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FAXC_PSETE Reviewed; 467 AA.
Q56VR3; A5X463; Q6IT09; Q6IT10;
31-MAY-2011, integrated into UniProtKB/Swiss-Prot.
28-JUN-2011, sequence version 2.
02-JUN-2021, entry version 109.
RecName: Full=Venom prothrombin activator pseutarin-C catalytic subunit;
Short=PCCS;
Short=vPA;
EC=3.4.21.6 {ECO:0000269|PubMed:12362232, ECO:0000269|PubMed:23869089};
AltName: Full=Venom coagulation factor Xa-like protease;
Contains:
RecName: Full=Pseutarin-C catalytic subunit light chain;
Contains:
RecName: Full=Pseutarin-C catalytic subunit heavy chain;
Flags: Precursor;
Pseudonaja textilis (Eastern brown snake).
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
Serpentes; Colubroidea; Elapidae; Acanthophiinae; Pseudonaja.
NCBI_TaxID=8673;
[1]
NUCLEOTIDE SEQUENCE [GENOMIC DNA / MRNA], PROTEIN SEQUENCE OF 41-70;
77-119; 142-177; 210-242 AND 271-281, TOXIC DOSE, GLYCOSYLATION AT SER-92
AND ASN-254, AND IDENTIFICATION BY MASS SPECTROMETRY.
TISSUE=Venom gland;
PubMed=15351847; DOI=10.1160/th04-03-0144;
Rao V.S., Swarup S., Kini R.M.;
"The catalytic subunit of pseutarin C, a group C prothrombin activator from
the venom of Pseudonaja textilis, is structurally similar to mammalian
blood coagulation factor Xa.";
Thromb. Haemost. 92:509-521(2004).
[2]
NUCLEOTIDE SEQUENCE [MRNA].
TISSUE=Venom gland;
PubMed=16197456; DOI=10.1111/j.1365-2141.2005.05744.x;
Filippovich I., Sorokina N., St Pierre L., Flight S., de Jersey J.,
Perry N., Masci P.P., Lavin M.F.;
"Cloning and functional expression of venom prothrombin activator protease
from Pseudonaja textilis with whole blood procoagulant activity.";
Br. J. Haematol. 131:237-246(2005).
[3]
NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 1-17.
PubMed=17239167; DOI=10.1111/j.1538-7836.2006.02266.x;
Reza M.A., Swarup S., Kini R.M.;
"Structure of two genes encoding parallel prothrombin activators in
Tropidechis carinatus snake: gene duplication and recruitment of factor X
gene to the venom gland.";
J. Thromb. Haemost. 5:117-126(2007).
[4]
PROTEIN SEQUENCE OF 41-70 AND 210-246, FUNCTION, CATALYTIC ACTIVITY,
ACTIVITY REGULATION, SUBUNIT, SUBCELLULAR LOCATION, TISSUE SPECIFICITY, AND
GAMMA-CARBOXYGLUTAMATION AT GLU-46; GLU-47; GLU-54; GLU-56; GLU-59; GLU-60;
GLU-65 AND GLU-66.
TISSUE=Venom;
PubMed=12362232; DOI=10.1267/th02100611;
Rao V.S., Kini R.M.;
"Pseutarin C, a prothrombin activator from Pseudonaja textilis venom: its
structural and functional similarity to mammalian coagulation factor Xa-Va
complex.";
Thromb. Haemost. 88:611-619(2002).
[5]
TOXIC DOSE, SUBUNIT, SUBCELLULAR LOCATION, AND TISSUE SPECIFICITY.
STRAIN=Pseudonaja textilis textilis; TISSUE=Venom;
PubMed=3075905;
Masci P.P., Whitaker A.N., de Jersey J.;
"Purification and characterization of a prothrombin activator from the
venom of the Australian brown snake, Pseudonaja textilis textilis.";
Biochem. Int. 17:825-835(1988).
[6]
NOMENCLATURE.
PubMed=11522026;
Manjunatha Kini R., Morita T., Rosing J.;
"Classification and nomenclature of prothrombin activators isolated from
snake venoms.";
Thromb. Haemost. 86:710-711(2001).
[7]
PHARMACEUTICAL.
PubMed=21184772; DOI=10.1016/j.toxicon.2010.12.010;
Earl S.T., Masci P.P., de Jersey J., Lavin M.F., Dixon J.;
"Drug development from Australian elapid snake venoms and the Venomics
pipeline of candidates for haemostasis: Textilinin-1 (Q8008), Haempatch
(Q8009) and CoVase (V0801).";
Toxicon 59:456-463(2012).
[8] {ECO:0007744|PDB:4BXS, ECO:0007744|PDB:4BXW}
X-RAY CRYSTALLOGRAPHY (2.71 ANGSTROMS) OF 41-463 IN COMPLEX WITH
PSEUTARIN-C NON-CATALYTIC SUBUNIT, DISULFIDE BONDS, FUNCTION, AND CATALYTIC
ACTIVITY.
PubMed=23869089; DOI=10.1182/blood-2013-06-511733;
Lechtenberg B.C., Murray-Rust T.A., Johnson D.J., Adams T.E.,
Krishnaswamy S., Camire R.M., Huntington J.A.;
"Crystal structure of the prothrombinase complex from the venom of
Pseudonaja textilis.";
Blood 122:2777-2783(2013).
-!- FUNCTION: Snake prothrombin activator that attacks the hemostatic
system of prey. This non-catalytic subunit is functionally similar to
blood coagulation factor V (PubMed:12362232, PubMed:23869089). It
serves as a critical cofactor for the prothrombinase activity of the
catalytic subunit, which is similar to the blood coagulation factor X
(PubMed:12362232, PubMed:23869089). The complex converts prothrombin to
thrombin by sequential cleavage at two positions, Arg-320 followed by
Arg-271 (PubMed:23869089). Cleavage at Arg-320 produces an active
intermediate known as meizothrombin (PubMed:23869089). Meizothrombin is
the 'second' substrate for prothrombinase, and it docks in an altered
manner to present the second cleavage site (271) (PubMed:23869089).
Cleavage at Arg-271 releases active thrombin from its pro-fragment
(PubMed:23869089). This order of events is reversed if the protease
component of prothrombinase is used on its own, suggesting that the 271
site is inherently more accessible to proteolysis (PubMed:23869089).
The complex converts prothrombin to thrombin in presence but also in
the absence of membrane (PubMed:23869089).
{ECO:0000269|PubMed:12362232, ECO:0000269|PubMed:23869089}.
-!- CATALYTIC ACTIVITY:
Reaction=Selective cleavage of Arg-|-Thr and then Arg-|-Ile bonds in
prothrombin to form thrombin.; EC=3.4.21.6;
Evidence={ECO:0000269|PubMed:12362232, ECO:0000269|PubMed:23869089};
-!- ACTIVITY REGULATION: Activated by calcium and negatively charged
phospholipids. {ECO:0000269|PubMed:12362232,
ECO:0000269|PubMed:23869089}.
-!- SUBUNIT: Heterodimer of a light and a heavy chains; disulfide-linked.
Is associated with pseutarin-C non-catalytic subunit (AC Q7SZN0) in a
non-covalent manner. {ECO:0000269|PubMed:12362232,
ECO:0000269|PubMed:23869089, ECO:0000269|PubMed:3075905}.
-!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:12362232,
ECO:0000269|PubMed:3075905}.
-!- TISSUE SPECIFICITY: Expressed by the venom gland.
{ECO:0000269|PubMed:12362232, ECO:0000269|PubMed:3075905}.
-!- PTM: Gamma-carboxyglutamate residues are formed by vitamin K dependent
carboxylation. These residues are essential for the binding of calcium.
{ECO:0000255|PROSITE-ProRule:PRU00463, ECO:0000269|PubMed:12362232}.
-!- TOXIC DOSE: Intravenous injection (23 ug/kg bodyweight) of the group C
prothrombin activator causes death in rats through disseminated
intravascular coagulopathy (PubMed:3075905), whereas pseutarin-C is not
lethal even at 10 mg/kg in mice when injected intraperitoneally
(PubMed:15351847). {ECO:0000269|PubMed:15351847,
ECO:0000269|PubMed:3075905}.
-!- PHARMACEUTICAL: Is under preclinical trial by the Australian
biopharmaceutical company QRxPharma Ltd, its subsidiary Venomics Pty
Ltd (VPL) and the University of Queensland (UQ) under the name
Haempatch (Q8009). Tested as a topical hemostatic agent to reduce blood
loss resulting from surgery or trauma.
-!- MISCELLANEOUS: Is classified in the group C of snake venom prothrombin
activators, since it does not require the mammalian factor Va for the
cleavage of prothrombin as the venom contains its own non-catalytic
factor Va-like molecule. {ECO:0000305|PubMed:21184772}.
-!- MISCELLANEOUS: In contrast to blood coagulation factors that circulate
as inactive zymogen in plasma, venom prothrombin activators are always
found in the active form in the venom. Hence, catalytic and non-
catalytic subunits are found naturally in venom as stable complexes.
-!- SIMILARITY: Belongs to the peptidase S1 family. Snake venom subfamily.
{ECO:0000255|PROSITE-ProRule:PRU00274}.
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EMBL; AY260939; AAP86642.1; -; mRNA.
EMBL; AY631239; AAT42491.1; -; mRNA.
EMBL; DQ533835; ABG02407.1; -; Genomic_DNA.
EMBL; AY631238; AAT42490.1; -; mRNA.
PDB; 4BXS; X-ray; 3.32 A; A=41-463.
PDB; 4BXW; X-ray; 2.71 A; A/B=41-463.
PDBsum; 4BXS; -.
PDBsum; 4BXW; -.
SMR; Q56VR3; -.
MEROPS; S01.446; -.
iPTMnet; Q56VR3; -.
BRENDA; 3.4.21.60; 6821.
Proteomes; UP000472273; Unplaced.
GO; GO:0005576; C:extracellular region; IDA:UniProtKB.
GO; GO:0032991; C:protein-containing complex; IDA:UniProtKB.
GO; GO:0005509; F:calcium ion binding; IEA:InterPro.
GO; GO:0016504; F:peptidase activator activity; IEA:UniProtKB-KW.
GO; GO:0004252; F:serine-type endopeptidase activity; IDA:UniProtKB.
GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
GO; GO:0007596; P:blood coagulation; IEA:InterPro.
GO; GO:0044469; P:envenomation resulting in positive regulation of blood coagulation in other organism; IDA:UniProtKB.
GO; GO:0035807; P:positive regulation of blood coagulation in other organism; IDA:UniProtKB.
CDD; cd00190; Tryp_SPc; 1.
Gene3D; 2.40.10.10; -; 2.
Gene3D; 4.10.740.10; -; 1.
InterPro; IPR017857; Coagulation_fac-like_Gla_dom.
InterPro; IPR001881; EGF-like_Ca-bd_dom.
InterPro; IPR000742; EGF-like_dom.
InterPro; IPR000152; EGF-type_Asp/Asn_hydroxyl_site.
InterPro; IPR018097; EGF_Ca-bd_CS.
InterPro; IPR035972; GLA-like_dom_SF.
InterPro; IPR000294; GLA_domain.
InterPro; IPR009030; Growth_fac_rcpt_cys_sf.
InterPro; IPR012224; Pept_S1A_FX.
InterPro; IPR009003; Peptidase_S1_PA.
InterPro; IPR043504; Peptidase_S1_PA_chymotrypsin.
InterPro; IPR001314; Peptidase_S1A.
InterPro; IPR001254; Trypsin_dom.
InterPro; IPR018114; TRYPSIN_HIS.
InterPro; IPR033116; TRYPSIN_SER.
Pfam; PF00008; EGF; 1.
Pfam; PF00594; Gla; 1.
Pfam; PF00089; Trypsin; 1.
PIRSF; PIRSF001143; Factor_X; 1.
PRINTS; PR00722; CHYMOTRYPSIN.
PRINTS; PR00001; GLABLOOD.
SMART; SM00181; EGF; 2.
SMART; SM00179; EGF_CA; 1.
SMART; SM00069; GLA; 1.
SMART; SM00020; Tryp_SPc; 1.
SUPFAM; SSF50494; SSF50494; 1.
SUPFAM; SSF57184; SSF57184; 1.
SUPFAM; SSF57630; SSF57630; 1.
PROSITE; PS00010; ASX_HYDROXYL; 1.
PROSITE; PS00022; EGF_1; 1.
PROSITE; PS01186; EGF_2; 2.
PROSITE; PS50026; EGF_3; 1.
PROSITE; PS01187; EGF_CA; 1.
PROSITE; PS00011; GLA_1; 1.
PROSITE; PS50998; GLA_2; 1.
PROSITE; PS50240; TRYPSIN_DOM; 1.
PROSITE; PS00134; TRYPSIN_HIS; 1.
PROSITE; PS00135; TRYPSIN_SER; 1.
1: Evidence at protein level;
3D-structure; Blood coagulation cascade activating toxin; Calcium;
Cleavage on pair of basic residues; Direct protein sequencing;
Disulfide bond; EGF-like domain; Gamma-carboxyglutamic acid; Glycoprotein;
Hemostasis impairing toxin; Hydrolase; Pharmaceutical; Protease;
Prothrombin activator; Reference proteome; Repeat; Secreted;
Serine protease; Signal; Toxin.
SIGNAL 1..22
/evidence="ECO:0000255"
PROPEP 23..40
/evidence="ECO:0000269|PubMed:12362232,
ECO:0000269|PubMed:15351847"
/id="PRO_0000408523"
CHAIN 41..181
/note="Pseutarin-C catalytic subunit light chain"
/id="PRO_5000090539"
PROPEP 182..209
/note="Activation peptide"
/evidence="ECO:0000250"
/id="PRO_0000408525"
CHAIN 210..467
/note="Pseutarin-C catalytic subunit heavy chain"
/id="PRO_0000408526"
DOMAIN 41..86
/note="Gla"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00463"
DOMAIN 86..122
/note="EGF-like 1; calcium-binding"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00076"
DOMAIN 129..164
/note="EGF-like 2"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00076"
DOMAIN 210..454
/note="Peptidase S1"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00274"
ACT_SITE 251
/note="Charge relay system"
/evidence="ECO:0000250"
ACT_SITE 309
/note="Charge relay system"
/evidence="ECO:0000250"
ACT_SITE 406
/note="Charge relay system"
/evidence="ECO:0000250"
SITE 75
/note="Not modified"
/evidence="ECO:0000305"
SITE 103
/note="Not modified"
SITE 209..210
/note="Cleavage"
MOD_RES 46
/note="4-carboxyglutamate"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00463,
ECO:0000269|PubMed:12362232"
MOD_RES 47
/note="4-carboxyglutamate"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00463,
ECO:0000269|PubMed:12362232"
MOD_RES 54
/note="4-carboxyglutamate"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00463,
ECO:0000269|PubMed:12362232"
MOD_RES 56
/note="4-carboxyglutamate"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00463,
ECO:0000269|PubMed:12362232"
MOD_RES 59
/note="4-carboxyglutamate"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00463,
ECO:0000269|PubMed:12362232"
MOD_RES 60
/note="4-carboxyglutamate"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00463,
ECO:0000269|PubMed:12362232"
MOD_RES 65
/note="4-carboxyglutamate"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00463,
ECO:0000269|PubMed:12362232"
MOD_RES 66
/note="4-carboxyglutamate"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00463,
ECO:0000269|PubMed:12362232"
MOD_RES 69
/note="4-carboxyglutamate"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00463"
MOD_RES 72
/note="4-carboxyglutamate"
/evidence="ECO:0000255|PROSITE-ProRule:PRU00463"
CARBOHYD 92
/note="O-linked (Hex...) serine"
/evidence="ECO:0000269|PubMed:15351847"
CARBOHYD 254
/note="N-linked (GlcNAc...) asparagine"
/evidence="ECO:0000269|PubMed:15351847"
DISULFID 57..62
/evidence="ECO:0000250"
DISULFID 90..101
/evidence="ECO:0000250|UniProtKB:P00742"
DISULFID 95..110
/evidence="ECO:0000250|UniProtKB:P00742"
DISULFID 112..121
/evidence="ECO:0000250|UniProtKB:P00742"
DISULFID 129..140
/evidence="ECO:0000269|PubMed:23869089,
ECO:0007744|PDB:4BXS, ECO:0007744|PDB:4BXW"
DISULFID 136..149
/evidence="ECO:0000269|PubMed:23869089,
ECO:0007744|PDB:4BXS, ECO:0007744|PDB:4BXW"
DISULFID 151..164
/evidence="ECO:0000269|PubMed:23869089,
ECO:0007744|PDB:4BXS, ECO:0007744|PDB:4BXW"
DISULFID 172..329
/note="Interchain (between light and heavy chains)"
/evidence="ECO:0000269|PubMed:23869089,
ECO:0007744|PDB:4BXS, ECO:0007744|PDB:4BXW"
DISULFID 216..221
/evidence="ECO:0000269|PubMed:23869089,
ECO:0007744|PDB:4BXS, ECO:0007744|PDB:4BXW"
DISULFID 236..252
/evidence="ECO:0000269|PubMed:23869089,
ECO:0007744|PDB:4BXS, ECO:0007744|PDB:4BXW"
DISULFID 377..391
/evidence="ECO:0000269|PubMed:23869089,
ECO:0007744|PDB:4BXS, ECO:0007744|PDB:4BXW"
DISULFID 402..430
/evidence="ECO:0000269|PubMed:23869089,
ECO:0007744|PDB:4BXS, ECO:0007744|PDB:4BXW"
CONFLICT 39
/note="K -> E (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 70
/note="V -> A (in Ref. 1; AAP86642)"
/evidence="ECO:0000305"
CONFLICT 142
/note="S -> H (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 185
/note="S -> N (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 193
/note="H -> Q (in Ref. 1; AAP86642 and 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 196
/note="T -> P (in Ref. 1; AAP86642)"
/evidence="ECO:0000305"
CONFLICT 200
/note="K -> I (in Ref. 1; AAP86642)"
/evidence="ECO:0000305"
CONFLICT 230..232
/note="DKK -> EKE (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 268..271
/note="RSRA -> KSRI (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 282
/note="V -> I (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 292..305
/note="KKSQEFYEKFDLVS -> QKAYKFDLAA (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 353..360
/note="GIFERGPN -> RIVEKGPK (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 379..388
/note="LSSNFPITPT -> VSSETPITPN (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 399
/note="Q -> R (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 411..413
/note="ITA -> TTV (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 426
/note="W -> S (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 433..438
/note="KGRYGI -> NGKYGN (in Ref. 8; AAT42490)"
/evidence="ECO:0000305"
CONFLICT 450..467
/note="Missing (in Ref. 1; AAP86642)"
/evidence="ECO:0000305"
TURN 128..132
/evidence="ECO:0007829|PDB:4BXS"
HELIX 133..135
/evidence="ECO:0007829|PDB:4BXW"
STRAND 137..141
/evidence="ECO:0007829|PDB:4BXW"
STRAND 144..146
/evidence="ECO:0007829|PDB:4BXS"
STRAND 148..150
/evidence="ECO:0007829|PDB:4BXW"
STRAND 155..157
/evidence="ECO:0007829|PDB:4BXW"
STRAND 164..168
/evidence="ECO:0007829|PDB:4BXW"
TURN 218..220
/evidence="ECO:0007829|PDB:4BXS"
STRAND 224..229
/evidence="ECO:0007829|PDB:4BXW"
TURN 230..232
/evidence="ECO:0007829|PDB:4BXW"
STRAND 233..240
/evidence="ECO:0007829|PDB:4BXW"
STRAND 242..248
/evidence="ECO:0007829|PDB:4BXW"
HELIX 250..252
/evidence="ECO:0007829|PDB:4BXW"
STRAND 253..257
/evidence="ECO:0007829|PDB:4BXW"
STRAND 260..264
/evidence="ECO:0007829|PDB:4BXW"
HELIX 268..273
/evidence="ECO:0007829|PDB:4BXW"
STRAND 279..285
/evidence="ECO:0007829|PDB:4BXW"
HELIX 291..295
/evidence="ECO:0007829|PDB:4BXW"
TURN 305..308
/evidence="ECO:0007829|PDB:4BXW"
STRAND 311..317
/evidence="ECO:0007829|PDB:4BXW"
HELIX 333..338
/evidence="ECO:0007829|PDB:4BXW"
HELIX 340..342
/evidence="ECO:0007829|PDB:4BXW"
STRAND 343..351
/evidence="ECO:0007829|PDB:4BXW"
STRAND 353..355
/evidence="ECO:0007829|PDB:4BXW"
STRAND 365..371
/evidence="ECO:0007829|PDB:4BXW"
HELIX 374..378
/evidence="ECO:0007829|PDB:4BXW"
STRAND 389..392
/evidence="ECO:0007829|PDB:4BXW"
STRAND 395..398
/evidence="ECO:0007829|PDB:4BXW"
STRAND 409..414
/evidence="ECO:0007829|PDB:4BXW"
STRAND 417..426
/evidence="ECO:0007829|PDB:4BXW"
STRAND 428..431
/evidence="ECO:0007829|PDB:4BXW"
STRAND 437..440
/evidence="ECO:0007829|PDB:4BXW"
HELIX 442..444
/evidence="ECO:0007829|PDB:4BXW"
HELIX 446..452
/evidence="ECO:0007829|PDB:4BXW"
SEQUENCE 467 AA; 52215 MW; C773D41DB08F9844 CRC64;
MAPQLLLCLI LTFLWSLPEA ESNVFLKSKV ANRFLQRTKR ANSLVEEFKS GNIERECIEE
RCSKEEAREV FEDDEKTETF WNVYVDGDQC SSNPCHYRGI CKDGIGSYTC TCLSGYEGKN
CERVLYKSCR VDNGNCWHFC KSVQNDIQCS CAEGYLLGED GHSCVAGGNF SCGRNIKTRN
KREASLPDFV QSHNATLLKK SDNPSPDIRI VNGMDCKLGE CPWQAALVDD KKGVFCGGTI
LSPIYVLTAA HCINETETIS VVVGEIDRSR AETGPLLSVD KVYVHKKFVP PKKSQEFYEK
FDLVSYDYDI AIIQMKTPIQ FSENVVPACL PTADFANQVL MKQDFGIVSG FGGIFERGPN
SKTLKVLKVP YVDRHTCMLS SNFPITPTMF CAGYDTLPQD ACQGDSGGPH ITAYRDTHFI
TGIVSWGEGC ARKGRYGIYT KLSKFIPWIK RIMRQKLPST ESSTGRL