作者: G.E. Turner , K.A. Borkovich
DOI: 10.1016/S0021-9258(18)82405-X
关键词: G12/G13 alpha subunits 、 Heterotrimeric G protein 、 Biochemistry 、 Neurospora crassa 、 G protein 、 Consensus sequence 、 G alpha subunit 、 Genetics 、 Neurospora 、 Biology 、 Protein subunit
摘要: Heterotrimeric G proteins, consisting of alpha, beta, and gamma subunits, are implicated in major signal transduction pathways controlling a diversity functions eukaryotic organisms. In the filamentous fungus Neurospora crassa, proteins regulation several environmental responses. As first step studying role these processes, we have cloned genes for two alpha gna-1 gna-2, from Neurospora. The located on different chromosomes differentially regulated during asexual development. encoded (Gna-1 Gna-2) same size as members Gi-alpha family (approximately 40 kDa). Gna-1 protein sequence is 55% identical overall to Gi contains consensus sequences ADP-ribosylation by pertussis toxin incorporation myristic acid, which found this group. These properties make identified microbial subunit be member any class. Furthermore, incubation N. crassa plasma membrane fraction with results substrate approximate Gna-1. predicted Gna-2 does not share high degree identity However, coding region at least one intron position conserved family. We propose that subunits ancient evolution may appeared fungi.