Features of the two gene pairs RD-SKI2W and DOM3Z-RP1 located between complement component genes factor B and C4 at the MHC class III region.
Located at the 30 kb genomic region between complement factor B and component C4 are four ubiquitously expressed genes RD, SKI2W, DOM3Z and RP1. Besides RP1, the protein products of the other three genes each has highly conserved homologues or related proteins in lower eukaryotes, contains leucine zipper motifs for protein interaction, and plays important roles related to RNA metabolism. RD is a subunit of the negative transcription elongation factor, critical for the regulation of gene expression. It has an RNA recognition motif and 24 copies of Arg-Asp (RD) repeats. Ski2w is a nucleolar and cytoplasmic protein that has a putative RNA helicase domain. Fusion proteins of human Ski2w expressed in insect cells and bacteria have ATPase activity. The cytoplasmic protein of human Ski2w is associated with the polysomes and probably the 40S subunit of ribosomes. Ski2w is probably involved in the regulation of translation and RNA turnover. Dom3z is a nuclear protein whose yeast homologue forms a complex with an exoribonuclease. RP1 (or STK19) is a Ser/Thr nuclear protein kinase. No homologues of RP1 in lower eukaryotes have been discovered. Six polymorphic residues are present in human Ski2w and two in Dom3z. The potential roles of Ski2w and Dom3z on the clearance of degraded nuclear and cytoplasmic RNA raised their possibilities as susceptibility genes of systemic lupus erythematosus that is a disease with flawed processes in the removal of apoptotic materials.
Yang
Z
Z
Children's Research Institute, 700 Children's Drive, Columbus, Ohio 43205-2664, USA. zhenyu.yang@menlo.ppdi.com
Qu
X
X
Yu
C Y
CY
D000595:Amino Acid Sequence; D000818:Animals; D003181:Complement C4 / Q000235:genetics; D011415:Complement Factor B / Q000235:genetics; D004265:DNA Helicases / Q000737:chemistry / Q000235:genetics* / Q000502:physiology; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics* / Q000502:physiology; D005095:Exoribonucleases; D005136:Eye Proteins; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000235:genetics; D008285:Major Histocompatibility Complex; D051379:Mice; D008869:Microtubule-Associated Proteins; D008969:Molecular Sequence Data; D005810:Multigene Family; D009687:Nuclear Proteins / Q000737:chemistry / Q000235:genetics* / Q000502:physiology; D012313:RNA / Q000378:metabolism; D016601:RNA-Binding Proteins; D017386:Sequence Homology, Amino Acid; D015534:Trans-Activators / Q000737:chemistry / Q000235:genetics* / Q000502:physiology; D014157:Transcription Factors; D035602:Transcriptional Elongation Factors
D003181:Complement C4; D004268:DNA-Binding Proteins; D005136:Eye Proteins; D008869:Microtubule-Associated Proteins; D009687:Nuclear Proteins; D016601:RNA-Binding Proteins; C120042:RP1 protein, human; C498268:Rdbp protein, mouse; D015534:Trans-Activators; D014157:Transcription Factors; D035602:Transcriptional Elongation Factors; C118437:negative elongation factor; D012313:RNA; C440928:DXO protein, human; D005095:Exoribonucleases; D011415:Complement Factor B; D004265:DNA Helicases; C114718:SKIV2L protein, human