دورية أكاديمية
Structural and biochemical properties show ARL3-GDP as a distinct GTP binding protein.
| العنوان: | Structural and biochemical properties show ARL3-GDP as a distinct GTP binding protein. |
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| المؤلفون: | Hillig RC; Max-Planck-Institut für Molekulare Physiologie, Abteilung Strukturelle Biologie, Dortmund, Germany., Hanzal-Bayer M, Linari M, Becker J, Wittinghofer A, Renault L |
| المصدر: | Structure (London, England : 1993) [Structure] 2000 Dec 15; Vol. 8 (12), pp. 1239-45. |
| نوع المنشور: | Journal Article; Research Support, Non-U.S. Gov't |
| اللغة: | English |
| بيانات الدورية: | Publisher: Cell Press Country of Publication: United States NLM ID: 101087697 Publication Model: Print Cited Medium: Print ISSN: 0969-2126 (Print) Linking ISSN: 09692126 NLM ISO Abbreviation: Structure Subsets: MEDLINE |
| أسماء مطبوعة: | Publication: 2000- : Cambridge, Mass. : Cell Press Original Publication: London : Current Biology, c1993- |
| مواضيع طبية MeSH: | ADP-Ribosylation Factors/*chemistry , ADP-Ribosylation Factors/*metabolism , GTP-Binding Proteins/*chemistry , GTP-Binding Proteins/*metabolism , Guanosine Diphosphate/*chemistry , Guanosine Diphosphate/*metabolism, ADP-Ribosylation Factor 1/chemistry ; ADP-Ribosylation Factor 1/classification ; ADP-Ribosylation Factor 1/metabolism ; ADP-Ribosylation Factors/classification ; Amino Acid Sequence ; Animals ; Binding Sites ; Crystallography, X-Ray ; GTP-Binding Proteins/classification ; Magnesium/chemistry ; Mice ; Molecular Sequence Data ; Peptide Fragments/chemistry ; Peptide Fragments/metabolism ; Protein Conformation ; Protein Structure, Secondary ; Sequence Homology, Amino Acid |
| مستخلص: | Background: Based on sequence similarities, Arf-like (ARL) proteins have been assigned to the Arf subfamily of the superfamily of Ras-related GTP binding proteins. They have been identified in several isoforms in a wide variety of species. Their cellular function is unclear, but they are proposed to regulate intracellular transport. Results: The 1.7 A crystal structure of murine ARL3-GDP provides a first insight into the structural features of this subgroup of Ar proteins. The N-terminal extension of ARL3 folds into an elongated loop region that is hydrophobically anchored onto the surface by burying 1440 A2. The features observed suggest that ARL3 releases its N terminus and undergoes a beta sheet register shift upon the binding of GTP. The structure and kinetic experiments with fluorescent mGDP demonstrate that tight GDP (but not GTP) binding is achieved in the absence of a magnesium ion. This is due to a lysine residue in the active site, close to the canonical Mg2+ site found in other GTP binding proteins. This is a distinct feature separating ARL2 and ARL3 from Arf proteins. Conclusion: The disturbed magnesium binding site and the independence of GDP coordination from the presence of Mg2+ separate ARL2 and ARL3 from Arf proteins. The D sheet register shift, which is similar to that of Arf, that is observed in the present structure, along with the postulated release of the N-terminal extension and the concomitant exposure of a patch of conserved hydrophobic residues in this region suggest that ARL proteins might be localized to target membranes upon exchange of GDP to GTP. Contrary to the situation in Arf, however, the conformational change to ARL-GTP does not require the presence of membranes and might thus be energetically unfavored. Together with the very low affinity described for the interaction of ARL3 with Mg-GTP, this suggests that ARL protein activation requires the presence of effectors stabilizing the GTP coordination rather than guanine nucleotide exchange factors (GEFs). |
| سلسلة جزيئية: | PDB 1FZQ |
| المشرفين على المادة: | 0 (Peptide Fragments) 146-91-8 (Guanosine Diphosphate) EC 3.6.1.- (GTP-Binding Proteins) EC 3.6.1.2 (Arl3 protein, mouse) EC 3.6.5.2 (ADP-Ribosylation Factor 1) EC 3.6.5.2 (ADP-Ribosylation Factors) I38ZP9992A (Magnesium) |
| تواريخ الأحداث: | Date Created: 20010224 Date Completed: 20010329 Latest Revision: 20190915 |
| رمز التحديث: | 20221213 |
| DOI: | 10.1016/s0969-2126(00)00531-1 |
| PMID: | 11188688 |
| قاعدة البيانات: | MEDLINE |
Full Text Finder | تدمد: | 0969-2126 |
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| DOI: | 10.1016/s0969-2126(00)00531-1 |