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Protein

Spermatid perinuclear RNA-binding protein

Gene

STRBP

Organism
Homo sapiens (Human)
Status
Reviewed-Annotation score: Annotation score: 4 out of 5-Experimental evidence at protein leveli

Functioni

Involved in spermatogenesis and sperm function. Plays a role in regulation of cell growth. Binds to double-stranded DNA and RNA. Binds most efficiently to poly(I:C) RNA than to poly(dI:dC) DNA. Binds also to single-stranded poly(G) RNA. Binds non-specifically to the mRNA PRM1 3'-UTR and adenovirus VA RNA (By similarity).By similarity

GO - Molecular functioni

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Developmental protein

Keywords - Biological processi

Differentiation, Spermatogenesis

Keywords - Ligandi

DNA-binding, RNA-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Spermatid perinuclear RNA-binding protein
Gene namesi
Name:STRBP
Synonyms:SPNR
OrganismiHomo sapiens (Human)
Taxonomic identifieri9606 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaeHomo
ProteomesiUP000005640 Componenti: Chromosome 9

Organism-specific databases

HGNCiHGNC:16462. STRBP.

Subcellular locationi

  • Cytoplasm By similarity

  • Note: Microtubule-associated that localizes to the manchette in developing spermatids.By similarity

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Cytoplasm

Pathology & Biotechi

Organism-specific databases

PharmGKBiPA38145.

Polymorphism and mutation databases

BioMutaiSTRBP.
DMDMi74752134.

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 672672Spermatid perinuclear RNA-binding proteinPRO_0000274917Add
BLAST

Proteomic databases

PaxDbiQ96SI9.
PRIDEiQ96SI9.

PTM databases

PhosphoSiteiQ96SI9.

Expressioni

Gene expression databases

BgeeiQ96SI9.
CleanExiHS_STRBP.
ExpressionAtlasiQ96SI9. baseline and differential.
GenevisibleiQ96SI9. HS.

Organism-specific databases

HPAiHPA020651.

Interactioni

Subunit structurei

Interacts with EIF2AK2. Associates with microtubules; it is unsure whether such interaction is direct or indirect.By similarity

Binary interactionsi

WithEntry#Exp.IntActNotes
DAB1O755533EBI-740355,EBI-7875264
RBPMSQ930624EBI-740355,EBI-740322
TARBP2Q156333EBI-740355,EBI-978581
THAP1Q9NVV94EBI-740355,EBI-741515

Protein-protein interaction databases

BioGridi120623. 33 interactions.
IntActiQ96SI9. 12 interactions.
MINTiMINT-1434039.
STRINGi9606.ENSP00000321347.

Structurei

Secondary structure

1
672
Legend: HelixTurnBeta strand
Show more details
Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Beta strandi385 – 3873Combined sources
Helixi390 – 3989Combined sources
Beta strandi405 – 4117Combined sources
Beta strandi413 – 4153Combined sources
Beta strandi417 – 4248Combined sources
Beta strandi427 – 4359Combined sources
Helixi436 – 45116Combined sources

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
EntryMethodResolution (Å)ChainPositionsPDBsum
2DMYNMR-A378-461[»]
ProteinModelPortaliQ96SI9.
SMRiQ96SI9. Positions 5-332, 378-576.
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiQ96SI9.

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Domaini5 – 363359DZFPROSITE-ProRule annotationAdd
BLAST
Domaini387 – 45367DRBM 1PROSITE-ProRule annotationAdd
BLAST
Domaini510 – 57667DRBM 2PROSITE-ProRule annotationAdd
BLAST

Compositional bias

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Compositional biasi584 – 5874Poly-Lys

Sequence similaritiesi

Contains 2 DRBM (double-stranded RNA-binding) domains.PROSITE-ProRule annotation
Contains 1 DZF domain.PROSITE-ProRule annotation

Keywords - Domaini

Repeat

Phylogenomic databases

eggNOGiNOG269067.
GeneTreeiENSGT00550000074528.
HOVERGENiHBG069915.
InParanoidiQ96SI9.
KOiK13200.
OMAiQVEQCVD.
OrthoDBiEOG72ZCDC.
PhylomeDBiQ96SI9.
TreeFamiTF320194.

Family and domain databases

Gene3Di3.30.160.20. 2 hits.
InterProiIPR014720. dsRNA-bd_dom.
IPR006561. DZF_dom.
IPR030446. STRBP.
[Graphical view]
PANTHERiPTHR10910:SF27. PTHR10910:SF27. 1 hit.
PfamiPF00035. dsrm. 2 hits.
PF07528. DZF. 1 hit.
[Graphical view]
SMARTiSM00358. DSRM. 2 hits.
SM00572. DZF. 1 hit.
[Graphical view]
PROSITEiPS50137. DS_RBD. 2 hits.
PS51703. DZF. 1 hit.
[Graphical view]

Sequences (2)i

Sequence statusi: Complete.

This entry describes 2 isoformsi produced by alternative splicing. AlignAdd to basket

Isoform 1 (identifier: Q96SI9-1) [UniParc]FASTAAdd to basket

This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.

« Hide

        10         20         30         40         50
MRSIRSFAND DRHVMVKHST IYPSPEELEA VQNMVSTVEC ALKHVSDWLD
60 70 80 90 100
ETNKGTKTEG ETEVKKDEAG ENYSKDQGGR TLCGVMRIGL VAKGLLIKDD
110 120 130 140 150
MDLELVLMCK DKPTETLLNT VKDNLPIQIQ KLTEEKYQVE QCVNEASIII
160 170 180 190 200
RNTKEPTLTL KVILTSPLIR DELEKKDGEN VSMKDPPDLL DRQKCLNALA
210 220 230 240 250
SLRHAKWFQA RANGLKSCVI VLRILRDLCN RVPTWAPLKG WPLELICEKS
260 270 280 290 300
IGTCNRPLGA GEALRRVMEC LASGILLPGG PGLHDPCERD PTDALSYMTI
310 320 330 340 350
QQKEDITHSA QHALRLSAFG QIYKVLEMDP LPSSKPFQKY SWSVTDKEGA
360 370 380 390 400
GSSALKRPFE DGLGDDKDPN KKMKRNLRKI LDSKAIDLMN ALMRLNQIRP
410 420 430 440 450
GLQYKLLSQS GPVHAPVFTM SVDVDGTTYE ASGPSKKTAK LHVAVKVLQA
460 470 480 490 500
MGYPTGFDAD IECMSSDEKS DNESKNETVS SNSSNNTGNS TTETSSTLEV
510 520 530 540 550
RTQGPILTAS GKNPVMELNE KRRGLKYELI SETGGSHDKR FVMEVEVDGQ
560 570 580 590 600
KFRGAGPNKK VAKASAALAA LEKLFSGPNA ANNKKKKIIP QAKGVVNTAV
610 620 630 640 650
SAAVQAVRGR GRGTLTRGAF VGATAAPGYI APGYGTPYGY STAAPAYGLP
660 670
KRMVLLPVMK FPTYPVPHYS FF
Length:672
Mass (Da):73,653
Last modified:December 1, 2001 - v1
Checksum:i26465F4D3A429FBC
GO
Isoform 2 (identifier: Q96SI9-2) [UniParc]FASTAAdd to basket

The sequence of this isoform differs from the canonical sequence as follows:
     1-14: Missing.

Show »
Length:658
Mass (Da):71,967
Checksum:i131F93237EEF70B1
GO

Sequence cautioni

The sequence AAI08732.1 differs from that shown.Contaminating sequence. Potential poly-A sequence.Curated
The sequence BAA92120.1 differs from that shown. Reason: Erroneous initiation. Curated
The sequence BAB14873.1 differs from that shown. Reason: Erroneous initiation. Curated

Experimental Info

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Sequence conflicti173 – 1753LEK → IGRR in AAK20832 (Ref. 1) Curated
Sequence conflicti196 – 1961L → P in BAA92120 (PubMed:14702039).Curated

Natural variant

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Natural varianti280 – 2801G → R in a breast cancer sample; somatic mutation. 1 Publication
VAR_035662

Alternative sequence

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Alternative sequencei1 – 1414Missing in isoform 2. 1 PublicationVSP_022937Add
BLAST

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF333337 mRNA. Translation: AAK20832.1.
AL136866 mRNA. Translation: CAB66800.1.
AK002169 mRNA. Translation: BAA92120.1. Different initiation.
AK024285 mRNA. Translation: BAB14873.1. Different initiation.
AK027890 mRNA. Translation: BAB55434.1.
AL365338 Genomic DNA. Translation: CAH70299.1.
AL365338 Genomic DNA. Translation: CAH70300.1.
BC002693 mRNA. Translation: AAH02693.2.
BC017732 mRNA. Translation: AAH17732.1.
BC108731 mRNA. Translation: AAI08732.1. Sequence problems.
CCDSiCCDS55337.1. [Q96SI9-2]
CCDS6851.1. [Q96SI9-1]
RefSeqiNP_001164608.1. NM_001171137.1. [Q96SI9-2]
NP_060857.2. NM_018387.4. [Q96SI9-1]
XP_011517142.1. XM_011518840.1. [Q96SI9-1]
XP_011517143.1. XM_011518841.1. [Q96SI9-1]
UniGeneiHs.287659.
Hs.694157.

Genome annotation databases

EnsembliENST00000348403; ENSP00000321347; ENSG00000165209.
ENST00000360998; ENSP00000354271; ENSG00000165209. [Q96SI9-2]
ENST00000447404; ENSP00000415968; ENSG00000165209.
GeneIDi55342.
KEGGihsa:55342.
UCSCiuc004bns.3. human. [Q96SI9-1]

Keywords - Coding sequence diversityi

Alternative splicing, Polymorphism

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF333337 mRNA. Translation: AAK20832.1.
AL136866 mRNA. Translation: CAB66800.1.
AK002169 mRNA. Translation: BAA92120.1. Different initiation.
AK024285 mRNA. Translation: BAB14873.1. Different initiation.
AK027890 mRNA. Translation: BAB55434.1.
AL365338 Genomic DNA. Translation: CAH70299.1.
AL365338 Genomic DNA. Translation: CAH70300.1.
BC002693 mRNA. Translation: AAH02693.2.
BC017732 mRNA. Translation: AAH17732.1.
BC108731 mRNA. Translation: AAI08732.1. Sequence problems.
CCDSiCCDS55337.1. [Q96SI9-2]
CCDS6851.1. [Q96SI9-1]
RefSeqiNP_001164608.1. NM_001171137.1. [Q96SI9-2]
NP_060857.2. NM_018387.4. [Q96SI9-1]
XP_011517142.1. XM_011518840.1. [Q96SI9-1]
XP_011517143.1. XM_011518841.1. [Q96SI9-1]
UniGeneiHs.287659.
Hs.694157.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
EntryMethodResolution (Å)ChainPositionsPDBsum
2DMYNMR-A378-461[»]
ProteinModelPortaliQ96SI9.
SMRiQ96SI9. Positions 5-332, 378-576.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

BioGridi120623. 33 interactions.
IntActiQ96SI9. 12 interactions.
MINTiMINT-1434039.
STRINGi9606.ENSP00000321347.

PTM databases

PhosphoSiteiQ96SI9.

Polymorphism and mutation databases

BioMutaiSTRBP.
DMDMi74752134.

Proteomic databases

PaxDbiQ96SI9.
PRIDEiQ96SI9.

Protocols and materials databases

DNASUi55342.
Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsembliENST00000348403; ENSP00000321347; ENSG00000165209.
ENST00000360998; ENSP00000354271; ENSG00000165209. [Q96SI9-2]
ENST00000447404; ENSP00000415968; ENSG00000165209.
GeneIDi55342.
KEGGihsa:55342.
UCSCiuc004bns.3. human. [Q96SI9-1]

Organism-specific databases

CTDi55342.
GeneCardsiGC09M125871.
HGNCiHGNC:16462. STRBP.
HPAiHPA020651.
MIMi611138. gene.
neXtProtiNX_Q96SI9.
PharmGKBiPA38145.
GenAtlasiSearch...

Phylogenomic databases

eggNOGiNOG269067.
GeneTreeiENSGT00550000074528.
HOVERGENiHBG069915.
InParanoidiQ96SI9.
KOiK13200.
OMAiQVEQCVD.
OrthoDBiEOG72ZCDC.
PhylomeDBiQ96SI9.
TreeFamiTF320194.

Miscellaneous databases

ChiTaRSiSTRBP. human.
EvolutionaryTraceiQ96SI9.
GeneWikiiSTRBP.
GenomeRNAii55342.
NextBioi59667.
PROiQ96SI9.
SOURCEiSearch...

Gene expression databases

BgeeiQ96SI9.
CleanExiHS_STRBP.
ExpressionAtlasiQ96SI9. baseline and differential.
GenevisibleiQ96SI9. HS.

Family and domain databases

Gene3Di3.30.160.20. 2 hits.
InterProiIPR014720. dsRNA-bd_dom.
IPR006561. DZF_dom.
IPR030446. STRBP.
[Graphical view]
PANTHERiPTHR10910:SF27. PTHR10910:SF27. 1 hit.
PfamiPF00035. dsrm. 2 hits.
PF07528. DZF. 1 hit.
[Graphical view]
SMARTiSM00358. DSRM. 2 hits.
SM00572. DZF. 1 hit.
[Graphical view]
PROSITEiPS50137. DS_RBD. 2 hits.
PS51703. DZF. 1 hit.
[Graphical view]
ProtoNetiSearch...

Publicationsi

« Hide 'large scale' publications
  1. Sha J.H., Zhou Z.M., Li J.M.
    Submitted (JAN-2001) to the EMBL/GenBank/DDBJ databases
    Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1).
    Tissue: Testis.
  2. Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 2).
    Tissue: Testis.
  3. "Complete sequencing and characterization of 21,243 full-length human cDNAs."
    Ota T., Suzuki Y., Nishikawa T., Otsuki T., Sugiyama T., Irie R., Wakamatsu A., Hayashi K., Sato H., Nagai K., Kimura K., Makita H., Sekine M., Obayashi M., Nishi T., Shibahara T., Tanaka T., Ishii S.
    , Yamamoto J., Saito K., Kawai Y., Isono Y., Nakamura Y., Nagahari K., Murakami K., Yasuda T., Iwayanagi T., Wagatsuma M., Shiratori A., Sudo H., Hosoiri T., Kaku Y., Kodaira H., Kondo H., Sugawara M., Takahashi M., Kanda K., Yokoi T., Furuya T., Kikkawa E., Omura Y., Abe K., Kamihara K., Katsuta N., Sato K., Tanikawa M., Yamazaki M., Ninomiya K., Ishibashi T., Yamashita H., Murakawa K., Fujimori K., Tanai H., Kimata M., Watanabe M., Hiraoka S., Chiba Y., Ishida S., Ono Y., Takiguchi S., Watanabe S., Yosida M., Hotuta T., Kusano J., Kanehori K., Takahashi-Fujii A., Hara H., Tanase T.-O., Nomura Y., Togiya S., Komai F., Hara R., Takeuchi K., Arita M., Imose N., Musashino K., Yuuki H., Oshima A., Sasaki N., Aotsuka S., Yoshikawa Y., Matsunawa H., Ichihara T., Shiohata N., Sano S., Moriya S., Momiyama H., Satoh N., Takami S., Terashima Y., Suzuki O., Nakagawa S., Senoh A., Mizoguchi H., Goto Y., Shimizu F., Wakebe H., Hishigaki H., Watanabe T., Sugiyama A., Takemoto M., Kawakami B., Yamazaki M., Watanabe K., Kumagai A., Itakura S., Fukuzumi Y., Fujimori Y., Komiyama M., Tashiro H., Tanigami A., Fujiwara T., Ono T., Yamada K., Fujii Y., Ozaki K., Hirao M., Ohmori Y., Kawabata A., Hikiji T., Kobatake N., Inagaki H., Ikema Y., Okamoto S., Okitani R., Kawakami T., Noguchi S., Itoh T., Shigeta K., Senba T., Matsumura K., Nakajima Y., Mizuno T., Morinaga M., Sasaki M., Togashi T., Oyama M., Hata H., Watanabe M., Komatsu T., Mizushima-Sugano J., Satoh T., Shirai Y., Takahashi Y., Nakagawa K., Okumura K., Nagase T., Nomura N., Kikuchi H., Masuho Y., Yamashita R., Nakai K., Yada T., Nakamura Y., Ohara O., Isogai T., Sugano S.
    Nat. Genet. 36:40-45(2004) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 1).
    Tissue: Placenta and Retinoblastoma.
  4. "DNA sequence and analysis of human chromosome 9."
    Humphray S.J., Oliver K., Hunt A.R., Plumb R.W., Loveland J.E., Howe K.L., Andrews T.D., Searle S., Hunt S.E., Scott C.E., Jones M.C., Ainscough R., Almeida J.P., Ambrose K.D., Ashwell R.I.S., Babbage A.K., Babbage S., Bagguley C.L.
    , Bailey J., Banerjee R., Barker D.J., Barlow K.F., Bates K., Beasley H., Beasley O., Bird C.P., Bray-Allen S., Brown A.J., Brown J.Y., Burford D., Burrill W., Burton J., Carder C., Carter N.P., Chapman J.C., Chen Y., Clarke G., Clark S.Y., Clee C.M., Clegg S., Collier R.E., Corby N., Crosier M., Cummings A.T., Davies J., Dhami P., Dunn M., Dutta I., Dyer L.W., Earthrowl M.E., Faulkner L., Fleming C.J., Frankish A., Frankland J.A., French L., Fricker D.G., Garner P., Garnett J., Ghori J., Gilbert J.G.R., Glison C., Grafham D.V., Gribble S., Griffiths C., Griffiths-Jones S., Grocock R., Guy J., Hall R.E., Hammond S., Harley J.L., Harrison E.S.I., Hart E.A., Heath P.D., Henderson C.D., Hopkins B.L., Howard P.J., Howden P.J., Huckle E., Johnson C., Johnson D., Joy A.A., Kay M., Keenan S., Kershaw J.K., Kimberley A.M., King A., Knights A., Laird G.K., Langford C., Lawlor S., Leongamornlert D.A., Leversha M., Lloyd C., Lloyd D.M., Lovell J., Martin S., Mashreghi-Mohammadi M., Matthews L., McLaren S., McLay K.E., McMurray A., Milne S., Nickerson T., Nisbett J., Nordsiek G., Pearce A.V., Peck A.I., Porter K.M., Pandian R., Pelan S., Phillimore B., Povey S., Ramsey Y., Rand V., Scharfe M., Sehra H.K., Shownkeen R., Sims S.K., Skuce C.D., Smith M., Steward C.A., Swarbreck D., Sycamore N., Tester J., Thorpe A., Tracey A., Tromans A., Thomas D.W., Wall M., Wallis J.M., West A.P., Whitehead S.L., Willey D.L., Williams S.A., Wilming L., Wray P.W., Young L., Ashurst J.L., Coulson A., Blocker H., Durbin R.M., Sulston J.E., Hubbard T., Jackson M.J., Bentley D.R., Beck S., Rogers J., Dunham I.
    Nature 429:369-374(2004) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
  5. "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)."
    The MGC Project Team
    Genome Res. 14:2121-2127(2004) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 1).
    Tissue: Leiomyosarcoma, Retinoblastoma and Uterus.
  6. "Lys-N and trypsin cover complementary parts of the phosphoproteome in a refined SCX-based approach."
    Gauci S., Helbig A.O., Slijper M., Krijgsveld J., Heck A.J., Mohammed S.
    Anal. Chem. 81:4493-4501(2009) [PubMed] [Europe PMC] [Abstract]
    Cited for: IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS].
  7. Cited for: IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS].
  8. "System-wide temporal characterization of the proteome and phosphoproteome of human embryonic stem cell differentiation."
    Rigbolt K.T., Prokhorova T.A., Akimov V., Henningsen J., Johansen P.T., Kratchmarova I., Kassem M., Mann M., Olsen J.V., Blagoev B.
    Sci. Signal. 4:RS3-RS3(2011) [PubMed] [Europe PMC] [Abstract]
    Cited for: IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS].
  9. "Solution structure of DSRM domain in spermatid perinuclear RNA-binding protein."
    RIKEN structural genomics initiative (RSGI)
    Submitted (OCT-2006) to the PDB data bank
    Cited for: STRUCTURE BY NMR OF 378-461.
  10. Cited for: VARIANT [LARGE SCALE ANALYSIS] ARG-280.

Entry informationi

Entry nameiSTRBP_HUMAN
AccessioniPrimary (citable) accession number: Q96SI9
Secondary accession number(s): Q32NB9
, Q9BUE1, Q9BXG4, Q9H0B4, Q9H7V1, Q9NUK4
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 6, 2007
Last sequence update: December 1, 2001
Last modified: July 22, 2015
This is version 127 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program
DisclaimerAny medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care.

Miscellaneousi

Keywords - Technical termi

3D-structure, Complete proteome, Reference proteome

Documents

  1. Human chromosome 9
    Human chromosome 9: entries, gene names and cross-references to MIM
  2. Human entries with polymorphisms or disease mutations
    List of human entries with polymorphisms or disease mutations
  3. Human polymorphisms and disease mutations
    Index of human polymorphisms and disease mutations
  4. MIM cross-references
    Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot
  5. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  6. SIMILARITY comments
    Index of protein domains and families

External Data

Dasty 3

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into Uniref entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.