S. Tascou et al., Isolation and characterization of a novel human gene, NIF3L1,and its mouseortholog, Nif3/1, highly conserved from bacteria to mammals, CYTOG C GEN, 90(3-4), 2000, pp. 330-336
We report the cloning and characterization of novel human and murine genes
NIF3L1 and Nif3l1 which are strongly homologous to the yeast Ngg1-interacti
ng factor 3 homolog. Mouse Nif3l1 and human NIF3L1 encode predicted protein
s of 376 amino acids and 377 amino acids, respectively. Northern blot analy
sis on RNA from different postnatal murine tissues showed a ubiquitous expr
ession pattern of mouse Nif3l1 with a transcript of approximately 1.85 kb.
RT-PCR analysis on prenatal mouse RNA and embryonic stem cell RNA demonstra
ted expression of Nif3l1 throughout embryonic development. Additionally, ex
pression analysis on cell lines revealed strong overexpression of Nif3l1 in
the spermatogonia-derived cell line GC-1 spg and in the teratocarcinoma ce
ll line F9. The mouse gene was mapped to chromosome 1, region C. Human NIF3
L1 consists of seven exons spanning 14.5 kb of genomic DNA and is located o
n chromosome 2q33. A fusion protein consisting of the GFP (green fluorescen
t protein) and the ORF of human NIF3L1 showed a localization of the predict
ed protein in the cytoplasm. In the N-terminal and C-terminal region, mouse
Nif3l1 and human NIF3L1 are strongly homologous to proteins of other speci
es, e.g. the recently cloned Drosophila symbol=anon-35F/36F gene with 41 %,
amino acid identity and several proteins from yeast including the yeast Ng
g1-interacting factor 3 homolog with 46 % amino acid identity, the hypothet
ical protein YGL221c and yeast Ngg1-interacting factor 3 (Nif3) with 37 % a
mino acid identity. Other proteins from lower organisms, e.g a conserved hy
pothetical protein from Ureaplasma urealyticum or a hypothetical protein SC
C30.09c from Streptomyces coelicolor show approximately 25-30 % amino acid
identity in the two flanking regions of the protein. These similarities ind
icate a high degree of conservation of mouse Nif3l1 and human NIF3L1 from b
acteria to mammals. Copyright (C) 2000 S. Karger AG, Basel.