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ABSTRACT: CKAP2 plays crucial roles in proper chromosome segregation and maintaining genomic stability. CKAP2 protein showed cell-cycle-dependent expression, which reached a maximum level at the G2/M phase and disappeared at the onset of G1 phase. To elucidate the mechanisms underlying cell cycle-dependent expression of CKAP2, we cloned and analyzed the human CKAP2 promoter. The upstream 115-bp region from the transcription start site was sufficient for minimal CKAP2 promoter activity. We identified 2 regulatory sequences; a CHR (-110 to -104 bp) and a GC box (-41 to -32 bp). We confirmed Sp1 bound to the GC box using a supershift assay and a ChIP assay. Mutation in the GC box resulted in a near complete loss of CKAP2 promoter activity while mutation in the CHR decreased the promoter activity by 50%. The CHR mutation showed enhanced activity at the G1/S phase, but still retained cyclic activity. The Chromatin IP revealed that the amount of Sp1 bound to the GC box gradually increased and reached a maximum level at the G2/M phase. The amount of Sp1 bound to the GC box was greatly reduced when Cyclin A was depleted, which was restored by adding Cyclin A/Cdk2 complex back into the nuclear extracts. Together, we concluded that the GC box was responsible for the cyclic activity of human CKAP2 promoter through the phosphorylation of Sp1, possibly by Cyclin A/Cdk complex.
Biochemical and Biophysical Research Communications 03/2012; 420(4):822-7. · 2.48 Impact Factor
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Han-Seong Kim,
Yong-Bock Choi,
Jung-Hwa Lee,
Seong-Yeol Park,
Hyun-Kyoung Kim,
Jae-Soo Koh,
Sang-Yeop Yi,
Kyung-Tae Kim,
Kyung-Uk Hong,
Joobae Park,
Chang-Dae Bae, Kyeong-Man Hong
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ABSTRACT: Proliferation activity has long been known to be one of the strongest prognostic factors in many different cancers. Nevertheless, microscopic evaluation of mitotic figures remains time-consuming and, furthermore, is relatively subjective. As the expression of cytoskeleton-associated protein 2 (CKAP2) is closely related to the mitotic phase, CKAP2 was evaluated as a surrogate mitotic figure (MF) marker.
A monoclonal antibody specific to human CKAP2 was produced, and immunohistochemistry was performed on normal tissue array sections and 30 breast cancer tissues.
The expression of CKAP2 in the normal human tissues was limited to well-known cell proliferation zones. Strong, readily visible, condensed chromatin staining of CKAP2 was observed specifically in mitotic cells, and the number of these cells was tightly correlated with the MF count in breast cancer tissues (P < 0.001, ρ = 0.743), suggesting its usefulness as a surrogate marker for MF counting.
Immunohistochemical staining with CKAP2 monoclonal antibody can be considered to be a new, effective approach to the assessment of proliferation activity in cancer tissues.
Journal of Cancer Research and Clinical Oncology 01/2012; 138(1):95-102. · 2.56 Impact Factor
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Chang-Min Choi,
Se-Jin Jang,
Seong-Yeol Park,
Yong-Bock Choi,
Jae-Heon Jeong,
Dae-Seok Kim,
Hyun-Kyoung Kim,
Kang-Seo Park,
Byung-Ho Nam,
Hyeong-Ryul Kim,
Soo-Youl Kim, Kyeong-Man Hong
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ABSTRACT: Expression of transglutaminase 2 (TGase 2) is related to invasion and resistance to chemotherapeutic agents in several cancer cells. However, there has been only limited clinical validation of TGase 2 as an independent prognostic marker in cancer.
The significance of TGase 2 expression as an invasive/migratory factor was addressed by in vitro assays employing down-regulation of TGase 2. TGase 2 expression as a prognostic indicator was assessed in 429 Korean patients with early-stage non-small cell lung cancer (NSCLC) by immunohistochemical staining.
TGase 2 expression increased the invasive and migratory properties of NSCLC cells in vitro, which might be related to the induction of MMP-9. In the analysis of the immunohistochemical staining, TGase 2 expression in tumors was significantly correlated with recurrence in NSCLC (p = 0.005) or in the non-adenocarcinoma subtype (p = 0.031). Additionally, a multivariate analysis also showed a significant correlation between strong TGase 2 expression and shorter disease-free survival (DFS) in NSCLC (p = 0.029 and HR = 1.554) and in the non-adenocarcinoma subtype (p = 0.030 and HR = 2.184). However, the correlation in the adenocarcinoma subtype was not significant.
TGase 2 expression was significantly correlated with recurrence and shorter DFS in NSCLC, especially in the non-adenocarcinoma subtype including squamous cell carcinoma.
Molecular Cancer 09/2011; 10:119. · 3.99 Impact Factor
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Sun-Young Joo,
Kyung-Ah Cho,
Yun-Jae Jung,
Han-Seong Kim,
Seong-Yeol Park,
Yong-Bock Choi, Kyeong-Man Hong,
So-Youn Woo,
Ju-Young Seoh,
Su Jin Cho,
Kyung-Ha Ryu
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ABSTRACT: Graft-versus-host disease (GvHD) remains a major complication after allogeneic hematopoietic cell transplantation (HCT). Recent literature demonstrates a potential benefit of human mesenchymal stromal cells (MSC) for the treatment of refractory GvHD; however, the optimal dose remains uncertain. We set out to develop an animal model that can be used to study the effect of MSC on GvHD.
A GvHD mouse model was established by transplanting C3H/he donor bone marrow (BM) cells and spleen cells into lethally irradiated BALB/c recipient mice. MSC were obtained from C3H/he mice and the C3H/10T1/2 murine MSC line.
The mRNA expression of Foxp3 in regional lymph nodes (LN) localized with T cells was markedly increased by the addition of C3H10T1/2 cells in a real-time polymerase chain reaction (PCR). Using a mixed lymphocyte reaction, we determined the optimal splenocyte proliferation inhibition dose (MSC:splenocyte ratios 1:2 and 1:1). Three different C3H10T1/2 cell doses (low, 0.5 x 10(6), intermediate, 1 x 10(6), and high, 2 x 10(6)) with a consistent splenocyte dose (1 x 10(6)) were evaluated for their therapeutic potential in an in vivo GvHD model. The clinical and histologic GvHD score and Kaplan-Meier survival rate were improved after MSC transplantation, and these results demonstrated a dose-dependent inhibition.
We conclude that MSC inhibit GvHD in a dose-dependent manner in this mouse model and this model can be used to study the effects of MSC on GvHD.
Cytotherapy 05/2010; 12(3):361-70. · 3.63 Impact Factor
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ABSTRACT: Recently, it was reported that expression of transglutaminase 2 plays an important role in doxorubicin/cisplatin resistance in breast and ovarian cancer. The aims of this study were to verify the role of transglutaminase 2 in cisplatin response in non-small cell lung cancer (NSCLC) and to study if transglutaminase 2 gene (TGM2) methylation can be a molecular marker for good response to cisplatin.
TGM2 promoter methylation was analyzed by sodium bisulfite sequencing. Cisplatin sensitivity was analyzed by treatment of cisplatin in NSCLC cell lines with/without TGM2 or TGM2 siRNA transfection.
In one-third of NSCLC cell lines, TGase 2 gene (TGM2) was silenced by promoter methylation. The TGM2 promoter-methylated cell lines (HCC-95 and HCC-1588) showed relatively higher sensitivity to cisplatin than the TGM2-expressing cell lines (NCI-H1299 and HCC-1195). Down-regulation and over-expression of TGM2 in those NSCLC cells also suggested a positive correlation of cisplatin sensitivity and TGM2 inhibition. With doxorubicin, the relationship was quite similar.
We showed that good responders of cisplatin in NSCLC could be identified by the promoter methylation of TGM2 and that TGase 2 inhibition appears to be an effective cisplatin-sensitizing modality in NSCLC.
Journal of Cancer Research and Clinical Oncology 09/2009; 136(4):493-502. · 2.56 Impact Factor
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ABSTRACT: During mitosis, establishment of structurally and functionally sound bipolar spindles is necessary for maintaining the fidelity of chromosome segregation. Tumor-associated microtubule-associated protein (TMAP), also known as cytoskeleton-associated protein 2 (CKAP2), is a mitotic spindle-associated protein whose level is frequently up-regulated in various malignancies. Previous reports have suggested that TMAP is a potential regulator of mitotic spindle assembly and dynamics and that it is required for chromosome segregation to occur properly. So far, there have been no reports on how its mitosis-related functions are regulated. Here, we report that TMAP is hyper-phosphorylated at the C terminus specifically during mitosis. At least four different residues (Thr-578, Thr-596, Thr-622, and Ser-627) were responsible for the mitosis-specific phosphorylation of TMAP. Among these, Thr-622 was specifically phosphorylated by Cdk1-cyclin B1 both in vitro and in vivo. Interestingly, compared with the wild type, a phosphorylation-deficient mutant form of TMAP, in which Thr-622 had been replaced with an alanine (T622A), induced a significant increase in the frequency of metaphase cells with abnormal bipolar spindles, which often displayed disorganized, asymmetrical, or narrow and elongated morphologies. Formation of these abnormal bipolar spindles subsequently resulted in misalignment of metaphase chromosomes and ultimately caused a delay in the entry into anaphase. Moreover, such defects resulting from the T622A mutation were associated with a decrease in the rate of protein turnover at spindle microtubules. These findings suggest that Cdk1-cyclin B1-mediated phosphorylation of TMAP is important for and contributes to proper regulation of microtubule dynamics and establishment of functional bipolar spindles during mitosis.
Journal of Biological Chemistry 05/2009; 284(24):16501-12. · 4.77 Impact Factor
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ABSTRACT: Tumor associated microtubule associated protein (TMAP), also known as cytoskeleton associated protein 2 (CKAP2) is a mitotic spindle-associated protein whose expression is cell cycle-regulated and also frequently deregulated in cancer cells. Two monoclonal antibodies (mAbs) against TMAP/CKAP2 were produced: B-1-13 and D-12-3. Interestingly, the reactivity of mAb D-12-3 to TMAP/CKAP2 was markedly decreased specifically in mitotic cell lysate. The epitope mapping study showed that mAb D-12-3 recognizes the amino acid sequence between 569 and 625 and that phosphorylation at T596 completely abolishes the reactivity of the antibody, suggesting that the differential reactivity originates from the phosphorylation status at T596. Immunofluorescence staining showed that mAb D-12-3 fails to detect TMAP/CKAP2 in mitotic cells between prophase and metaphase, but the staining becomes evident again in anaphase, suggesting that phosphorylation at T596 occurs transiently during early phases of mitosis. These results suggest that the cellular functions of TMAP/CKAP2 might be regulated by timely phosphorylation and dephosphorylation during the course of mitosis.
Experimental and Molecular Medicine 09/2008; 40(4):377-86. · 2.48 Impact Factor
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ABSTRACT: Recently it was shown that single nucleotide polymorphisms (SNPs) can explain individual variation because of the small changes of the gene expression level and that the 50% decreased expression of an allele might even lead to predisposition to cancer. In this study, we found that a decreased expression of an allele might cause predisposition to genetic disease. Dopa responsive dystonia (DRD) is a dominant disease caused by mutations in GCH1 gene. The sequence analysis of the GCH1 in a patient with typical DRD symptoms revealed two novel missense mutations instead of a single dominant mutation. Family members with either of the mutations did not have any symptoms of DRD. The expression level of a R198W mutant allele decreased to about 50%, suggesting that modestly decreased expression caused by an SNP should lead to predisposition of a genetic disease in susceptible individuals.
Experimental and Molecular Medicine 07/2008; 40(3):271-5. · 2.48 Impact Factor
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Kyeong-Man Hong,
Sei-Hoon Yang,
Sinchita Roy Chowdhuri,
Audrey Player,
Megan Hames,
Junya Fukuoka,
Daoud Meerzaman,
Tatiana Dracheva,
Zhifu Sun,
Ping Yang,
Jin Jen
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ABSTRACT: Serial analysis of gene expression studies led us to identify a previously unknown gene, c20orf85, that is present in the normal lung epithelium but absent or downregulated in most primary nonsmall cell lung cancers and lung cancer cell lines. We named this gene LLC1 for Low in Lung Cancer 1. LLC1 is located on chromosome 20q13.3 and has a 70% GC content in the promoter region. It has 4 exons and encodes a protein containing 137 amino acids. By in situ hybridization, we observed that LLC1 message is localized in normal lung bronchial epithelial cells but absent in 13 of 14 lung adenocarcinoma and 9 out of 10 lung squamous carcinoma samples. Methylation at CpG sites of the LLC1 promoter was frequently observed in lung cancer cell lines and in a fraction of primary lung cancer tissues. Treatment with 5-aza deoxycytidine resulted in a reduced methylation of the LLC1 promoter concomitant with the increase of LLC1 expression. These results suggest that inactivation of LLC1 by means of promoter methylation is a frequent event in nonsmall cell lung cancer and may play a role in lung tumorigenesis.
International Journal of Cancer 07/2007; 120(11):2353-8. · 5.44 Impact Factor
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ABSTRACT: The methylation of a 23-kDa nuclear protein increased after partial hepatectomy and methylation returned to basal levels after the initial stage of regeneration. The methylating enzyme was partially purified from rat liver by ammonium sulfate precipitation, DEAE-anion exchange chromatography and Butyl-Sepharose chromatography. The 23-kDa protein was purified from a nuclear fraction of liver tissue with SP-Sepharose. When the 23-kDa protein was methylated with the partially purified methyltransferase and analyzed on C(18) high performance liquid chromatography (HPLC), the methylated acceptor amino acid was monomethyl lysine (MML). Previously, only arginine N-methylation of specific substrate proteins has been reported during liver regeneration. However, in this report, we found that lysine N-methylation increased during early hepatic regeneration, suggesting that lysine N-methylation of the 23-kDa nuclear protein may play a functional role in hepatic regeneration. The methyltransferase did not methylate other proteins such as histones, hnRNPA1, or cytochrome C, suggesting the enzyme is a 23-kDa nuclear protein- specific lysine N-methyltransferase.
Experimental and Molecular Medicine 07/2005; 37(3):155-60. · 2.48 Impact Factor
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BioTechniques 04/2005; 38(3):354, 356, 358. · 2.67 Impact Factor
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Sei Hoon Yang,
Leah E Mechanic,
Ping Yang,
Maria Teresa Landi,
Elise D Bowman,
Jason Wampfler,
Daoud Meerzaman, Kyeong Man Hong,
Felicia Mann,
Tatiana Dracheva,
Junya Fukuoka,
William Travis,
Neil E Caporaso,
Curtis C Harris,
Jin Jen
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ABSTRACT: We evaluated somatic genetic alterations in the kinase domain of the EGFR gene in the tumors of 219 non-small cell lung cancer patients of primarily Caucasian and African American origins. We identified 26 patients (12%) whose tumors had a mutation in the EGFR gene, and 11 (5%) patients carried novel genomic variations consistent with germ-line polymorphisms. All but one mutation were identified in Caucasian patients affected with adenocarcinoma. EGFR mutations were more frequent in women and in nonsmokers, but a significant portion of the affected patients were men (12 of 26) and current or past smokers accounted for half of the patients affected (13 of 26). Screening subjects with EGFR mutations may identify patients whose tumors could respond to targeted therapy using tyrosine kinase inhibitors.
Clinical Cancer Research 04/2005; 11(6):2106-10. · 7.74 Impact Factor
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ABSTRACT: Allele frequencies for the 10 STR loci, D6S1043, D9S925, D7S821, D4S2368, D21S2055, GATA193A07, D12S391, D10S2326, D15S822 and D18S51 were obtained from a sample of 217-310 unrelated Koreans. In this study, 2 out of the 10 loci did not meet Hardy-Weinberg expectation. The combined probability of identity for 10 loci tested was 4.93 x 10(-14).
Forensic Science International 03/2004; 140(1):133-5. · 2.30 Impact Factor
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ABSTRACT: The development of a multiplex polymerase chain reaction (PCR) method for rapid and accurate detection and typing of herpes simplex virus type 1 (HSV-1), and type-2 (HSV-2), cytomegalovirus (CMV) and Epstein-Barr virus (EBV) is very important for clinical diagnosis to allow the deliver of therapy as early as possible. Large scale amplifications by multiplex PCR of viral DNA can lower the cost and time for viral diagnosis. In this study, therefore sensitive quadruplex PCR was achieved by optimizing parameters such as primers, and 1.5 mM magnesium and 200 uM dNTPs concentrations. The concentrations of HSV-1, HSV-2, CMV and EBV primers were 0.5, 0.3, 0.25 and 0.25 pmoles, respectively. Optimal annealing temperature was 54 degrees C. Employing these conditions, we could detect 10 copies of reconstructed template plasmid DNA, which were cloned to vectors containing target sequences of viral DNA. PCR products of 271 bp for HSV-1, 231 bp for HSV-2, 368 bp for CMV, and 326 bp for EBV were separated on 5.0% polyacrylamide gel electrophoresis and confirmed by direct sequencing. The present study showed that the quadruplex PCR assay described herein has potential application in clinical diagnosis, when rapid, accurate detection and typing of viruses HSV-1, HSV-2, CMV or EBV are necessary.
Yonsei Medical Journal 01/2004; 44(6):1001-7. · 1.14 Impact Factor
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Audrey Player,
John Gillespie,
Takeshi Fujii,
Junya Fukuoka,
Tatiana Dracheva,
Dauod Meerzaman, Kyeong Man Hong,
John Curran,
Goziam Attoh,
William Travis,
Jin Jen
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ABSTRACT: TDE2, a gene with sequence similarity to the mouse testicular tumor-differentially-expressed (Tde1/MUSTETU) gene, was identified by serial analysis of gene expression (SAGE) in nonsmall cell lung cancers (NSCLC). Here we characterized the TDE2 gene and determined its transcript levels in a panel of lung tumors, adjacent nonmalignant lung tissues and a variety of normal human tissues. In addition, we show that TDE2 is a potential transmembrane protein with 11 putative transmembrane helices. Using real-time quantitative PCR, we showed that TDE2 transcript levels were higher in NSCLC compared to nonmalignant samples. In nonpulmonary normal tissues, the level of TDE2 was the highest in bladder, kidney and muscle; moderate to low in stomach, liver, skin, placenta and ovary tissues; and undetectable in brain, spleen and heart. By in situ hybridization, we showed that 10 of 18 lung tumors and only 1 of 14 adjacent nonmalignant regions had high levels of TDE2 transcripts. Alternatively, only 2 of 18 tumors and 8 of 14 adjacent nonmalignant bronchiole epithelium regions demonstrated negative to low levels of TDE2 signals.
International Journal of Cancer 12/2003; 107(2):238-43. · 5.44 Impact Factor
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ABSTRACT: Systemic lupus erythematosus (SLE) is characterized by the presence of various autoantibodies and the deposition of immune complex, which is cleared by Fcgamma receptors. Genotype analysis was done to investigate whether the FcgammaRIIIA-176F/V polymorphism is a risk factor for SLE in Koreans. We genotyped 145 Korean SLE patients and 75 control subjects for FcgammaRIIIA-176F/ V. After amplifying a 1.7-kb fragment containing the Fcgamma/RIIIA-176F/V polymorphic site using two FcgammaRIIIA gene-specific primers, we performed a nested polymerase chain reaction (PCR) for allele-specific genotyping at position 559 in FcgammaRIIIA. FcgammaRIIIA genotype or allele distribution was not significantly different between lupus patients and controls, and also between lupus nephritis patients and healthy controls. Neither creatinine clearance, 24 h urine proteinuria, number of American College of Rheumatology (ACR) criteria, nor the Systemic Lupus International Collaborating Clinics (SLICC)/ACR damage index was different according to the genotype. In conclusion, FcgammaRIIIA-176F/V polymorphism is not associated with SLE in Koreans.
Rheumatology International 05/2002; 21(6):222-6. · 1.88 Impact Factor
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ABSTRACT: Anti-double stranded(ds) DNA antibody is one of markers of systemic lupus erythematosus (SLE). Two human monoclonal anti-DNA
antibody – producing cell lines were established from two SLE patients. One cell line secreted IgG isotype antibody (KSUG)
and the other secreted IgM isotype antibody (KSUN). The light chains of the two immunoglobulins were lambda chains. The nucleotide
sequences for the immunoglobulin variable region genes of the two antibodies were determined and compared to germline sequences.
The heavy and lambda light chains of KSUG were VH3 family and V λ IIIb, respectively. The heavy and lambda light chains of KSUN were VH4 family and V λ IX, respectively. Antibody KSUG, IgG isotype, showed somatic mutations, whereas KSUN, IgM isotype, used the germline gene
without mutation. These findings reconfirm the current paradigms that IgM anti-DNA antibodies are produced by utilizing germline
genes whereas IgG anti-DNA antibodies are produced by somatic mutations.
Rheumatology International 01/1998; 17(6):223-228. · 1.88 Impact Factor
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ABSTRACT: We evaluated the effect of paclitaxel on the severity of autoimmunity in the murine model of systemic lupus erythematosus (SLE), NZB×NZW F1 mice. Fifteen 20 week old (NZB×NZW) F1 female mice were given a dose of 10 mg⧹kg paclitaxel by the intraperitoneal route on three alternate days followed by 7.5 mg⧹kg on three additional alternate days. This pattern of treatment was repeated every 4 weeks for a period of 28 weeks. 20 control mice were injected intraperitoneally with an equal volume of the vehicle used. Serum anti-double stranded DNA (dsDNA) antibody titers and the blood urea nitrogen (BUN) were significantly diminished in the paclitaxel treated group compared to the vehicle treated group. While the onset of proteinuria appeared to be delayed in the experimental group, the difference was not significant. Survival rate improved significantly in paclitaxel treated group (p=0.04 by log-rank test). These results suggest that paclitaxel is beneficial in the suppression of autoimmunity in this strain of mice by reducing the anti-dsDNA antibody titer and the BUN, prolonging survival.
International Journal of Immunopharmacology.
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ABSTRACT: Three new members of the cysteine proteinase gene family of Paragonimus westermani have been isolated and classified. Comparisons of the predicted amino acid sequences of PwCP2 (U69121), PwCP4 (U56958), and PwCP5 (U33215) were performed with those of the previously reported PwCP1 (U69120) and PwCP3 (U56865) sequence. The amino acid alignment showed conservation of the cysteine, histidine, and asparagine residue that form the catalytic triad. With 57 cysteine proteinases including PwCP1-5, we conducted phylogenetic analysis using neighbor joining method (NJ). A resultant unrooted tree revealed that PwCP1-5 were clustered with cruzipain-like or cathepsin L-like cysteine proteinases. More detailed phylogenetic analyses with a reduced alignment set (22 cysteine proteinases) were performed by NJ and maximum parsimony (MP) methods. The results showed coincidently that PwCP1, 2, 3, and 4 belonged to the group of previously reported cruzipain-like cysteine proteinases (bootstrapping values of 97 and 100% in the MP and NJ trees) but PwCP5 to cathepsin L-like cysteine proteinases (the value of 76 and 100% in MP and NJ trees). Within the cruzipain-like clade, PwCP2 and 4 were found to be the most closely related. PwCP 2, 3, and 4 have five of six cruzipain signature sequences known previously, whereas PwCP5 do not have any cruzipain sequences in the corresponding sites. We found that two signature candidate sites (Gly 174, Asn 175--human cathepsin L numbering) for cathepsin L-like group are conserved in PwCP5, which are conserved within cathepsin L-like group and also different from those of cruzipain and other cysteine proteinase groups. PwCP5 has three-residue insertion (hydrophilic residues, Ser-Tyr-Gly) within the position corresponding to S3 subsite of SmCL2. Compared to the two-residue insertion (Tyr-Gly) in SmCL2, the three-residue insertion appeared in PwCP5 may bring bigger difference in substrate specificity between PwCP1-4 (cruzipain) and PwCP5 (cathepsin L-like). Such presumption is quite plausible considering extremely lower amino acid sequence similarity (18.2%) between PwCP1-4 and PwCP5. The present study is worthy of reporting one another case, the third organism after Schistosoma mansoni and Schistosoma japonicum, which has the two kinds of genes encoding both the cruzipain and cathepsin L-like cysteine proteinases. In addition, the fact that most of cysteine proteinases from P. westermani are cruzipain-like type implies strongly that a new powerful drug for paragonimiasis could be designed and developed if we focus on the exploration of anti-agents against P. westermani cruzipain-like cysteine proteinases.
Experimental Parasitology 102(3-4):143-9. · 2.12 Impact Factor
