PDB-7lo2: S-adenosylmethionine synthetase cocrystallized with CTP

ID or keywords:

Entry

Database: PDB / ID: 7lo2

Title

S-adenosylmethionine synthetase cocrystallized with CTP

Components

S-adenosylmethionine synthase

Keywords

TRANSFERASE / S-adenosylmethionine synthetase

Function / homology

Function and homology information

methionine adenosyltransferase / methionine adenosyltransferase activity / S-adenosylmethionine biosynthetic process / one-carbon metabolic process / magnesium ion binding / ATP binding / cytoplasm
Similarity search - Function

Biological species

Escherichia coli 908573 (bacteria)

Method

X-RAY DIFFRACTION /

SYNCHROTRON /

MOLECULAR REPLACEMENT / Resolution: 1.89 Å

Authors

Tan, L.L. / Jackson, C.J.

Citation

Journal: Jacs Au / Year: 2021
Title: Substrate Dynamics Contribute to Enzymatic Specificity in Human and Bacterial Methionine Adenosyltransferases.
Authors: Gade, M. / Tan, L.L. / Damry, A.M. / Sandhu, M. / Brock, J.S. / Delaney, A. / Villar-Briones, A. / Jackson, C.J. / Laurino, P.

History

Deposition	Feb 9, 2021	Deposition site: RCSB / Processing site: RCSB
Revision 1.0	Mar 31, 2021	Provider: repository / Type: Initial release
Revision 1.1	Mar 2, 2022	Group: Database references / Category: citation / citation_author / database_2 Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _database_2.pdbx_DOI / _database_2.pdbx_database_accession
Revision 1.2	Oct 18, 2023	Group: Data collection / Refinement description Category: chem_comp_atom / chem_comp_bond / pdbx_initial_refinement_model

Structure viewer	Molecule: MolmilJmol/JSmol

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Download

PDBx/mmCIF format	7lo2.cif.gz	727 KB	Display	PDBx/mmCIF format
PDB format	pdb7lo2.ent.gz	501.6 KB	Display	PDB format
PDBx/mmJSON format	7lo2.json.gz		Tree view	PDBx/mmJSON format
Others	Other downloads

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Validation report

Arichive directory	https://data.pdbj.org/pub/pdb/validation_reports/lo/7lo2 ftp://data.pdbj.org/pub/pdb/validation_reports/lo/7lo2	HTTPS FTP

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Related structure data

Related structure data	7ll3C 7lnhC 7lnnC 7looC 7lowC 7lozC 1pl7S S: Starting model for refinement C: citing same article (ref.)
Similar structure data	7ll3-1 1mxc-2 7lnn-1 1mxb-2 7low-1 6rkc-1 5xf9-1 3so4-d 7loz-1 5a1i-1 Search similar-shape structures by Omokage search (details) Similarity search - Function & homologyF&H Search Similarity search - FunctionF&H Search Similarity search - HomologyF&H Search

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Links

PDB pages	PDBj / wwPDB / NCBI
Related items in Molecule of the Month	#151 - Jul 2012 Hypoxanthine-guanine phosphoribosyltransferase similarity (1) #106 - Oct 2008 Poly(A) Polymerase similarity (1) #116 - Aug 2009 Sulfotransferases similarity (1) #226 - Oct 2018 Aminoglycoside Antibiotics and Resistance similarity (1) #249 - Sep 2020 SARS-CoV-2 RNA-dependent RNA Polymerase similarity (1)

Deposited unit

A: S-adenosylmethionine synthase

B: S-adenosylmethionine synthase

C: S-adenosylmethionine synthase

D: S-adenosylmethionine synthase

hetero molecules

171 kDa, 4 polymers
Search similar-shape structures of this assembly by Omokage search (details)

1

Idetical with deposited unit
defined by author&software
Evidence: gel filtration

Unit cell

Length a, b, c (Å)	100.139, 118.320, 144.456
Angle α, β, γ (deg.)	90.000, 90.000, 90.000
Int Tables number	19
Space group name H-M	P2₁2₁2₁
Space group name Hall	P2ac2ab
Symmetry operation	#1: x,y,z #2: x+1/2,-y+1/2,-z #3: -x,y+1/2,-z+1/2 #4: -x+1/2,-y,z+1/2

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Protein , 1 types, 4 molecules ABCD

#1: Protein	S-adenosylmethionine synthase / AdoMet synthase / MAT / Methionine adenosyltransferase Mass: 41998.508 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Escherichia coli 908573 (bacteria) / Gene: metK, HMPREF1611_00479 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: V0ZE41, methionine adenosyltransferase

#1: Protein

S-adenosylmethionine synthase / AdoMet synthase / MAT / Methionine adenosyltransferase

Mass: 41998.508 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.)

Escherichia coli 908573 (bacteria) / Gene: metK, HMPREF1611_00479 / Production host:

Escherichia coli BL21(DE3) (bacteria) / References: UniProt: V0ZE41, methionine adenosyltransferase

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Non-polymers , 7 types, 670 molecules

#2: Chemical	ChemComp-MG / MAGNESIUM ION Mass: 24.305 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: Mg
#3: Chemical	ChemComp-PO4 / PHOSPHATE ION Mass: 94.971 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: PO₄
#4: Chemical	ChemComp-POP / PYROPHOSPHATE 2- Mass: 175.959 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: H₂O₇P₂ / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical	ChemComp-EDO / 1,2-ETHANEDIOL / ETHYLENE GLYCOL Mass: 62.068 Da / Num. of mol.: 17 / Source method: obtained synthetically / Formula: C₂H₆O₂
#6: Chemical	ChemComp-K / POTASSIUM ION Mass: 39.098 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: K
#7: Chemical	ChemComp-PG4 / TETRAETHYLENE GLYCOL Mass: 194.226 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C₈H₁₈O₅ / Comment: precipitant*YM
#8: Water	ChemComp-HOH / water Mass: 18.015 Da / Num. of mol.: 633 / Source method: isolated from a natural source / Formula: H₂O

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Details

Has ligand of interest	Y

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Experiment

Experiment	Method: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

Crystal	Density Matthews: 2.55 Å³/Da / Density % sol: 51.71 %
Crystal grow	Temperature: 292.15 K / Method: vapor diffusion, hanging drop Details: 8% PEG 8000, 0.1 M Bis-Tris pH 6.5, 20% ethylene glycol

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Data collection

Diffraction	Mean temperature: 100 K / Serial crystal experiment: N
Diffraction source	Source: SYNCHROTRON / Site: Australian Synchrotron / Beamline: MX2 / Wavelength: 0.9537 Å
Detector	Type: DECTRIS EIGER X 16M / Detector: PIXEL / Date: Aug 28, 2020
Radiation	Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelength	Wavelength: 0.9537 Å / Relative weight: 1
Reflection	Resolution: 1.89→39.44 Å / Num. obs: 137355 / % possible obs: 99.9 % / Redundancy: 7.5 % / B_iso Wilson estimate: 33.74 Å² / CC_1/2: 0.999 / Net I/σ(I): 13.8
Reflection shell	Resolution: 1.89→1.92 Å / Mean I/σ(I) obs: 0.8 / Num. unique obs: 6706 / CC_1/2: 0.412

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Processing

Software

Name	Version	Classification
PHENIX	1.18.2_3874	refinement
PHENIX	1.18.2_3874	refinement
XDS		data reduction
SCALA		data scaling
PHASER		phasing

Refinement

Method to determine structure:

MOLECULAR REPLACEMENT
Starting model: 1PL7

1pl7

Resolution: 1.89→38.22 Å / SU ML: 0.227 / Cross valid method: FREE R-VALUE / σ(F): 1.33 / Phase error: 21.9672
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2

	R_factor	Num. reflection	% reflection
R_free	0.1951	6977	5.08 %
R_work	0.1659	130239	-
obs	0.1674	137216	99.86 %

Solvent computation

Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL

Displacement parameters

B_iso mean: 46.14 Å²

Refinement step

Cycle: LAST / Resolution: 1.89→38.22 Å

	Protein	Nucleic acid	Ligand	Solvent	Total
Num. atoms	11548	0	148	633	12329

Refine LS restraints

Refine-ID	Type	Dev ideal	Number
X-RAY DIFFRACTION	f_bond_d	0.0103	12030
X-RAY DIFFRACTION	f_angle_d	1.0406	16305
X-RAY DIFFRACTION	f_chiral_restr	0.0696	1809
X-RAY DIFFRACTION	f_plane_restr	0.0067	2127
X-RAY DIFFRACTION	f_dihedral_angle_d	17.2448	4418

LS refinement shell

Resolution (Å)	R_factor R_free	Num. reflection R_free	R_factor R_work	Num. reflection R_work	Refine-ID	% reflection obs (%)
1.89-1.91	0.3871	214	0.357	4279	X-RAY DIFFRACTION	99.51
1.91-1.93	0.3747	234	0.311	4260	X-RAY DIFFRACTION	99.82
1.93-1.96	0.302	216	0.2831	4306	X-RAY DIFFRACTION	99.82
1.96-1.98	0.3078	222	0.2805	4314	X-RAY DIFFRACTION	99.93
1.98-2.01	0.2994	229	0.25	4335	X-RAY DIFFRACTION	99.98
2.01-2.04	0.2962	224	0.2405	4309	X-RAY DIFFRACTION	99.93
2.04-2.07	0.2462	223	0.225	4280	X-RAY DIFFRACTION	99.96
2.07-2.1	0.2631	255	0.2134	4343	X-RAY DIFFRACTION	100
2.1-2.13	0.2371	244	0.1967	4263	X-RAY DIFFRACTION	99.93
2.13-2.16	0.23	219	0.194	4306	X-RAY DIFFRACTION	99.98
2.16-2.2	0.2479	222	0.1836	4328	X-RAY DIFFRACTION	99.98
2.2-2.24	0.2155	216	0.1775	4303	X-RAY DIFFRACTION	99.96
2.24-2.28	0.2276	237	0.1761	4354	X-RAY DIFFRACTION	99.98
2.28-2.33	0.2382	216	0.1779	4350	X-RAY DIFFRACTION	99.93
2.33-2.38	0.2111	236	0.1735	4305	X-RAY DIFFRACTION	99.91
2.38-2.44	0.2006	231	0.1654	4304	X-RAY DIFFRACTION	99.98
2.44-2.5	0.2183	238	0.1648	4341	X-RAY DIFFRACTION	99.96
2.5-2.56	0.2173	248	0.1648	4304	X-RAY DIFFRACTION	99.98
2.56-2.64	0.1953	237	0.1594	4325	X-RAY DIFFRACTION	99.98
2.64-2.73	0.2052	234	0.1569	4326	X-RAY DIFFRACTION	100
2.73-2.82	0.1902	230	0.1564	4373	X-RAY DIFFRACTION	99.96
2.82-2.94	0.2159	243	0.1642	4324	X-RAY DIFFRACTION	99.98
2.94-3.07	0.2144	229	0.1671	4371	X-RAY DIFFRACTION	99.98
3.07-3.23	0.2213	200	0.1752	4402	X-RAY DIFFRACTION	99.98
3.23-3.43	0.2046	226	0.1634	4382	X-RAY DIFFRACTION	99.93
3.43-3.7	0.1665	275	0.1531	4337	X-RAY DIFFRACTION	99.81
3.7-4.07	0.1683	238	0.1413	4384	X-RAY DIFFRACTION	99.68
4.07-4.66	0.1442	237	0.1286	4405	X-RAY DIFFRACTION	99.68
4.66-5.87	0.1622	244	0.1411	4444	X-RAY DIFFRACTION	99.49
5.87-38.22	0.1646	260	0.1629	4582	X-RAY DIFFRACTION	98.86

Refinement TLS params.

Method: refined / Refine-ID: X-RAY DIFFRACTION

ID	L11 (°²)	L12 (°²)	L13 (°²)	L22 (°²)	L23 (°²)	L33 (°²)	S11 (Å °)	S12 (Å °)	S13 (Å °)	S21 (Å °)	S22 (Å °)	S23 (Å °)	S31 (Å °)	S32 (Å °)	S33 (Å °)	T11 (Å²)	T12 (Å²)	T13 (Å²)	T22 (Å²)	T23 (Å²)	T33 (Å²)	Origin x (Å)	Origin y (Å)	Origin z (Å)
1	1.14048065466	-0.0386862626101	1.31157991615	2.03207747468	-1.15875585107	2.22463752122	0.360943081251	0.714146989132	0.260901133733	-0.82916541367	-0.143635394129	-0.132372316939	-0.574286516944	-0.488773307673	0.122658369014	0.63331550556	0.15253272453	0.0252716178091	0.678826534176	0.103816542164	0.259212843523	41.2663606507	18.7415675935	-13.9082179547
2	4.8292292307	-0.036520640936	-0.321966163916	1.29561186641	-0.270171651444	2.16560637313	-0.090761540328	0.00896738497576	0.133635627991	0.0681053102373	-0.057755131873	-0.111991116736	-0.201696210154	0.134653962804	0.118713888114	0.234234244941	-0.0327240759086	-0.0229350474072	0.159212399894	-0.00327236033426	0.20790730502	68.519994429	-0.649497531061	29.4074597116
3	1.24531137261	-1.48119169229	1.26052731663	1.94744916848	-1.28566268675	2.00999122713	-0.122380564068	0.0415859684433	0.135413057134	0.2056901411	0.0306975853922	-0.156168531811	-0.161257810661	0.0858020067108	0.0831398124676	0.215628762821	-0.0474768285364	0.012066145678	0.256903064476	-0.0269181868409	0.229906053793	72.3699042249	-6.46572109614	32.230142938
4	1.84572664939	1.17546294327	0.273190666293	0.87209408437	0.448716835012	1.73520899412	-0.453732397465	0.605555401472	0.789381806428	0.13094185387	-0.161339133423	-0.432714784638	-0.721658262068	0.727908764896	0.394674902475	0.49742646945	-0.27445102662	-0.176400882974	0.598148082628	0.219788689199	0.683793676437	90.5741643269	10.4212044527	27.0946880687
5	1.46494547995	-0.596206791546	0.919546861733	1.24610555607	-0.105006021114	1.79483374232	-0.0154844566959	0.126550779458	0.101269184706	0.0708923699851	-0.0625381134586	-0.278672425372	-0.0297917010614	0.369907094689	0.0822359364293	0.204022076411	-0.02284397115	-0.000176236313684	0.279210878165	0.0141304862183	0.274846051113	83.5963808573	-15.3204262968	35.2673256308
6	7.61701442084	-4.85167184809	2.88226342024	8.18814909613	-2.13467421404	5.35109439171	-0.350452619251	-0.316992542845	-0.229467543542	0.260154081587	0.339357127631	-0.0928493834264	0.136685828894	0.00542609745492	-0.0102433932685	0.277097243124	-0.043653099402	-0.00858544866582	0.2327732737	0.00767246807758	0.232950868359	81.3066636407	-22.3581626584	46.0451971473
7	2.2810680657	-0.797018660526	0.684348039079	3.30880726744	-0.765213237834	2.39578047743	-0.240856285143	-0.15690291515	0.3240638905	0.281440936234	-0.00799758189242	-0.433743061243	-0.217335704697	0.400764807532	0.309573580481	0.285020656267	-0.0545574770893	-0.0755000930107	0.307928784271	-0.0291282936887	0.272274302057	82.0621323795	-8.18950162404	45.2910171031
8	1.7762980459	-1.02621414037	0.716058705832	3.11038166364	-1.65087285799	2.64888894095	0.061420538884	0.329598818626	0.215687828309	-0.243268735317	-0.246825461459	-0.212890448181	-0.0389031070818	0.409500325822	0.174156083441	0.241406796447	-0.00590321098001	0.0533660768237	0.321160148481	-0.0176485167799	0.243933065876	73.8559538538	-11.4751009292	10.5185518923
9	4.64320466216	0.842874010539	-0.610966911253	1.88490171708	-0.398824750114	1.50328902834	0.0626666895779	0.413172562593	0.177705008841	-0.252794981579	-0.131940559687	0.0611022354183	-0.0658699472982	0.284904458359	0.0714641208294	0.350727054553	0.0266791025947	0.0459737956291	0.393143279786	0.0230211090667	0.12067217913	69.6291513066	-9.67273629675	6.70349980066
10	2.96699595008	0.38632428492	0.73286191039	2.02342730545	-0.428124025208	1.83860278609	0.0829168163875	0.354324405079	-0.35176551501	-0.364979308542	-0.0538964979869	-0.326713969763	0.274399392141	0.431474028853	-0.0348105946868	0.37091830346	0.0913990676059	0.053103962241	0.299404680153	-0.0583074248596	0.277695743497	78.894639106	-28.6082894354	17.395277874
11	4.44522633067	-1.239081669	1.60789456245	3.98902626784	-0.609022504445	3.04316228454	0.306407087327	-0.0556426665129	-0.400817126961	-0.144164710018	-0.108165353699	0.0105850675766	0.442357601288	0.0392201113922	-0.198543238253	0.364779365941	-0.000207738955074	0.0149027028395	0.222830708362	-0.0525922111114	0.243619200749	71.2358166302	-34.109924559	23.9522256045
12	2.32285959394	-0.119226361882	-0.0483409387174	1.34999570794	-0.710479505283	2.29363774244	-0.0208273222755	0.29478153824	0.111750376002	-0.0269812769308	-0.174817855758	-0.494935749708	-0.0681754850256	0.902529441713	0.162524431674	0.294655463518	-0.0095248282358	0.0582251171831	0.639722064819	0.0466969323789	0.409382017204	92.8764521238	-14.4660935139	16.4746818364
13	8.32134861684	0.473304816854	-2.26993120338	5.1631936309	0.0473165047343	2.89022749952	0.391321263429	0.470156586102	0.482055300907	-0.129726985278	-0.754170150342	-1.03033532013	-0.0729739367152	1.500066507	0.32838699726	0.406753713008	-0.0401351678389	0.146360638587	1.00927706733	0.212582582067	0.658052565489	101.885969404	-11.6440384883	8.55652603022
14	4.48929674465	-1.32189891553	-0.948478330472	1.80569762579	0.862163825547	0.478752630043	-0.0471826918971	0.351379375537	-0.365338480929	-0.447524583122	-0.155126277606	-0.420224323215	0.397689903434	0.63534079703	0.106843126765	0.420770700737	0.127400267982	0.179925780504	0.74706675821	0.0075405369814	0.464575126504	91.3857347867	-21.0224118371	6.10408053149
15	1.99660329585	-0.244667922254	0.414596157186	1.62059097712	0.68460082083	2.65337021774	-0.0637127367667	0.0437404237992	-0.165416129527	-0.0106134111145	0.0525957891321	0.0648319207952	0.127628243789	0.0438605669418	-0.0026097990315	0.225890363873	-0.0364363873912	0.0154445910217	0.18852908403	-0.00886226438987	0.242668343214	42.3181466577	-3.48389444446	17.8639983566
16	8.65431562181	-7.34650593505	1.69478857032	6.15115513893	-1.44346953439	0.293389405402	-1.26448297752	-1.31009089192	1.24224658505	1.22932320635	1.46401046007	-0.897794694022	-0.203083614398	0.244840253675	-0.0115849618766	0.460996305491	0.0426155158056	0.0290109318623	0.39965399573	-0.017038962557	0.460523013847	45.0073583753	11.9646046058	29.9124352226
17	2.08411711162	-0.684403777884	0.38019405899	1.53495962664	-0.120519567793	0.845110612719	0.148504349883	0.256311402053	-0.414702571171	-0.250836590575	-0.0741936529139	0.421895610449	0.125401835493	-0.135714252881	0.00659033184929	0.251744004093	-0.0508296499296	-0.0643155470945	0.274187962992	-0.0422239422922	0.327752249267	25.3042234006	3.27533891954	10.5830391283
18	3.14699271969	-1.27733971347	-0.609043754391	2.72580957824	0.517507790747	1.49802226511	0.164253722504	0.354481958196	-0.112165771425	-0.319036382211	-0.18153178034	-0.116049733081	0.0353640632817	0.00751549097245	0.0225829108725	0.279702595045	-0.0217795880179	0.0122238078599	0.273756246483	0.0276378385824	0.159787884572	51.4351443957	9.09160186654	1.03304105147
19	3.54920911733	0.427306104082	2.13337809277	1.72935588881	0.619698392419	3.88118495212	0.201644744208	0.53456963346	-0.229434215633	-0.279743301469	-0.167429164039	-0.330296802315	0.282385388293	0.228033199456	-0.01295767773	0.337600338837	0.0328684519455	0.0956993632425	0.368279414501	0.0238957921709	0.241208612917	56.2988582088	7.64611486324	1.36859104792
20	2.39579999111	-0.396911567977	-0.163545022294	2.00782659597	0.430716517066	1.6477296365	0.0989192197296	0.332930728474	0.259435324821	-0.289333366786	-0.166486136129	0.13028697387	-0.137206403543	-0.207150677001	0.0869221055669	0.30909079028	0.0156176953274	0.0274802479716	0.27913384646	0.0686709369204	0.232544471066	38.6238507397	23.0251999792	1.73938958939
21	3.9658893809	0.640593482672	3.35069348197	4.88285217955	-0.677306392662	6.9030444666	0.307708331816	0.896140508474	-0.139441556092	-0.879128707512	-0.340791947801	0.533492206928	0.239738795709	-0.717921340551	0.0547608099105	0.697798773394	0.0915575612226	-0.140957740493	0.992628551075	-0.169564059675	0.383573687039	31.5585402678	9.74222508232	-19.6948672065

Refinement TLS group

Refine-ID: X-RAY DIFFRACTION

ID	Refine TLS-ID	Selection details	Auth asym-ID	Label asym-ID	Auth seq-ID	Label seq-ID
1	1	chain 'B' and (resid 345 through 382 )	B	B	345 - 382	338 - 375
2	2	chain 'C' and (resid 3 through 75 )	C	C	3 - 75	1 - 74
3	3	chain 'C' and (resid 76 through 135 )	C	C	76 - 135	75 - 128
4	4	chain 'C' and (resid 136 through 238 )	C	C	136 - 238	129 - 232
5	5	chain 'C' and (resid 239 through 321 )	C	C	239 - 321	233 - 318
6	6	chain 'C' and (resid 322 through 344 )	C	C	322 - 344	319 - 341
7	7	chain 'C' and (resid 345 through 383 )	C	C	345 - 383	342 - 380
8	8	chain 'D' and (resid 1 through 63 )	D	D	1 - 63	1 - 63
9	9	chain 'D' and (resid 64 through 119 )	D	D	64 - 119	64 - 111
10	10	chain 'D' and (resid 120 through 172 )	D	D	120 - 172	112 - 165
11	11	chain 'D' and (resid 173 through 239 )	D	D	173 - 239	166 - 233
12	12	chain 'D' and (resid 240 through 321 )	D	D	240 - 321	234 - 315
13	13	chain 'D' and (resid 322 through 344 )	D	D	322 - 344	316 - 338
14	14	chain 'D' and (resid 345 through 383 )	D	D	345 - 383	339 - 377
15	15	chain 'A' and (resid 3 through 89 )	A	A	3 - 89	1 - 87
16	16	chain 'A' and (resid 90 through 110 )	A	A	90 - 110	88 - 109
17	17	chain 'A' and (resid 111 through 383 )	A	A	111 - 383	110 - 386
18	18	chain 'B' and (resid 3 through 63 )	B	B	3 - 63	1 - 61
19	19	chain 'B' and (resid 64 through 119 )	B	B	64 - 119	62 - 109
20	20	chain 'B' and (resid 120 through 321 )	B	B	120 - 321	110 - 314
21	21	chain 'B' and (resid 322 through 344 )	B	B	322 - 344	315 - 337

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