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FBXL5 F-box and leucine rich repeat protein 5 [ Homo sapiens (human) ]

Gene ID: 26234, updated on 25-Nov-2025
Official Symbol
FBXL5provided by HGNC
Official Full Name
F-box and leucine rich repeat protein 5provided by HGNC
Primary source
HGNC:HGNC:13602
See related
Ensembl:ENSG00000118564 MIM:605655; AllianceGenome:HGNC:13602
Gene type
protein coding
RefSeq status
REVIEWED
Organism
Homo sapiens
Lineage
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo
Also known as
FBL4; FBL5; FLR1
Summary
This gene encodes a member of the F-box protein family which is characterized by an approximately 40 amino acid motif, the F-box. The F-box proteins constitute one of the four subunits of ubiquitin protein ligase complex called SCFs (SKP1-cullin-F-box), which function in phosphorylation-dependent ubiquitination. The F-box proteins are divided into 3 classes: Fbws containing WD-40 domains, Fbls containing leucine-rich repeats, and Fbxs containing either different protein-protein interaction modules or no recognizable motifs. The protein encoded by this gene belongs to the Fbls class and, in addition to an F-box, contains several tandem leucine-rich repeats. Alternatively spliced transcript variants have been described for this locus. [provided by RefSeq, Aug 2010]
Expression
Ubiquitous expression in kidney (RPKM 49.5), fat (RPKM 39.0) and 25 other tissues See more
Orthologs
Try the new Gene page
Try the new Transcripts and proteins table
See FBXL5 in Genome Data Viewer
Location:
4p15.32
Exon count:
18
Annotation release Status Assembly Chr Location
RS_2025_08 current GRCh38.p14 (GCF_000001405.40) 4 NC_000004.12 (15604381..15681569, complement)
RS_2025_08 current T2T-CHM13v2.0 (GCF_009914755.1) 4 NC_060928.1 (15586272..15663882, complement)
RS_2024_09 previous assembly GRCh37.p13 (GCF_000001405.25) 4 NC_000004.11 (15606004..15656980, complement)

Chromosome 4 - NC_000004.12Genomic Context describing neighboring genes Neighboring gene C1QTNF7 antisense RNA 1 Neighboring gene C1q and TNF related 7 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21338 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21339 Neighboring gene uncharacterized LOC107986185 Neighboring gene OCT4-NANOG-H3K27ac-H3K4me1 hESC enhancer GRCh37_chr4:15480526-15481176 Neighboring gene OCT4-NANOG hESC enhancer GRCh37_chr4:15503443-15503998 Neighboring gene coiled-coil and C2 domain containing 2A Neighboring gene OCT4-NANOG-H3K4me1 hESC enhancer GRCh37_chr4:15545311-15545892 Neighboring gene CC2D2A antisense RNA 1 Neighboring gene ReSE screen-validated silencer GRCh37_chr4:15637196-15637392 Neighboring gene ReSE screen-validated silencer GRCh37_chr4:15648787-15649012 Neighboring gene ATAC-STARR-seq lymphoblastoid silent region 15296 Neighboring gene ATAC-STARR-seq lymphoblastoid silent region 15297 Neighboring gene ATAC-STARR-seq lymphoblastoid silent region 15298 Neighboring gene ReSE screen-validated silencer GRCh37_chr4:15656873-15657050 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21340 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21341 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21342 Neighboring gene ATAC-STARR-seq lymphoblastoid active region 21343 Neighboring gene family with sequence similarity 200 member B Neighboring gene OCT4-NANOG-H3K27ac hESC enhancer GRCh37_chr4:15696758-15697354 Neighboring gene ATAC-STARR-seq lymphoblastoid silent region 15300 Neighboring gene ribosomal protein L10a pseudogene 7 Neighboring gene bone marrow stromal cell antigen 1 Neighboring gene PFDN1 pseudogene 2

  • Project title: Tissue-specific circular RNA induction during human fetal development
  • Description: 35 human fetal samples from 6 tissues (3 - 7 replicates per tissue) collected between 10 and 20 weeks gestational time were sequenced using Illumina TruSeq Stranded Total RNA
  • BioProject: PRJNA270632
  • Publication: PMID 26076956
  • Analysis date: Mon Apr 2 22:54:59 2018

GeneRIFs: Gene References Into Functions

What's a GeneRIF?
Products Interactant Other Gene Complex Source Pubs Description

Markers

Gene Ontology Provided by GOA

Function Evidence Code Pubs
enables 2 iron, 2 sulfur cluster binding IEA
Inferred from Electronic Annotation
more info
 
enables iron ion binding IDA
Inferred from Direct Assay
more info
PubMed 
enables iron-sulfur cluster binding IEA
Inferred from Electronic Annotation
more info
 
enables metal ion binding IEA
Inferred from Electronic Annotation
more info
 
enables protein binding IPI
Inferred from Physical Interaction
more info
PubMed 
enables ubiquitin-protein transferase activity NAS
Non-traceable Author Statement
more info
PubMed 
Component Evidence Code Pubs
part_of SCF ubiquitin ligase complex IBA
Inferred from Biological aspect of Ancestor
more info
 
part_of SCF ubiquitin ligase complex IDA
Inferred from Direct Assay
more info
PubMed 
part_of SCF ubiquitin ligase complex IPI
Inferred from Physical Interaction
more info
PubMed 
located_in cytosol TAS
Traceable Author Statement
more info
 
located_in nucleus IEA
Inferred from Electronic Annotation
more info
 
located_in perinuclear region of cytoplasm IDA
Inferred from Direct Assay
more info
PubMed 
located_in perinuclear region of cytoplasm IEA
Inferred from Electronic Annotation
more info
 
part_of ubiquitin ligase complex NAS
Non-traceable Author Statement
more info
PubMed 
Preferred Names
F-box/LRR-repeat protein 5
Names
F-box protein FBL4/FBL5
p45SKP2-like protein

NEW Try the new Transcript table

RefSeqs maintained independently of Annotated Genomes

These reference sequences exist independently of genome builds. Explain

These reference sequences are curated independently of the genome annotation cycle, so their versions may not match the RefSeq versions in the current genome build. Identify version mismatches by comparing the version of the RefSeq in this section to the one reported in Genomic regions, transcripts, and products above.

Genomic

  1. NG_047143.2 RefSeqGene

    Range
    31212..82188
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

mRNA and Protein(s)

  1. NM_001193534.2NP_001180463.1  F-box/LRR-repeat protein 5 isoform 3

    See identical proteins and their annotated locations for NP_001180463.1

    Status: REVIEWED

    Description
    Transcript Variant: This variant (3) uses an alternate in-frame splice site in the 5' coding region, compared to variant 1. This results in a shorter protein (isoform 3), compared to isoform 1.
    Source sequence(s)
    AC116651, AF142481, AF199420, AI858616, BC030656, BF432189
    UniProtKB/TrEMBL
    H0Y9Y0
    Related
    ENSP00000554074.1, ENST00000884015.1
    Conserved Domains (4) summary
    cd09293
    Location:353407
    AMN1; Antagonist of mitotic exit network protein 1
    cd12109
    Location:7160
    Hr_FBXL5; Hemerythrin-like domain of FBXL5-like proteins
    sd00034
    Location:331356
    LRR_AMN1; leucine-rich repeat [structural motif]
    pfam12937
    Location:204248
    F-box-like; F-box-like
  2. NM_001193535.2NP_001180464.1  F-box/LRR-repeat protein 5 isoform 4

    See identical proteins and their annotated locations for NP_001180464.1

    Status: REVIEWED

    Description
    Transcript Variant: This variant (4) uses an alternate in-frame splice site in the 5' coding region, compared to variant 1. This results in a shorter protein (isoform 4), compared to isoform 1.
    Source sequence(s)
    AC116651, AI858616, BF432189, BX537957
    Consensus CDS
    CCDS54745.1
    UniProtKB/TrEMBL
    H0Y9Y0
    Related
    ENSP00000408679.2, ENST00000412094.6
    Conserved Domains (4) summary
    cd09293
    Location:337391
    AMN1; Antagonist of mitotic exit network protein 1
    cd12109
    Location:7143
    Hr_FBXL5; Hemerythrin-like domain of FBXL5-like proteins
    sd00034
    Location:315340
    LRR_AMN1; leucine-rich repeat [structural motif]
    pfam12937
    Location:188232
    F-box-like; F-box-like
  3. NM_001443847.1NP_001430776.1  F-box/LRR-repeat protein 5 isoform 11

    Status: REVIEWED

    Source sequence(s)
    AC007016, AC114744, AC116651
  4. NM_001443848.1NP_001430777.1  F-box/LRR-repeat protein 5 isoform 12

    Status: REVIEWED

    Source sequence(s)
    AC007016, AC114744, AC116651
  5. NM_012161.4NP_036293.1  F-box/LRR-repeat protein 5 isoform 1

    See identical proteins and their annotated locations for NP_036293.1

    Status: REVIEWED

    Description
    Transcript Variant: This variant (1) encodes the longest isoform (1).
    Source sequence(s)
    AC116651, AF142481, AI858616, BC030656, BF432189
    Consensus CDS
    CCDS3415.1
    UniProtKB/Swiss-Prot
    A8MSK4, B4DIB5, Q4W5A8, Q8NHP3, Q9NXN2, Q9P0I0, Q9P0X5, Q9UJT7, Q9UKA1, Q9UKC8
    UniProtKB/TrEMBL
    H0Y9Y0
    Related
    ENSP00000344866.3, ENST00000341285.8
    Conserved Domains (4) summary
    cd09293
    Location:354408
    AMN1; Antagonist of mitotic exit network protein 1
    cd12109
    Location:7160
    Hr_FBXL5; Hemerythrin-like domain of FBXL5-like proteins
    sd00034
    Location:332357
    LRR_AMN1; leucine-rich repeat [structural motif]
    pfam12937
    Location:205249
    F-box-like; F-box-like

RNA

  1. NR_036464.2 RNA Sequence

    Status: REVIEWED

    Description
    Transcript Variant: This variant (2) contains an alternate internal exon compared to variant 1. This variant is represented as non-coding because the use of the 5'-most supported translational start codon, as used in variant 1, renders the transcript a candidate for nonsense-mediated mRNA decay (NMD).
    Source sequence(s)
    AC116651, AI858616, BC012320, BC030656, BF432189
    Related
    ENST00000511441.5

RefSeqs of Annotated Genomes: GCF_000001405.40-RS_2025_08

The following sections contain reference sequences that belong to a specific genome build. Explain

Reference GRCh38.p14 Primary Assembly

Genomic

  1. NC_000004.12 Reference GRCh38.p14 Primary Assembly

    Range
    15604381..15681569 complement
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)
  2. NC_000004.12 Reference GRCh38.p14 Primary Assembly

    Range
    15507612..15514707 complement
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

mRNA and Protein(s)

  1. XM_047450056.1XP_047306012.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  2. XM_047450055.1XP_047306011.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  3. XM_047450059.1XP_047306015.1  F-box/LRR-repeat protein 5 isoform X2

    UniProtKB/TrEMBL
    H0Y9Y0
  4. XM_047450050.1XP_047306006.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  5. XM_011513831.3XP_011512133.1  F-box/LRR-repeat protein 5 isoform X2

    UniProtKB/TrEMBL
    H0Y9Y0
    Conserved Domains (4) summary
    cd09293
    Location:318372
    AMN1; Antagonist of mitotic exit network protein 1
    cd12109
    Location:9124
    Hr_FBXL5; Hemerythrin-like domain of FBXL5-like proteins
    sd00034
    Location:296321
    LRR_AMN1; leucine-rich repeat [structural motif]
    pfam12937
    Location:169213
    F-box-like; F-box-like
  6. XM_047450054.1XP_047306010.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  7. XM_047450053.1XP_047306009.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  8. XM_047450058.1XP_047306014.1  F-box/LRR-repeat protein 5 isoform X2

    UniProtKB/TrEMBL
    H0Y9Y0
  9. XM_047450049.1XP_047306005.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  10. XM_047450057.1XP_047306013.1  F-box/LRR-repeat protein 5 isoform X2

    UniProtKB/TrEMBL
    H0Y9Y0
  11. XM_006713959.4XP_006714022.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
    Conserved Domains (4) summary
    cd09293
    Location:335389
    AMN1; Antagonist of mitotic exit network protein 1
    cd12109
    Location:10141
    Hr_FBXL5; Hemerythrin-like domain of FBXL5-like proteins
    sd00034
    Location:313338
    LRR_AMN1; leucine-rich repeat [structural motif]
    pfam12937
    Location:186230
    F-box-like; F-box-like
  12. XM_047450060.1XP_047306016.1  F-box/LRR-repeat protein 5 isoform X2

    UniProtKB/TrEMBL
    H0Y9Y0
  13. XM_017008019.3XP_016863508.1  F-box/LRR-repeat protein 5 isoform X3

    UniProtKB/TrEMBL
    H0Y9Y0
    Conserved Domains (4) summary
    cd09293
    Location:299353
    AMN1; Antagonist of mitotic exit network protein 1
    cd12109
    Location:1105
    Hr_FBXL5; Hemerythrin-like domain of FBXL5-like proteins
    sd00034
    Location:277302
    LRR_AMN1; leucine-rich repeat [structural motif]
    pfam12937
    Location:150194
    F-box-like; F-box-like
  14. XM_047450061.1XP_047306017.1  F-box/LRR-repeat protein 5 isoform X3

    UniProtKB/TrEMBL
    H0Y9Y0
  15. XM_047450051.1XP_047306007.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  16. XM_047450052.1XP_047306008.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  17. XM_011513833.3XP_011512135.1  F-box/LRR-repeat protein 5 isoform X4

    UniProtKB/TrEMBL
    H0Y9Y0
    Related
    ENSP00000554072.1, ENST00000884013.1
    Conserved Domains (4) summary
    cd09293
    Location:282336
    AMN1; Antagonist of mitotic exit network protein 1
    sd00034
    Location:260285
    LRR_AMN1; leucine-rich repeat [structural motif]
    pfam12937
    Location:133177
    F-box-like; F-box-like
    cl15774
    Location:2088
    Hemerythrin-like; Hemerythrin family

Alternate T2T-CHM13v2.0

Genomic

  1. NC_060928.1 Alternate T2T-CHM13v2.0

    Range
    15586272..15663882 complement
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

mRNA and Protein(s)

  1. XM_054349670.1XP_054205645.1  F-box/LRR-repeat protein 5 isoform X2

    UniProtKB/TrEMBL
    H0Y9Y0
  2. XM_054349654.1XP_054205629.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  3. XM_054349655.1XP_054205630.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  4. XM_054349668.1XP_054205643.1  F-box/LRR-repeat protein 5 isoform X2

    UniProtKB/TrEMBL
    H0Y9Y0
  5. XM_054349652.1XP_054205627.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  6. XM_054349666.1XP_054205641.1  F-box/LRR-repeat protein 5 isoform X2

    UniProtKB/TrEMBL
    H0Y9Y0
  7. XM_054349656.1XP_054205631.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  8. XM_054349660.1XP_054205635.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  9. XM_054349659.1XP_054205634.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  10. XM_054349669.1XP_054205644.1  F-box/LRR-repeat protein 5 isoform X2

    UniProtKB/TrEMBL
    H0Y9Y0
  11. XM_054349653.1XP_054205628.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  12. XM_054349665.1XP_054205640.1  F-box/LRR-repeat protein 5 isoform X2

    UniProtKB/TrEMBL
    H0Y9Y0
  13. XM_054349658.1XP_054205633.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  14. XM_054349657.1XP_054205632.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  15. XM_054349664.1XP_054205639.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  16. XM_054349667.1XP_054205642.1  F-box/LRR-repeat protein 5 isoform X2

    UniProtKB/TrEMBL
    H0Y9Y0
  17. XM_054349661.1XP_054205636.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  18. XM_054349663.1XP_054205638.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  19. XM_054349671.1XP_054205646.1  F-box/LRR-repeat protein 5 isoform X3

    UniProtKB/TrEMBL
    H0Y9Y0
  20. XM_054349662.1XP_054205637.1  F-box/LRR-repeat protein 5 isoform X1

    UniProtKB/TrEMBL
    H0Y9Y0
  21. XM_054349672.1XP_054205647.1  F-box/LRR-repeat protein 5 isoform X4

    UniProtKB/TrEMBL
    H0Y9Y0