Leukocyte immunoglobulin-like receptor subfamily A member 3 (LILR-A3) also known as CD85 antigen-like family member E (CD85e), immunoglobulin-like transcript 6 (ILT-6), and leukocyte immunoglobulin-like receptor 4 (LIR-4) is a protein that in humans is encoded by the LILRA3gene located within the leukocyte receptor complex on chromosome 19q13.4.다른 많은 가족들과는 달리, LILRA3는 트랜섬브레인 도메인이 부족하다.LILRA3의 기능은 현재 알려져 있지 않지만, 다른 LILR 유전자와 매우 유사하며,[2]인간 백혈구 항원(HLA) 등급 I을 결합시킬 수 있다.따라서, 분비될 경우, LILRA3는 HLA 리간드와 멤브레인 결합 LILR(이펙터 및 메모리 CD8 T 세포에서 표현되는 억제 수용체 LILR1, 같은)의 상호작용을 손상시켜 면역 반응을 조절하고 질병에 대한 민감성에 영향을 미칠 수 있다.[3][4][5]
밀접하게 연관된 LILRA1과 마찬가지로, LILRA3는 HLA 클래스 I의 일반 및 '접히지 않은' 자유 헤비 체인에 결합되며, HLA-C 레일의 자유 헤비 체인을 선호한다.
^Arm JP, Nwankwo C, Austen KF (September 1997). "Molecular identification of a novel family of human Ig superfamily members that possess immunoreceptor tyrosine-based inhibition motifs and homology to the mouse gp49B1 inhibitory receptor". Journal of Immunology. 159 (5): 2342–9. PMID9278324.
^Borges L, Hsu ML, Fanger N, Kubin M, Cosman D (December 1997). "A family of human lymphoid and myeloid Ig-like receptors, some of which bind to MHC class I molecules". Journal of Immunology. 159 (11): 5192–6. PMID9548455.
Samaridis J, Colonna M (March 1997). "Cloning of novel immunoglobulin superfamily receptors expressed on human myeloid and lymphoid cells: structural evidence for new stimulatory and inhibitory pathways". European Journal of Immunology. 27 (3): 660–5. doi:10.1002/eji.1830270313. PMID9079806. S2CID2212182.
Wiśniewski A, Łuszczek W, Mańczak M, Jasek M, Kubicka W, Cislo M, Kuśnierczyk P (April 2003). "Distribution of LILRA3 (ILT6/LIR4) deletion in psoriatic patients and healthy controls". Human Immunology. 64 (4): 458–61. doi:10.1016/S0198-8859(03)00025-9. PMID12651072.
Norman PJ, Carey BS, Stephens HA, Vaughan RW (June 2003). "DNA sequence variation and molecular genotyping of natural killer leukocyte immunoglobulin-like receptor, LILRA3". Immunogenetics. 55 (3): 165–71. doi:10.1007/s00251-003-0561-1. PMID12750859. S2CID52863887.