3ai4 | pdb_00003ai4
Crystal structure of yeast enhanced green fluorescent protein - mouse polymerase iota ubiquitin binding motif fusion protein
Structural highlights
FunctionPOLI_MOUSE Error-prone DNA polymerase specifically involved in DNA repair. Plays an important role in translesion synthesis, where the normal high-fidelity DNA polymerases cannot proceed and DNA synthesis stalls. Favors Hoogsteen base-pairing in the active site. Inserts the correct base with high-fidelity opposite an adenosine template. Exhibits low fidelity and efficiency opposite a thymidine template, where it will preferentially insert guanosine. May play a role in hypermutation of immunogobulin genes. Forms a Schiff base with 5'-deoxyribose phosphate at abasic sites, but may not have lyase activity (By similarity).[1] GFP_AEQVI Energy-transfer acceptor. Its role is to transduce the blue chemiluminescence of the protein aequorin into green fluorescent light by energy transfer. Fluoresces in vivo upon receiving energy from the Ca(2+)-activated photoprotein aequorin. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe generation of crystal lattice contacts by proteinaceous tags fused to target proteins is an attractive approach to aid in the crystallization of otherwise intractable proteins. Here, the use of green fluorescent protein (GFP) fusions for this purpose is demonstrated, using ubiquitin and the ubiquitin-binding motif (UBM) of Y-family polymerase iota as examples. The structure of the GFP-ubiquitin fusion protein revealed that the crystal lattice was formed by GFP moieties. Ubiquitin was accommodated in the lattice through interactions with the peripheral loops of GFP. However, in the GFP-UBM fusion crystal UBM formed extensive interactions with GFP and these interactions, together with UBM dimerization, mediated the crystal packing. Interestingly, the tyrosine residues that are involved in mediating crystal contacts in both GFP-ubiquitin and GFP-UBM crystals are arranged in a belt on the surface of the beta-barrel structure of GFP. Therefore, it is likely that GFP can assist in the crystallization of small proteins and of protein domains in general. Crystallization of small proteins assisted by green fluorescent protein.,Suzuki N, Hiraki M, Yamada Y, Matsugaki N, Igarashi N, Kato R, Dikic I, Drew D, Iwata S, Wakatsuki S, Kawasaki M Acta Crystallogr D Biol Crystallogr. 2010 Oct;66(Pt 10):1059-66. Epub 2010, Sep 18. PMID:20944239[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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