The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.
We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.
We are interested in where in or outside the cell the gene product carries out its function.
We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.
Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.
The identity check is consistent: CG3631 (FlyBase FBgn0038268; UniProt Q95T10) is a Drosophila melanogaster FAM20-family protein most closely related to mammalian FAM20B, the glycosaminoglycan xylosylkinase. It is not CG31145, the separate fly FAM20C-like protein. Its FAM20/FAM20_C domains, precursor annotation, secretory-pathway targeting, and evolutionary placement all support this assignment. No conflicting literature on a same-named gene in another organism was used. (ishikawa2012therainesyndrome pages 2-3, zhang2018structureandevolution pages 8-9, zhang2018structureandevolution pages 9-10)
The best current functional annotation is therefore:
CG3631 is probably an ATP-dependent secretory-pathway glycan kinase that transfers phosphate to the 2-hydroxyl of xylose in Galβ1–4Xyl-containing linkage intermediates on proteoglycan core proteins. This transient modification promotes formation of the common linker used to initiate heparan-sulfate and chondroitin-sulfate chains.
This conclusion is strong at the family/orthology level but remains not directly demonstrated with purified Q95T10. Direct CG3631 evidence currently establishes intracellular secretory-pathway localization, not catalytic activity or an in-vivo phenotype. (ishikawa2012therainesyndrome pages 2-3)
| Annotation claim | Best-supported conclusion | Evidence level | Key evidence | Confidence / caveat |
|---|---|---|---|---|
| Protein identity | CG3631/Q95T10 is the D. melanogaster FAM20B-like paralog, not the distinct FAM20C-like protein CG31145. | Direct CG3631 plus evolutionary evidence | CG3631 was explicitly identified as most closely related to mammalian FAM20B; Drosophila has one Fam20B-like and one Fam20C-like gene. (ishikawa2012therainesyndrome pages 2-3, zhang2018structureandevolution pages 8-9, zhang2018structureandevolution pages 9-10) | High. Avoid transferring CG31145/FAM20C protein-substrate kinase results to CG3631. |
| Family, domains, and precursor status | The protein belongs to the atypical FAM20 secretory-pathway kinase family and contains the conserved C-terminal FAM20 catalytic domain; its annotated precursor/signal sequence predicts entry into the secretory pathway. | Direct sequence annotation plus ortholog-based interpretation | FAM20 proteins share a C-terminal kinase-like domain and an N-terminal secretory-pathway targeting sequence; conserved CG3631/Fam20B sequence regions support the family assignment. (worby2021theabcsof pages 1-2, zhang2018structureandevolution pages 8-9) | High for family; moderate for topology. Signal-peptide cleavage versus an uncleaved membrane anchor has not been tested directly for CG3631. |
| Cellular localization | Tagged CG3631 occupies early secretory-pathway compartments, overlapping ER and Golgi markers in transfected S2 cells. | Direct CG3631 | V5-tagged CG3631 was examined with ER/Golgi markers and showed ER/Golgi overlap, unlike the more Golgi-restricted CG31145. (ishikawa2012therainesyndrome pages 2-3, ishikawa2012therainesyndrome pages 7-8) | Moderate. Based on overexpressed tagged protein, not endogenous localization in fly tissues. |
| Secretion | CG3631 was retained intracellularly under the S2-cell assay conditions rather than being detectably released into conditioned medium. | Direct CG3631 | Anti-V5 analysis detected CG3631 in cell lysate but not conditioned medium; CG31145 was detected in both and must not be conflated with it. (ishikawa2012therainesyndrome pages 2-3) | Moderate–high for that assay. Does not exclude regulated secretion, cleavage, or tissue-specific release in vivo. |
| Primary catalytic reaction | The most likely reaction is ATP-dependent 2-O-phosphorylation of the xylose in a nascent proteoglycan linker: ATP + Gal–Xyl–O–core protein → ADP + Gal–Xyl(2-O-phosphate)–O–core protein. | Ortholog-based | Fam20B phosphorylates the xylose C2 hydroxyl; structural and evolutionary work places the Drosophila Fam20B sequence in the conserved xylosylkinase lineage. (sammon2023molecularmechanismof pages 1-3, zhang2018structureandevolution pages 8-9, zhang2018structureandevolution pages 1-2) | Moderate–high as functional annotation, but not directly demonstrated for purified CG3631. EC subclass remains incompletely specified. |
| Substrate specificity | The likely minimal preferred glycan determinant is Galβ1–4Xyl; tri- and tetrasaccharide linker intermediates are also accepted, whereas isolated Xyl is a poor substrate. | Ortholog-based biochemical and structural evidence | Fam20B-like enzymes possess a Gal–Xyl-binding pocket; mammalian FAM20B gave Kₘ values of approximately 42 μM for Gal–Xyl–benzyl and 40 μM for a linker tetrasaccharide, with little activity toward Xyl–benzyl. (lin2025recentadvancesin pages 2-3, zhang2018structureandevolution pages 6-7, zhang2018structureandevolution pages 7-8) | Moderate for CG3631. Quantitative constants are not measurements of the fly enzyme. |
| HS/CS proteoglycan pathway role | CG3631 probably phosphorylates the common linker used by both heparan-sulfate and chondroitin-sulfate proteoglycans, accelerating linker completion and branch initiation rather than determining HS versus CS identity by itself. | Ortholog-based, supported by direct fly glycan chemistry | Reconstituted mammalian biosynthesis showed phosphorylation promotes B3GALT6/B3GAT3-dependent linker maturation and both EXTL3-mediated HS and CSGALNACT-mediated CS initiation, without affecting later backbone polymerization. (sammon2023molecularmechanismof pages 7-8, sammon2023molecularmechanismof pages 6-7, sammon2023molecularmechanismof pages 1-3) | Moderate. The pathway model is strong, but CG3631-dependent flux through either fly branch has not been measured. |
| Phosphoxylose in Drosophila proteoglycans | The predicted reaction occurs in the species: phosphorylated xylose has been detected on the Drosophila chondroitin-sulfate proteoglycan Windpipe. | Direct Drosophila species-level | LC–MS/MS identified a Windpipe glycopeptide carrying two CS linkage glycans, one containing a phosphorylated xylose; Windpipe’s CS chains modulate Hedgehog signaling. (takemura2020chondroitinsulfateproteoglycan pages 1-2) | High for the modification; low for enzyme attribution. The study did not genetically connect that phosphate to CG3631. |
| Direct activity and phenotype evidence | No purified-CG3631 enzyme assay, endogenous substrate test, gene-specific knockout phenotype, or in-vivo pathway analysis was identified. | Direct evidence gap | Published CG3631 work documents localization and lysate/medium distribution, while kinase assays in the same study concerned mammalian FAM20C rather than CG3631. (ishikawa2012therainesyndrome pages 2-3, ishikawa2012therainesyndrome pages 7-8) | High-confidence limitation. “Glycosaminoglycan xylosylkinase” is a well-supported orthology-based annotation, not yet a direct biochemical demonstration for Q95T10. |
Table: Conservative annotation of CG3631/Q95T10 separating direct gene-level and species-level observations from FAM20B orthology-based inference. It also identifies the principal unresolved experimental gaps.
The supplied accession Q95T10 corresponds to the D. melanogaster ORF CG3631/FBgn0038268. Ishikawa and colleagues explicitly identified CG3631 as one of two fly FAM20-family genes and as the one most closely related to mammalian FAM20B. The other fly paralog, CG31145, is the FAM20C-like kinase and must not be confused with CG3631. (ishikawa2012therainesyndrome pages 2-3)
Later phylogenetic and structural work likewise concluded that Drosophila has one Fam20B-type and one Fam20C-type gene. Sequence comparisons include a Drosophila Fam20B in the ancestral xylosylkinase branch, with conserved catalytic-context regions, whereas the Fam20C lineage acquired different substrate-selectivity features and dimerization. (zhang2018structureandevolution pages 8-9, zhang2018structureandevolution pages 9-10)
Q95T10 is annotated with FAM20/FAM20_C/Fam20C-family domains. Despite the Pfam label “Fam20C,” this profile represents the shared atypical kinase fold and does not make the protein a FAM20C ortholog. Fam20B is a catalytically active glycan kinase; Fam20C is predominantly a secreted-protein kinase; and Fam20A is principally a pseudokinase and Fam20C activator. All share the divergent C-terminal Fam20 kinase-like domain. (worby2021theabcsof pages 1-2)
The precursor flag and predicted N-terminal signal sequence are consistent with entry into the secretory pathway. Early analyses noted that such N-terminal hydrophobic sequences could be cleaved signal peptides or, if uncleaved, membrane anchors. CG3631 topology and signal-peptide cleavage have not been measured directly. (ishikawa2012therainesyndrome pages 2-3)
By orthology to FAM20B, the likely reaction is:
ATP + proteoglycan–Galβ1–4Xyl–O–Ser → ADP + proteoglycan–Galβ1–4Xyl(2-O-phosphate)–O–Ser
The acceptor is the C2 hydroxyl of xylose, not an amino-acid side chain. CG3631 should consequently be described as a glycan/xylosyl kinase, rather than as a conventional protein kinase. Fam20B structural work identifies a conserved ATP-binding site adjacent to a specialized Gal–Xyl-binding pocket. (sammon2023molecularmechanismof pages 1-3, zhang2018structureandevolution pages 7-8, zhang2018structureandevolution pages 1-2)
The exact EC sub-subclass remains unspecified in the supplied UniProt record (EC 2.7.1.-), appropriately reflecting incomplete direct characterization.
The best-defined FAM20B recognition element is Galβ1–4Xyl. Mammalian FAM20B phosphorylated both Gal–Xyl–benzyl and the complete linker tetrasaccharide GlcAβ1–3Galβ1–3Galβ1–4Xyl–benzyl, with reported Km values of approximately 42 and 40 μM, respectively, while isolated Xyl–benzyl was a poor substrate. Tri- and tetrasaccharide linkage-region acceptors were also phosphorylated at reported activities of 128 and 102 pmol h⁻¹ mL⁻¹, respectively. These values characterize FAM20B-family enzymes—not CG3631 itself. (lin2025recentadvancesin pages 2-3, lin2025recentadvancesin pages 3-4)
Structural analysis of the Hydra FAM20B-like enzyme resolved a Gal–Xyl-binding pocket containing Thr114, Gln115, Tyr148, Gly150, Tyr253, Asp299, His301, and Lys321. Asp299 contacts the xylose C2 hydroxyl and acts as the catalytic base; mutation of corresponding human FAM20B residues strongly reduced activity. A K312R substitution abolished activity. Conservation of this specialized pocket explains why Fam20B recognizes glycan intermediates whereas Fam20C prefers protein substrates. (zhang2018structureandevolution pages 7-8, lin2025recentadvancesin pages 3-4)
These biochemical constants and residue numbers should not be assigned directly to Q95T10 without fly-protein assays and sequence-position mapping. Nevertheless, the conservation of Fam20B activity across basal animals, together with the Drosophila sequence placement, makes equivalent substrate specificity a well-supported prediction. (zhang2018structureandevolution pages 6-7, zhang2018structureandevolution pages 8-9)
The only identified direct localization experiment expressed V5-tagged CG3631 in Drosophila S2 cells. CG3631 overlapped markers of both the endoplasmic reticulum and Golgi/secretory compartments and was detected in cell lysate but not detectably in conditioned medium. By contrast, the FAM20C-like CG31145 was more Golgi-restricted and appeared in both lysate and medium. (ishikawa2012therainesyndrome pages 2-3)
Thus, CG3631 most likely carries out its function on nascent proteoglycans in the lumen of the ER–Golgi secretory pathway, probably principally during Golgi linker assembly. It should not currently be annotated as a freely secreted extracellular enzyme. However, the evidence comes from overexpressed tagged protein in cultured cells; endogenous tissue localization, membrane orientation, Golgi-subcompartment residence, and regulated release remain unknown. (ishikawa2012therainesyndrome pages 2-3, ishikawa2012therainesyndrome pages 7-8)
Heparan sulfate (HS) and chondroitin sulfate (CS) are attached to core proteins through a shared linker:
GlcAβ1–3Galβ1–3Galβ1–4Xylβ1–O–Ser.
Current biochemical models place FAM20B action after xylosylation and addition of the first galactose. FAM20B phosphorylates Xyl at its 2-O position; this increases the efficiency of subsequent linker reactions catalyzed by B3GALT6 and B3GAT3 and promotes branch initiation by both EXTL3 for HS and CSGALNACT enzymes for CS. (sammon2023molecularmechanismof pages 7-8, sammon2023molecularmechanismof pages 1-3)
The phosphate has historically been described as a transient “molecular switch.” Mammalian studies identified a Golgi 2-phosphoxylose phosphatase, XYLP, and proposed that coordinated phosphorylation and dephosphorylation regulate linker completion and prevent accumulation of dead-end intermediates. (koike2014identificationofphosphatase pages 13-14, koike2022alteredsulfationstatus pages 1-2)
A 2023 Nature Communications reconstitution study showed that FAM20B-mediated phosphorylation accelerates common-linker maturation and the initiation of both HS and CS. Once HS had been primed, however, phosphorylation had no detectable effect—positive or negative—on subsequent EXT1/EXT2-mediated backbone elongation. The most precise current interpretation is therefore that Fam20B regulates linker assembly and branch initiation, rather than polymer lengthening itself or independently specifying an HS-versus-CS fate. (sammon2023molecularmechanismof pages 7-8, sammon2023molecularmechanismof pages 6-7, sammon2023molecularmechanismof pages 1-3)
This work was performed with mammalian biosynthetic machinery and does not test CG3631 directly. It nevertheless provides the most current mechanistic model for interpreting a FAM20B ortholog.
Structural/evolutionary analysis reports that xylose phosphorylation in fly HS/CS linkage regions has been demonstrated and considers the fly Fam20B the probable responsible enzyme, but does not report a CG3631 perturbation or purified-enzyme test. (zhang2018structureandevolution pages 9-10)
More specifically, LC–MS/MS glycoproteomics identified phosphorylated linkage-region xylose on Windpipe (Wdp), a Drosophila transmembrane chondroitin-sulfate proteoglycan. The analyzed Wdp glycopeptide carried two CS linkage glycans, one containing phosphoxylose. Wdp’s CS chains are required for its inhibition of Hedgehog signaling: Wdp overexpression reduced Hedgehog activity, whereas loss or knockdown increased it. This is compelling evidence that the predicted phosphoxylose product exists on a defined fly proteoglycan, but the study did not identify CG3631 as the enzyme responsible. (takemura2020chondroitinsulfateproteoglycan pages 1-2)
Accordingly, Wdp is a plausible candidate physiological substrate class for CG3631, not a validated direct CG3631 substrate.
The immediate process most plausibly assigned to CG3631 is proteoglycan glycosaminoglycan-linker biosynthesis, affecting both HSPGs and CSPGs. Because these glycans organize extracellular ligands and receptor interactions, changing linker-production efficiency can indirectly influence developmental signaling. In flies, proteoglycans participate in Hedgehog and other morphogen systems; the Wdp study gives a concrete CS-dependent Hedgehog example. Nevertheless, there is currently no evidence that CG3631 directly phosphorylates a signaling protein or belongs to the core Hedgehog transduction machinery. Its predicted signaling effects are upstream and biochemical—through proteoglycan production. (sammon2023molecularmechanismof pages 1-3, takemura2020chondroitinsulfateproteoglycan pages 1-2)
Mammalian knockout data illustrate the pathway’s potential quantitative importance. FAM20B-null U2OS cells showed an approximately 95% reduction in total GAG, whereas knockout CHO cells showed about a threefold reduction in CS and sixfold reduction in HS. The different magnitudes show that dependence on Fam20B varies with cellular context and that residual synthesis can occur. These statistics should be used only as ortholog-based functional context, not as estimates for CG3631-null flies. (lin2025recentadvancesin pages 5-5)
The most relevant recent advance is the 2023 mechanistic reconstitution separating linker/branch initiation from later polymerization. It places Fam20B at a kinetic control point shared by HS and CS, while showing that branch selection depends substantially on the initiating glycosyltransferases and core-protein context rather than FAM20B alone. (sammon2023molecularmechanismof pages 7-8, sammon2023molecularmechanismof pages 1-3)
A 2024 synthesis of proteoglycan-biosynthetic genetics described at least 51 genes in the human HSPG pathway and emphasized substrate preferences and enzyme interactions as determinants of flux between HS and CS. This reinforces the interpretation of FAM20B as one regulatory component in a multi-enzyme Golgi assembly system, rather than a stand-alone branch-specifying switch.
Current practical applications are primarily research-oriented:
No study identified in this search has demonstrated:
The kinase kinetics reported in Ishikawa et al.—including casein phosphorylation—belong to mammalian FAM20C and must not be transferred to CG3631. The same study’s CG3631 data were limited to expression/localization and lysate-versus-medium analysis. (ishikawa2012therainesyndrome pages 2-3, ishikawa2012therainesyndrome pages 7-8)
Recommended primary annotation: Probable glycosaminoglycan xylosylkinase; FAM20B-like secretory-pathway glycan kinase.
Probable substrate: Galβ1–4Xyl-containing intermediates in the common HS/CS proteoglycan linkage region, with phosphorylation of xylose at O2.
Probable compartment: lumenal ER–Golgi secretory pathway, with direct tagged-protein evidence for ER/Golgi distribution and intracellular retention.
Probable pathway role: acceleration and quality control of proteoglycan linker completion and initiation of both HS and CS chains; no evidence that CG3631 directly controls later backbone polymerization or independently selects HS versus CS.
Overall confidence: high for identity and FAM20B-family assignment; moderate-to-high for predicted reaction and substrate class; moderate for secretory-pathway localization; low for specific endogenous substrates, signaling phenotypes, and quantitative effects because these remain untested directly in CG3631.
References
(ishikawa2012therainesyndrome pages 2-3): Hiroyuki O. Ishikawa, Aiguo Xu, Eri Ogura, Gerard Manning, and Kenneth D. Irvine. The raine syndrome protein fam20c is a golgi kinase that phosphorylates bio-mineralization proteins. PLoS ONE, 7:e42988, Aug 2012. URL: https://doi.org/10.1371/journal.pone.0042988, doi:10.1371/journal.pone.0042988. This article has 186 citations and is from a peer-reviewed journal.
(zhang2018structureandevolution pages 8-9): Hui Zhang, Qinyu Zhu, Jixin Cui, Yuxin Wang, Mark J. Chen, Xing Guo, Vincent S. Tagliabracci, Jack E. Dixon, and Junyu Xiao. Structure and evolution of the fam20 kinases. Nature Communications, Mar 2018. URL: https://doi.org/10.1038/s41467-018-03615-z, doi:10.1038/s41467-018-03615-z. This article has 86 citations and is from a highest quality peer-reviewed journal.
(zhang2018structureandevolution pages 9-10): Hui Zhang, Qinyu Zhu, Jixin Cui, Yuxin Wang, Mark J. Chen, Xing Guo, Vincent S. Tagliabracci, Jack E. Dixon, and Junyu Xiao. Structure and evolution of the fam20 kinases. Nature Communications, Mar 2018. URL: https://doi.org/10.1038/s41467-018-03615-z, doi:10.1038/s41467-018-03615-z. This article has 86 citations and is from a highest quality peer-reviewed journal.
(worby2021theabcsof pages 1-2): Carolyn A. Worby, Joshua E. Mayfield, Adam J. Pollak, Jack E. Dixon, and Sourav Banerjee. The abcs of the atypical fam20 secretory pathway kinases. The Journal of Biological Chemistry, 296:100267, Jan 2021. URL: https://doi.org/10.1016/j.jbc.2021.100267, doi:10.1016/j.jbc.2021.100267. This article has 42 citations.
(ishikawa2012therainesyndrome pages 7-8): Hiroyuki O. Ishikawa, Aiguo Xu, Eri Ogura, Gerard Manning, and Kenneth D. Irvine. The raine syndrome protein fam20c is a golgi kinase that phosphorylates bio-mineralization proteins. PLoS ONE, 7:e42988, Aug 2012. URL: https://doi.org/10.1371/journal.pone.0042988, doi:10.1371/journal.pone.0042988. This article has 186 citations and is from a peer-reviewed journal.
(sammon2023molecularmechanismof pages 1-3): Douglas Sammon, Anja Krueger, Marta Busse-Wicher, Rhodri Marc Morgan, Stuart M Haslam, Benjamin Schumann, David C Briggs, and Erhard Hohenester. Molecular mechanism of decision-making in glycosaminoglycan biosynthesis. Nature Communications, Oct 2023. URL: https://doi.org/10.1038/s41467-023-42236-z, doi:10.1038/s41467-023-42236-z. This article has 51 citations and is from a highest quality peer-reviewed journal.
(zhang2018structureandevolution pages 1-2): Hui Zhang, Qinyu Zhu, Jixin Cui, Yuxin Wang, Mark J. Chen, Xing Guo, Vincent S. Tagliabracci, Jack E. Dixon, and Junyu Xiao. Structure and evolution of the fam20 kinases. Nature Communications, Mar 2018. URL: https://doi.org/10.1038/s41467-018-03615-z, doi:10.1038/s41467-018-03615-z. This article has 86 citations and is from a highest quality peer-reviewed journal.
(lin2025recentadvancesin pages 2-3): Po‐han Lin and Xuefei Huang. Recent advances in enzymes and chemoenzymatic synthesis of tetrasaccharide linkage region of proteoglycans. May 2025. URL: https://doi.org/10.1002/cbic.202500095, doi:10.1002/cbic.202500095. This article has 3 citations and is from a peer-reviewed journal.
(zhang2018structureandevolution pages 6-7): Hui Zhang, Qinyu Zhu, Jixin Cui, Yuxin Wang, Mark J. Chen, Xing Guo, Vincent S. Tagliabracci, Jack E. Dixon, and Junyu Xiao. Structure and evolution of the fam20 kinases. Nature Communications, Mar 2018. URL: https://doi.org/10.1038/s41467-018-03615-z, doi:10.1038/s41467-018-03615-z. This article has 86 citations and is from a highest quality peer-reviewed journal.
(zhang2018structureandevolution pages 7-8): Hui Zhang, Qinyu Zhu, Jixin Cui, Yuxin Wang, Mark J. Chen, Xing Guo, Vincent S. Tagliabracci, Jack E. Dixon, and Junyu Xiao. Structure and evolution of the fam20 kinases. Nature Communications, Mar 2018. URL: https://doi.org/10.1038/s41467-018-03615-z, doi:10.1038/s41467-018-03615-z. This article has 86 citations and is from a highest quality peer-reviewed journal.
(sammon2023molecularmechanismof pages 7-8): Douglas Sammon, Anja Krueger, Marta Busse-Wicher, Rhodri Marc Morgan, Stuart M Haslam, Benjamin Schumann, David C Briggs, and Erhard Hohenester. Molecular mechanism of decision-making in glycosaminoglycan biosynthesis. Nature Communications, Oct 2023. URL: https://doi.org/10.1038/s41467-023-42236-z, doi:10.1038/s41467-023-42236-z. This article has 51 citations and is from a highest quality peer-reviewed journal.
(sammon2023molecularmechanismof pages 6-7): Douglas Sammon, Anja Krueger, Marta Busse-Wicher, Rhodri Marc Morgan, Stuart M Haslam, Benjamin Schumann, David C Briggs, and Erhard Hohenester. Molecular mechanism of decision-making in glycosaminoglycan biosynthesis. Nature Communications, Oct 2023. URL: https://doi.org/10.1038/s41467-023-42236-z, doi:10.1038/s41467-023-42236-z. This article has 51 citations and is from a highest quality peer-reviewed journal.
(takemura2020chondroitinsulfateproteoglycan pages 1-2): Masahiko Takemura, Fredrik Noborn, Jonas Nilsson, Nanako Bowden, Eriko Nakato, Sarah Baker, Tsu-Yi Su, Göran Larson, and Hiroshi Nakato. Chondroitin sulfate proteoglycan windpipe modulates hedgehog signaling indrosophila. Apr 2020. URL: https://doi.org/10.1091/mbc.e19-06-0327, doi:10.1091/mbc.e19-06-0327. This article has 26 citations and is from a domain leading peer-reviewed journal.
(lin2025recentadvancesin pages 3-4): Po‐han Lin and Xuefei Huang. Recent advances in enzymes and chemoenzymatic synthesis of tetrasaccharide linkage region of proteoglycans. May 2025. URL: https://doi.org/10.1002/cbic.202500095, doi:10.1002/cbic.202500095. This article has 3 citations and is from a peer-reviewed journal.
(koike2014identificationofphosphatase pages 13-14): Toshiyasu Koike, Tomomi Izumikawa, Ban Sato, and Hiroshi Kitagawa. Identification of phosphatase that dephosphorylates xylose in the glycosaminoglycan-protein linkage region of proteoglycans. Mar 2014. URL: https://doi.org/10.1074/jbc.m113.520536, doi:10.1074/jbc.m113.520536. This article has 103 citations and is from a domain leading peer-reviewed journal.
(koike2022alteredsulfationstatus pages 1-2): Toshiyasu Koike, Tadahisa Mikami, Jun-Ichi Tamura, and Hiroshi Kitagawa. Altered sulfation status of fam20c-dependent chondroitin sulfate is associated with osteosclerotic bone dysplasia. Dec 2022. URL: https://doi.org/10.1038/s41467-022-35687-3, doi:10.1038/s41467-022-35687-3. This article has 16 citations and is from a highest quality peer-reviewed journal.
(lin2025recentadvancesin pages 5-5): Po‐han Lin and Xuefei Huang. Recent advances in enzymes and chemoenzymatic synthesis of tetrasaccharide linkage region of proteoglycans. May 2025. URL: https://doi.org/10.1002/cbic.202500095, doi:10.1002/cbic.202500095. This article has 3 citations and is from a peer-reviewed journal.