کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10537275 | 962704 | 2013 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
H-bonding networks of the distal residues and water molecules in the active site of Thermobifida fusca hemoglobin
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کلمات کلیدی
Thermobifida fuscaASV2-(N-morpholino)ethanesulfonic acid - 2- (N-مورفولینو) اتان سولفونیک اسیدEPR - تشدید پارامغناطیس الکترونElectron paramagnetic resonance - تشدید پارامغناطیس الکترونMolecular dynamics - دینامیک ملکولی یا پویایی مولکولیResonance Raman - رامان رزونانسCyanide ligand - لیگاند سیانیدMeS - مسMyoglobin - میوگلوبینwild type - نوع وحشیHemoglobin - هموگلوبینTruncated hemoglobin - هموگلوبین مختصرfive-coordinate - پنج مختصاتHydrogen-bond - پیوند هیدروژنیHigh spin - چرخش بالاLow spin - چرخش کم
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The ferric form of truncated hemoglobin II from Thermobifida fusca (Tf-trHb) and its triple mutant WG8F-YB10F-YCD1F at neutral and alkaline pH, and in the presence of CNâ have been characterized by resonance Raman spectroscopy, electron paramagnetic resonance spectroscopy, and molecular dynamics simulations. Tf-trHb contains three polar residues in the distal site, namely TrpG8, TyrCD1 and TyrB10. Whereas TrpG8 can act as a potential hydrogen-bond donor, the tyrosines can act as donors or acceptors. Ligand binding in heme-containing proteins is determined by a number of factors, including the nature and conformation of the distal residues and their capability to stabilize the heme-bound ligand via hydrogen-bonding and electrostatic interactions. Since both the RR Fe-OHâ and Fe-CNâ frequencies are very sensitive to the distal environment, detailed information on structural variations has been obtained. The hydroxyl ligand binds only the WT protein giving rise to two different conformers. In form 1 the anion is stabilized by H-bonds with TrpG8, TyrCD1 and a water molecule, in turn H-bonded to TyrB10. In form 2, H-bonding with TyrCD1 is mediated by a water molecule. Unlike the OHâ ligand, CNâ binds both WT and the triple mutant giving rise to two forms with similar spectroscopic characteristics. The overall results clearly indicate that H-bonding interactions both with distal residues and water molecules are important structural determinants in the active site of Tf-trHb. This article is part of a Special Issue entitled: Oxygen Binding and Sensing Proteins.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics - Volume 1834, Issue 9, September 2013, Pages 1901-1909
Journal: Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics - Volume 1834, Issue 9, September 2013, Pages 1901-1909
نویسندگان
Francesco P. Nicoletti, Enrica Droghetti, Barry D. Howes, Juan P. Bustamante, Alessandra Bonamore, Natascia Sciamanna, DarÃo A. Estrin, Alessandro Feis, Alberto Boffi, Giulietta Smulevich,