Sökning: WFRF:(Åqvist Johan 1959 ) > (2009) > Protein autoproteol...
Fältnamn | Indikatorer | Metadata |
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000 | 05654naa a2200637 4500 | |
001 | oai:gup.ub.gu.se/104202 | |
003 | SwePub | |
008 | 240910s2009 | |||||||||||000 ||eng| | |
009 | oai:slubar.slu.se:27202 | |
009 | oai:DiVA.org:uu-128356 | |
024 | 7 | a https://gup.ub.gu.se/publication/1042022 URI |
024 | 7 | a https://doi.org/10.1021/ja90108172 DOI |
024 | 7 | a https://res.slu.se/id/publ/272022 URI |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1283562 URI |
040 | a (SwePub)gud (SwePub)slud (SwePub)uu | |
041 | a eng | |
042 | 9 SwePub | |
072 | 7 | a ref2 swepub-contenttype |
072 | 7 | a art2 swepub-publicationtype |
100 | 1 | a Johansson, Denny,d 1980u Gothenburg University,Göteborgs universitet,Institutionen för biomedicin, avdelningen för medicinsk kemi och cellbiologi,Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology4 aut0 (Swepub:gu)xjohde |
245 | 1 0 | a Protein autoproteolysis: conformational strain linked to the rate of peptide cleavage by the pH dependence of the N --> O acyl shift reaction. |
264 | c 2009-06-17 | |
264 | 1 | b American Chemical Society (ACS),c 2009 |
520 | a Nucleophilic attack by a side chain nucleophile on the adjacent peptide bond followed by N --> O or N --> S acyl shift is the primary step in protein autoproteolysis. Precursor structures of autoproteolytic proteins reveal strained (or twisted) amides at the site of cleavage, and we previously showed that SEA domain autoproteolysis involves substrate destabilization by approximately 7 kcal/mol. However, the precise chemical mechanism by which conformational energy is converted into reaction rate acceleration has not been understood. Here we show that the pH dependence of autoproteolysis in a slow-cleaving mutant (1G) of the MUC1 SEA domain is consistent with a mechanism in which N --> O acyl shift proceeds after initial protonation of the amide nitrogen. Unstrained amides have pK(a) values of 0 with protonation on the oxygen, and autoproteolysis is therefore immeasurably slow at neutral pH. However, conformational strain forces the peptide nitrogen into a pyramidal conformation with a significantly increased pK(a) for protonation. We find that pK(a) values of approximately 4 and approximately 6, as in model compounds of twisted amides, reproduce the rate of autoproteolysis in the 1G and wild-type SEA domains, respectively. A mechanism involving strain, nitrogen protonation, and N --> O shift is also supported by quantum-chemical calculations. Such a reaction therefore constitutes an alternative to peptide cleavage that is utilized in autoproteolysis, as opposed to a classical mechanism involving a structurally conserved active site with a catalytic triad and an oxyanion hole, which are not present at the SEA domain cleavage site. | |
650 | 7 | a NATURVETENSKAPx Biologix Biokemi och molekylärbiologi0 (SwePub)106022 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Biological Sciencesx Biochemistry and Molecular Biology0 (SwePub)106022 hsv//eng |
650 | 7 | a NATURVETENSKAPx Kemix Fysikalisk kemi0 (SwePub)104022 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Chemical Sciencesx Physical Chemistry0 (SwePub)104022 hsv//eng |
650 | 7 | a MEDICIN OCH HÄLSOVETENSKAPx Medicinska och farmaceutiska grundvetenskaperx Cell- och molekylärbiologi0 (SwePub)301082 hsv//swe |
650 | 7 | a MEDICAL AND HEALTH SCIENCESx Basic Medicinex Cell and Molecular Biology0 (SwePub)301082 hsv//eng |
650 | 7 | a NATURVETENSKAPx Biologi0 (SwePub)1062 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Biological Sciences0 (SwePub)1062 hsv//eng |
653 | a Hydrogen-Ion Concentration | |
653 | a Nitrogen | |
653 | a chemistry | |
653 | a Oxygen | |
653 | a chemistry | |
653 | a Peptides | |
653 | a chemistry | |
653 | a Protein Conformation | |
653 | a Proteins | |
653 | a chemistry | |
653 | a Quantum Theory | |
653 | a Biology | |
700 | 1 | a Wallin, Göranu Uppsala universitet,Institutionen för cell- och molekylärbiologi4 aut |
700 | 1 | a Sandberg, Anders,d 1975u Gothenburg University,Göteborgs universitet,Institutionen för biomedicin, avdelningen för medicinsk kemi och cellbiologi,Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology4 aut |
700 | 1 | a Macao, Bertil,d 1969u Gothenburg University,Göteborgs universitet,Institutionen för biomedicin, avdelningen för medicinsk kemi och cellbiologi,Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology4 aut0 (Swepub:gu)xmacbe |
700 | 1 | a Åqvist, Johanu Uppsala universitet,Institutionen för cell- och molekylärbiologi4 aut0 (Swepub:uu)johanaq |
700 | 1 | a Härd, Torleif,d 1959u Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Gothenburg University,Göteborgs universitet,Institutionen för biomedicin, avdelningen för medicinsk kemi och cellbiologi,Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology,Institutionen för molekylärbiologi,Department of Molecular Biology,University of Gothenburg4 aut0 (Swepub:slu)50056 |
710 | 2 | a Göteborgs universitetb Institutionen för biomedicin, avdelningen för medicinsk kemi och cellbiologi4 org |
710 | 2 | a Sveriges lantbruksuniversitet |
773 | 0 | t Journal of the American Chemical Societyd : American Chemical Society (ACS)g 131:27, s. 9475-7q 131:27<9475-7x 1520-5126x 0002-7863 |
856 | 4 8 | u https://gup.ub.gu.se/publication/104202 |
856 | 4 8 | u https://doi.org/10.1021/ja9010817 |
856 | 4 8 | u https://res.slu.se/id/publ/27202 |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-128356 |
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