Cla97C10G201635 (gene) Watermelon (97103) v2.5

Overview


Name	Cla97C10G201635
Type	gene
Organism	Citrullus lanatus subsp. vulgaris cv. 97103 (Watermelon (97103) v2.5)
Description	NAD(P)-binding Rossmann-fold superfamily protein
Location	Cla97Chr10: 31678614 .. 31679859 (-)
RNA-Seq Expression	Cla97C10G201635
Synteny	Cla97C10G201635

Sequences

The following sequences are available for this feature:

Gene sequence (with intron)

Legend: exonfive_prime_UTRpolypeptideCDS

Hold the cursor over a type above to highlight its positions in the sequence below.

TGGCACCCCTCTAGCCCCATCAATCCTCTCTGATCTCTCTCTCTAAGAAGAAGAATAAATGAGAGGCAGTGAGGTTATCTCCACAACAACAGGCCCAATGAGGTAATAATCCTCAGAAACATTTGGCTAACTTTTTTATACTTTCAACTTTCTCTTTAATTCTTCTTCTTATAAATCTACTTGATCATGTTCTAAGTTTTATATCCATCAATATTCATTTCCAAATTTTTCTTTTCTTCTTCTTTGGTTTTTTTTTCTAATTATTACTTTTTCCTAAATAAGAGACAAGAGGTAGTTTTGAAAATCGATTTTGGGTAATTATAGGGTCCATATATTTCCTGGTAATTTATATTGAGATATATATATATATATCTATTCACAAGGTAAAGAGATTTATTTTTGCTGGTAATATTTTTGTCATTAATGACCTAGTAATATTTTTGTCCAATAGTTGAGAGTCAAAGAAACACGCAAGTATATTAAATATTAACTAGGTGGTTACCATAGATTAAATCAATAATTTCATAACTATTTATGAAGTCATATCCCCTATTTATTACTGTGATGAAGATGCTAATGAGGATGAGGATGTGAATGATGACAATGCTAAGTATGTGTCAACCTATTTTTATCCAATCAAACTTTATATATCCTTTTCTTTCATTTATATTCTATCAACCACTCTCAACAATATATTCCTCCTGTGTGATCCGTCAGGCTAGAGGGAAAAGTAGCCCTAATAACCGGCGGCACAAGTGGGATCGGCGAATGTACAGCAAAACTCTTCATTCACCATGGCGCCAAAGTGGTCATCGCCGACATCCAAGACGACTTCGGTCACACCCTGTATTTTATATTGTAATGATATATGTTACAATATAAAATACAATTGATGTTGTATGTTACAACATAAATTGAATGAGAGATTTATAATATTTTTTAACTTATATAGGTTATGGATATCTACACTAAATATTATATTTATAATATCTAATACGTTTATAATACAAACTTATATTTAGTAGTTATTAGAGAAGACCTAGGTTAAATTTGGTTGCCGCATTGTATTTAATCCTAGCTTAGCCTTTTCATCTCAGACCTATTGTTTATGTGTATTTGTTTTCTTCTTCTTCTGCTCCTTGAAATTTTTGTAATAATTAAGGCTTTATTCAAGAAATCTATAAGGATAGATCTCGAGGAGTAACGATTTTTTTATTAAATTATTTTTATTTTCTTCAGGTCATGA

mRNA sequence

TGGCACCCCTCTAGCCCCATCAATCCTCTCTGATCTCTCTCTCTAAGAAGAAGAATAAATGAGAGGCAGTGAGGTTATCTCCACAACAACAGGCCCAATGAGGCTAGAGGGAAAAGTAGCCCTAATAACCGGCGGCACAAGTGGGATCGGCGAATGTACAGCAAAACTCTTCATTCACCATGGCGCCAAAGTGGTCATCGCCGACATCCAAGACGACTTCGGTCACACCCTGTCATGA

Coding sequence (CDS)

ATGAGAGGCAGTGAGGTTATCTCCACAACAACAGGCCCAATGAGGCTAGAGGGAAAAGTAGCCCTAATAACCGGCGGCACAAGTGGGATCGGCGAATGTACAGCAAAACTCTTCATTCACCATGGCGCCAAAGTGGTCATCGCCGACATCCAAGACGACTTCGGTCACACCCTGTCATGA

Protein sequence

MRGSEVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTLS

Homology

[Close]

BLAST of Cla97C10G201635 vs. NCBI nr
Match: XP_038903548.1 (secoisolariciresinol dehydrogenase-like [Benincasa hispida])

HSP 1 Score: 102.1 bits (253), Expect = 1.7e-18
Identity = 48/58 (82.76%), Postives = 50/58 (86.21%), Query Frame = 0


Query: 1  MRGSEVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          M  SEVIS  TGP RLEGKVALITGG SGIGECTAKLF+HHGAKVVIAD+QDD GH L
Sbjct: 1  MTSSEVISAATGPRRLEGKVALITGGASGIGECTAKLFVHHGAKVVIADVQDDLGHAL 58

[Close]

BLAST of Cla97C10G201635 vs. NCBI nr
Match: XP_008442883.1 (PREDICTED: secoisolariciresinol dehydrogenase-like [Cucumis melo] >KAA0043844.1 secoisolariciresinol dehydrogenase-like [Cucumis melo var. makuwa] >TYK25290.1 secoisolariciresinol dehydrogenase-like [Cucumis melo var. makuwa])

HSP 1 Score: 100.1 bits (248), Expect = 6.6e-18
Identity = 48/58 (82.76%), Postives = 50/58 (86.21%), Query Frame = 0


Query: 1  MRGSEVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          M  SEVIS TTG  RLEGKVALITGG SGIGECTAK+F+HHGAKVVIADIQDD GH L
Sbjct: 1  MTSSEVISLTTGQRRLEGKVALITGGASGIGECTAKIFVHHGAKVVIADIQDDLGHAL 58

[Close]

BLAST of Cla97C10G201635 vs. NCBI nr
Match: XP_004136700.3 (secoisolariciresinol dehydrogenase [Cucumis sativus])

HSP 1 Score: 99.0 bits (245), Expect = 1.5e-17
Identity = 47/58 (81.03%), Postives = 50/58 (86.21%), Query Frame = 0


Query: 1  MRGSEVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          M  SEVISTTTG  RLEGKVA+ITGG SGIGECTAKLF+HHGAKVV+ADIQDD G  L
Sbjct: 1  MTSSEVISTTTGQRRLEGKVAIITGGASGIGECTAKLFVHHGAKVVVADIQDDLGRAL 58

[Close]

BLAST of Cla97C10G201635 vs. NCBI nr
Match: KAE8651098.1 (hypothetical protein Csa_002484 [Cucumis sativus])

HSP 1 Score: 99.0 bits (245), Expect = 1.5e-17
Identity = 47/58 (81.03%), Postives = 50/58 (86.21%), Query Frame = 0


Query: 1  MRGSEVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          M  SEVISTTTG  RLEGKVA+ITGG SGIGECTAKLF+HHGAKVV+ADIQDD G  L
Sbjct: 1  MTSSEVISTTTGQRRLEGKVAIITGGASGIGECTAKLFVHHGAKVVVADIQDDLGRAL 58

[Close]

BLAST of Cla97C10G201635 vs. NCBI nr
Match: XP_004136701.3 (secoisolariciresinol dehydrogenase isoform X1 [Cucumis sativus])

HSP 1 Score: 98.6 bits (244), Expect = 1.9e-17
Identity = 47/58 (81.03%), Postives = 50/58 (86.21%), Query Frame = 0


Query: 1  MRGSEVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          M  +E+ISTTT   RLEGKVALITGG SGIGECTAKLF+HHGAKVVIADIQDD GH L
Sbjct: 1  MASNEIISTTTWQRRLEGKVALITGGASGIGECTAKLFVHHGAKVVIADIQDDLGHAL 58

[Close]

BLAST of Cla97C10G201635 vs. ExPASy Swiss-Prot
Match: Q94KL7 (Secoisolariciresinol dehydrogenase (Fragment) OS=Forsythia intermedia OX=55183 PE=1 SV=1)

HSP 1 Score: 73.6 bits (179), Expect = 8.6e-13
Identity = 34/44 (77.27%), Postives = 38/44 (86.36%), Query Frame = 0


Query: 15 RLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          RLEGKVALITGG SGIGE TAKLF  HGAKV IAD+QD+ GH++
Sbjct: 14 RLEGKVALITGGASGIGETTAKLFSQHGAKVAIADVQDELGHSV 57

[Close]

BLAST of Cla97C10G201635 vs. ExPASy Swiss-Prot
Match: H9BFQ1 (Tropinone reductase-like 2 OS=Erythroxylum coca OX=289672 PE=2 SV=1)

HSP 1 Score: 72.0 bits (175), Expect = 2.5e-12
Identity = 36/54 (66.67%), Postives = 43/54 (79.63%), Query Frame = 0


Query: 7  ISTTTGP-MRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTLS 60
          +++  GP  RLEGKVA+ITGG SGIG CTA+LF  +GAKVVIADIQDD G  L+
Sbjct: 1  MTSVAGPHKRLEGKVAIITGGASGIGACTAELFHENGAKVVIADIQDDLGQALA 54

[Close]

BLAST of Cla97C10G201635 vs. ExPASy Swiss-Prot
Match: H9BFQ0 (Tropinone reductase-like 1 OS=Erythroxylum coca OX=289672 PE=2 SV=1)

HSP 1 Score: 71.6 bits (174), Expect = 3.3e-12
Identity = 36/54 (66.67%), Postives = 43/54 (79.63%), Query Frame = 0


Query: 7  ISTTTGP-MRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTLS 60
          +++  GP  RLEGKVA+ITGG SGIG CTA+LF  +GAKVVIADIQDD G  L+
Sbjct: 1  MTSIAGPHKRLEGKVAIITGGASGIGACTAELFHENGAKVVIADIQDDLGQALA 54

[Close]

BLAST of Cla97C10G201635 vs. ExPASy Swiss-Prot
Match: F1SWA0 (Zerumbone synthase OS=Zingiber zerumbet OX=311405 GN=ZSD1 PE=1 SV=1)

HSP 1 Score: 69.7 bits (169), Expect = 1.2e-11
Identity = 31/46 (67.39%), Postives = 37/46 (80.43%), Query Frame = 0


Query: 14 MRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTLS 60
          MRLEGKVAL+TGG SGIGE  A+LFI HGAK+ I D+QD+ G  +S
Sbjct: 1  MRLEGKVALVTGGASGIGESIARLFIEHGAKICIVDVQDELGQQVS 46

[Close]

BLAST of Cla97C10G201635 vs. ExPASy Swiss-Prot
Match: Q7FAE1 (Momilactone A synthase OS=Oryza sativa subsp. japonica OX=39947 GN=Os04g0179200 PE=2 SV=1)

HSP 1 Score: 68.2 bits (165), Expect = 3.6e-11
Identity = 30/44 (68.18%), Postives = 38/44 (86.36%), Query Frame = 0


Query: 15 RLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          +L GKVA+ITGG SGIG CTA+LF+ HGA+VV+ADIQD+ G +L
Sbjct: 14 KLVGKVAVITGGASGIGACTARLFVKHGARVVVADIQDELGASL 57

[Close]

BLAST of Cla97C10G201635 vs. ExPASy TrEMBL
Match: A0A5A7TKJ5 (Secoisolariciresinol dehydrogenase-like OS=Cucumis melo var. makuwa OX=1194695 GN=E5676_scaffold352G004260 PE=4 SV=1)

HSP 1 Score: 100.1 bits (248), Expect = 3.2e-18
Identity = 48/58 (82.76%), Postives = 50/58 (86.21%), Query Frame = 0


Query: 1  MRGSEVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          M  SEVIS TTG  RLEGKVALITGG SGIGECTAK+F+HHGAKVVIADIQDD GH L
Sbjct: 1  MTSSEVISLTTGQRRLEGKVALITGGASGIGECTAKIFVHHGAKVVIADIQDDLGHAL 58

[Close]

BLAST of Cla97C10G201635 vs. ExPASy TrEMBL
Match: A0A1S3B7H5 (secoisolariciresinol dehydrogenase-like OS=Cucumis melo OX=3656 GN=LOC103486649 PE=4 SV=1)

HSP 1 Score: 100.1 bits (248), Expect = 3.2e-18
Identity = 48/58 (82.76%), Postives = 50/58 (86.21%), Query Frame = 0


Query: 1  MRGSEVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          M  SEVIS TTG  RLEGKVALITGG SGIGECTAK+F+HHGAKVVIADIQDD GH L
Sbjct: 1  MTSSEVISLTTGQRRLEGKVALITGGASGIGECTAKIFVHHGAKVVIADIQDDLGHAL 58

[Close]

BLAST of Cla97C10G201635 vs. ExPASy TrEMBL
Match: A0A0A0LGR0 (Uncharacterized protein OS=Cucumis sativus OX=3659 GN=Csa_3G778270 PE=4 SV=1)

HSP 1 Score: 99.0 bits (245), Expect = 7.1e-18
Identity = 47/58 (81.03%), Postives = 50/58 (86.21%), Query Frame = 0


Query: 1  MRGSEVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          M  SEVISTTTG  RLEGKVA+ITGG SGIGECTAKLF+HHGAKVV+ADIQDD G  L
Sbjct: 1  MTSSEVISTTTGQRRLEGKVAIITGGASGIGECTAKLFVHHGAKVVVADIQDDLGRAL 58

[Close]

BLAST of Cla97C10G201635 vs. ExPASy TrEMBL
Match: A0A0A0LEP1 (Uncharacterized protein OS=Cucumis sativus OX=3659 GN=Csa_3G778280 PE=4 SV=1)

HSP 1 Score: 98.6 bits (244), Expect = 9.3e-18
Identity = 47/58 (81.03%), Postives = 50/58 (86.21%), Query Frame = 0


Query: 1  MRGSEVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          M  +E+ISTTT   RLEGKVALITGG SGIGECTAKLF+HHGAKVVIADIQDD GH L
Sbjct: 1  MASNEIISTTTWQRRLEGKVALITGGASGIGECTAKLFVHHGAKVVIADIQDDLGHAL 58

[Close]

BLAST of Cla97C10G201635 vs. ExPASy TrEMBL
Match: A0A6J1J123 (secoisolariciresinol dehydrogenase-like OS=Cucurbita maxima OX=3661 GN=LOC111481719 PE=4 SV=1)

HSP 1 Score: 92.0 bits (227), Expect = 8.7e-16
Identity = 43/55 (78.18%), Postives = 47/55 (85.45%), Query Frame = 0


Query: 4  SEVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTL 59
          S++IS  T P RLEGKVA+ITGG SGIGECTAKLF+HHGAKVVIADIQDD G  L
Sbjct: 3  SQLISAPTAPRRLEGKVAIITGGASGIGECTAKLFVHHGAKVVIADIQDDLGQAL 57

[Close]

BLAST of Cla97C10G201635 vs. TAIR 10
Match: AT3G51680.1 (NAD(P)-binding Rossmann-fold superfamily protein )

HSP 1 Score: 62.8 bits (151), Expect = 1.1e-10
Identity = 31/55 (56.36%), Postives = 38/55 (69.09%), Query Frame = 0


Query: 5  EVISTTTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTLS 60
          E  +TT  P RLEGKVA+ITGG  GIG+ T  LF  HGA VVIAD+ +  G +L+
Sbjct: 21 EETNTTLYPKRLEGKVAIITGGAHGIGKATVMLFARHGATVVIADVDNVAGSSLA 75

[Close]

BLAST of Cla97C10G201635 vs. TAIR 10
Match: AT4G03140.1 (NAD(P)-binding Rossmann-fold superfamily protein )

HSP 1 Score: 62.4 bits (150), Expect = 1.4e-10
Identity = 30/41 (73.17%), Postives = 33/41 (80.49%), Query Frame = 0


Query: 15  RLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFG 56
           +LEGKVALITGG SGIG+ TA  FI HGAKV+IADIQ   G
Sbjct: 77  KLEGKVALITGGASGIGKATAGKFISHGAKVIIADIQPQIG 117

[Close]

BLAST of Cla97C10G201635 vs. TAIR 10
Match: AT2G47120.1 (NAD(P)-binding Rossmann-fold superfamily protein )

HSP 1 Score: 61.2 bits (147), Expect = 3.2e-10
Identity = 26/46 (56.52%), Postives = 35/46 (76.09%), Query Frame = 0


Query: 14 MRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTLS 60
          +RLEGK+ +ITGG SGIG   A+LF  HGAKVVI D+Q++ G  ++
Sbjct: 4  LRLEGKIVIITGGASGIGADAARLFTDHGAKVVIVDVQEELGQNVA 49

[Close]

BLAST of Cla97C10G201635 vs. TAIR 10
Match: AT3G29250.2 (NAD(P)-binding Rossmann-fold superfamily protein )

HSP 1 Score: 61.2 bits (147), Expect = 3.2e-10
Identity = 27/46 (58.70%), Postives = 35/46 (76.09%), Query Frame = 0


Query: 14 MRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTLS 60
          +RL+GK+A+ITGG SGIG    +LF  HGAKVVI DIQ++ G  L+
Sbjct: 4  LRLDGKIAIITGGASGIGAEAVRLFTDHGAKVVIVDIQEELGQNLA 49

[Close]

BLAST of Cla97C10G201635 vs. TAIR 10
Match: AT3G26760.1 (NAD(P)-binding Rossmann-fold superfamily protein )

HSP 1 Score: 59.7 bits (143), Expect = 9.2e-10
Identity = 26/50 (52.00%), Postives = 38/50 (76.00%), Query Frame = 0


Query: 10 TTGPMRLEGKVALITGGTSGIGECTAKLFIHHGAKVVIADIQDDFGHTLS 60
          +T   +LEGKVA+ITGG SGIG+ TA+ F+  GA+V+I DI ++ GH ++
Sbjct: 30 STSSRKLEGKVAVITGGASGIGKATAEEFVSQGAQVIIVDIDEEAGHMVA 79

The following BLAST results are available for this feature:

BLAST of Cla97C10G201635 vs. NCBI nr


Match Name	E-value	Identity	Description
XP_038903548.1	1.7e-18	82.76	secoisolariciresinol dehydrogenase-like [Benincasa hispida]	[more]
XP_008442883.1	6.6e-18	82.76	PREDICTED: secoisolariciresinol dehydrogenase-like [Cucumis melo] >KAA0043844.1 ...	[more]
XP_004136700.3	1.5e-17	81.03	secoisolariciresinol dehydrogenase [Cucumis sativus]	[more]
KAE8651098.1	1.5e-17	81.03	hypothetical protein Csa_002484 [Cucumis sativus]	[more]
XP_004136701.3	1.9e-17	81.03	secoisolariciresinol dehydrogenase isoform X1 [Cucumis sativus]	[more]

BLAST of Cla97C10G201635 vs. ExPASy Swiss-Prot


Match Name	E-value	Identity	Description
Q94KL7	8.6e-13	77.27	Secoisolariciresinol dehydrogenase (Fragment) OS=Forsythia intermedia OX=55183 P...	[more]
H9BFQ1	2.5e-12	66.67	Tropinone reductase-like 2 OS=Erythroxylum coca OX=289672 PE=2 SV=1	[more]
H9BFQ0	3.3e-12	66.67	Tropinone reductase-like 1 OS=Erythroxylum coca OX=289672 PE=2 SV=1	[more]
F1SWA0	1.2e-11	67.39	Zerumbone synthase OS=Zingiber zerumbet OX=311405 GN=ZSD1 PE=1 SV=1	[more]
Q7FAE1	3.6e-11	68.18	Momilactone A synthase OS=Oryza sativa subsp. japonica OX=39947 GN=Os04g0179200 ...	[more]

BLAST of Cla97C10G201635 vs. ExPASy TrEMBL


Match Name	E-value	Identity	Description
A0A5A7TKJ5	3.2e-18	82.76	Secoisolariciresinol dehydrogenase-like OS=Cucumis melo var. makuwa OX=1194695 G...	[more]
A0A1S3B7H5	3.2e-18	82.76	secoisolariciresinol dehydrogenase-like OS=Cucumis melo OX=3656 GN=LOC103486649 ...	[more]
A0A0A0LGR0	7.1e-18	81.03	Uncharacterized protein OS=Cucumis sativus OX=3659 GN=Csa_3G778270 PE=4 SV=1	[more]
A0A0A0LEP1	9.3e-18	81.03	Uncharacterized protein OS=Cucumis sativus OX=3659 GN=Csa_3G778280 PE=4 SV=1	[more]
A0A6J1J123	8.7e-16	78.18	secoisolariciresinol dehydrogenase-like OS=Cucurbita maxima OX=3661 GN=LOC111481...	[more]

BLAST of Cla97C10G201635 vs. TAIR 10


Match Name	E-value	Identity	Description
AT3G51680.1	1.1e-10	56.36	NAD(P)-binding Rossmann-fold superfamily protein	[more]
AT4G03140.1	1.4e-10	73.17	NAD(P)-binding Rossmann-fold superfamily protein	[more]
AT2G47120.1	3.2e-10	56.52	NAD(P)-binding Rossmann-fold superfamily protein	[more]
AT3G29250.2	3.2e-10	58.70	NAD(P)-binding Rossmann-fold superfamily protein	[more]
AT3G26760.1	9.2e-10	52.00	NAD(P)-binding Rossmann-fold superfamily protein	[more]

InterPro

Analysis Name: InterPro Annotations of Watermelon (97103) v2.5
Date Performed: 2022-01-31

Position :

Zoom :

x 1


IPR Term	IPR Description	Source	Source Term	Source Description	Alignment
None	No IPR available	GENE3D	3.40.50.720		coord: 7..58 e-value: 1.4E-14 score: 56.5
None	No IPR available	PANTHER	PTHR43180:SF71	SECOISOLARICIRESINOL DEHYDROGENASE-LIKE	coord: 11..58
None	No IPR available	PANTHER	PTHR43180	3-OXOACYL-(ACYL-CARRIER-PROTEIN) REDUCTASE (AFU_ORTHOLOGUE AFUA_6G11210)	coord: 11..58
IPR002347	Short-chain dehydrogenase/reductase SDR	PFAM	PF00106	adh_short	coord: 19..53 e-value: 4.4E-8 score: 32.8
IPR036291	NAD(P)-binding domain superfamily	SUPERFAMILY	51735	NAD(P)-binding Rossmann-fold domains	coord: 13..53

Relationships

The following mRNA feature(s) are a part of this gene:


Feature Name	Unique Name	Type
Cla97C10G201635.1	Cla97C10G201635.1	mRNA

GO Annotation

GO Assignments

This gene is annotated with the following GO terms.

Category	Term Accession	Term Name
biological_process	GO:0006412	translation
cellular_component	GO:0005840	ribosome
molecular_function	GO:0016491	oxidoreductase activity
molecular_function	GO:0003735	structural constituent of ribosome