Titre
Sites of nucleic acid binding in type I-IV intermediate filament subunit proteins.
Type
article
Institution
Externe
Périodique
Auteur(s)
Wang, Q.
Auteure/Auteur
Tolstonog, G.V.
Auteure/Auteur
Shoeman, R.
Auteure/Auteur
Traub, P.
Auteure/Auteur
Liens vers les personnes
ISSN
0006-2960
Statut éditorial
Publié
Date de publication
2001-08-28
Volume
40
Numéro
34
Première page
10342
Dernière page/numéro d’article
10349
Peer-reviewed
Oui
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Publication Status: ppublish
Résumé
A combination of enzymatic and chemical ladder sequencing of photo-cross-linked protein-single-stranded oligodeoxyribonucleotide complexes and analysis by MALDI-TOF mass spectrometry was employed to identify the amino acid residues responsible for the stable binding of nucleic acids in several intermediate filament (IF) subunit proteins. The IF proteins studied included the type I and type II cytokeratins K8, K18, and K19; the type III proteins desmin, glial fibrillary acidic protein (GFAP), peripherin, and vimentin; and the type IV neurofilament triplet protein L (NF-L). The site of nucleic acid binding was localized to the non-alpha-helical, amino-terminal head domain of all of the IF proteins tested. GFAP, which has the shortest head domain of the proteins tested, cross-linked via only two amino acid residues. One of these residues was located within a conserved nonapeptide domain that has been shown to be required for filament formation. One or more cross-linked residues were found in a similar location in the other proteins studied. The major binding site for nucleic acids for most of the proteins appears to be localized within the middle of the head domain. The two exceptions to this generalization are GFAP, which lacks these residues, and NF-L, in which a large number of cross-linked residues were found scattered throughout the first half of the head domain. Control experiments were also done with two bacteriophage ssDNA-binding proteins, as well as actin and tubulin. The single sites of cross-linkage observed with the bacteriophage proteins, Phe(183) for the T4 gene 32 protein and Phe(73) for the M13 gene 5 protein, were in good agreement with literature data. Actin and tubulin could not be cross-linked to the oligonucleotide. Aside from the insight into the biological activity of IF proteins that these data provide, they also demonstrate that this analytical method can be employed to study a variety of protein-nucleic acid interactions.
Sujets
PID Serval
serval:BIB_213239066C16
PMID
Date de création
2017-12-15T15:24:57.850Z
Date de création dans IRIS
2025-05-20T17:19:00Z