?coli?under?the?control?of?lac?promoterin?pUC?based?plasmid.?The?mutant?protein?remained?insoluble?and?did?not?refold.?Toinvestigate?the?effect?of?deletion?on?the?chemistry?of?the?molecule,?computationalbiology?tools?were?employed.?The?mutant?with?the?deletion?of?amino?acid?residues?33?46,?was?designed?and?the?model?was?visualized?on?computer.?The?structure?of?20kbGH?was?compared?with?bGH?and?dissected?for?hydrogen?bonds?and?hydro-phobicity.?Computational?biology?tools?were?helpful?in?elucidating?the?role?of?33-46?amino?acidresidues?domain?in?the?chemistry?of?the?molecule.?Furthermore,?it?was?revealed?thatremoval?of?amino?acid?residues?33-?46?which?formed?the?hydrogen?bonds?involving?Glu33,?Gln?46,?Pro?38,?Arg?42,?Tyr?43,Ala?51,?Thr?48,?Asn?47,?led?to?the?formation?of?newhydrogen?bonds?between?Thr?33,?Tyr?144,?Asn?32,?Asn?32?andSer?and?Asp?153.?Theremoval?of?the?amino?acids?33-46?decreased?the?hydro?phobicity?of?the?first?helix?ofbGH?molecule,?ascompared?to?20k?hGH,?thus?altering?the?solubility?of?themolecule,?confirming?the?earlier?reported?results?for?ovine?growth?hormone?with?samedeletion.
机译:已经研究了生长激素(GH)变体的分子结构功能关系。潜在的替代剪接点inmRNA的存在。在第3外显子的bGH基因中,工人报告了与hGH类似的基因。对20k oGH化学性质的早期研究。结果表明,该分子是通过定点诱变,通过删除氨基酸残基33-46而产生的,而所得的DNA则在大肠杆菌中表达。这种基于乳酸菌启动子的pUC基质粒的控制。突变蛋白保持不溶并且没有重新表达。以研究缺失对蛋白的影响。使用分子化学,计算生物学工具。设计了带有氨基酸残基33-46的缺失的突变体并设计了模型。在计算机上进行了可视化。将20kbGH的结构与bGH进行了比较,并针对氢键和疏水性进行了分析。有助于阐明33-46个氨基酸残基在其中的作用进一步地,揭示了除去了氨基酸残基33-46的残基,该残基形成了与Glu33有关的氢键。 Gln 46,Pro 38,Arg 42,Tyr 43,Ala 51,Thr 48,Asn 47导致在它们之间形成新的氢键。 Thr 33,Tyr 144,Asn 32,Asn 32和Ser和Asp153。氨基酸33-46的去除降低了疏水性。相比之下,bGH分子的第一个“螺旋”的分子量为20k hGH,因此改变了该分子的可溶性,确认了先前报告的羊生长的结果。 “荷尔蒙”和“ samedeletion”。

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